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Spirit Airlines

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FY2017 Annual Report · Spirit Airlines
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K 

(Mark One)

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF
1934

For the fiscal year ended December 31, 2017 

or

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT
OF 1934

For the transition period from             to            

Commission File No. 001-35186 

Spirit Airlines, Inc. 

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction of
incorporation or organization)

2800 Executive Way
Miramar, Florida
(Address of principal executive offices)

38-1747023
(I.R.S. Employer
Identification No.)

33025
(Zip Code)

(954) 447-7920
(Registrant’s telephone number, including area code) 

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class
Voting Common Stock, $0.0001 par value
Non-Voting Common Stock, $0.0001 par value

Name of Each Exchange on Which Registered
New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:
None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  

    No  

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  

    No  

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 

during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing 
requirements for the past 90 days.    Yes  

    No  

Indicate by checkmark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required 

to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required 
to submit and post such files).    Yes  

    No  

 
  
 
 
 
 
 
 
 
 
 
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the 
best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this 
Form 10-K.  

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an 

emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and "emerging growth company" in 
Rule 12b-2 of the Exchange Act.

Large accelerated filer  

     Accelerated filer    

      Non-accelerated filer   

     Smaller reporting company  

Emerging growth company   

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new 

or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.  

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  

    No  

The aggregate market value of the common stock held by non-affiliates of the registrant was approximately $3.6 billion computed by reference to the last 
sale price of the common stock on the NASDAQ Global Select Market on June 30, 2017, the last trading day of the registrant’s most recently completed second 
fiscal quarter. Shares held by each executive officer, director and by certain persons that own 10 percent or more of the outstanding Common Stock have been 
excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other 
purposes.

The number of shares of each registrant's classes of common stock outstanding as of the close of business on February 6, 2018: 

Class

Number of Shares

Common Stock, $0.0001 par value per share

68,213,030

Documents Incorporated by Reference

Portions of the registrant's Proxy Statement for the registrant's 2018 Annual Meeting of Stockholders are incorporated by reference into Part III of this 

Form 10-K to the extent stated herein.  The Proxy Statement will be filed within 120 days of the registrant's fiscal year ended December 31, 2017.

TABLE OF CONTENTS

PART I
Item 1. Business . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 1A. Risk Factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 1B. Unresolved Staff Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 2. Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 3. Legal Proceedings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 4. Mine Safety Disclosures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity 
Securities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 6. Selected Financial Data  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations . . . . . . . . . . . . . . . . . .
Item 7A. Quantitative and Qualitative Disclosures About Market Risk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 8. Financial Statements and Supplementary Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure . . . . . . . . . . . . . . . . .
Item 9A. Controls and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 9B. Other Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PART III
Item 10. Directors, Executive Officers and Corporate Governance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 11. Executive Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters . . . . . . .
Item 13. Certain Relationships and Related Transactions and Director Independence . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Item 14. Principal Accountant Fees and Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PART IV
Item 15. Exhibits and Financial Statement Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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__________________________________________________ 

 
 
 
ITEM 1. 

BUSINESS

Overview

PART I

Spirit Airlines is an ultra low-cost, low-fare airline that offers affordable travel to price-conscious customers. Our all-
Airbus Fit FleetTM, the youngest fleet of any major U.S. airline, currently operates more than 450 daily flights to 60 destinations 
in the United States, Caribbean and Latin America. Our stock trades on the New York Stock Exchange (NYSE) under the 
symbol "SAVE," effective as of December 28, 2017. Prior to this date, our stock traded on the NASDAQ Global Select Stock 
Market (NASDAQ) under the symbol "SAVE."

Our ultra low-cost carrier, or ULCC, business model allows us to compete principally by offering customers our Bare 
Fares TM, which are unbundled base fares that remove components traditionally included in the price of an airline ticket. We 
then give customers Frill Control TM, which provides customers the freedom to save by paying only for the options they choose 
such as bags, advance seat assignments and refreshments. We record revenue related to these options in our financial statements 
as non-ticket revenue. 

Our History and Corporate Information

We were founded in 1964 as Clippert Trucking Company, a Michigan corporation. We began air charter operations in 
1990 and renamed ourselves Spirit Airlines, Inc. in 1992. In 1994, we reincorporated in Delaware, and in 1999 we relocated our 
headquarters to Miramar, Florida.

Our mailing address and executive offices are located at 2800 Executive Way, Miramar, Florida 33025, and our telephone 

number at that address is (954) 447-7920. We are subject to the information and periodic reporting requirements of the 
Securities Exchange Act of 1934, or Exchange Act, and, in accordance therewith, file periodic reports, proxy statements and 
other information with the Securities and Exchange Commission or SEC. Such periodic reports, proxy statements and other 
information are available for inspection and copying at the SEC's Public Reference Room at 100 F Street, NE., Washington, 
DC 20549 or may be obtained by calling the SEC at 1-800-SEC-0330. In addition, the SEC maintains a website at http://
www.sec.gov that contains reports, proxy statements and other information regarding issuers that file electronically with the 
SEC. We also post on the Investor Relations page of our website, www.spirit.com, a link to our filings with the SEC, our 
Corporate Governance Guidelines and Code of Business Conduct and Ethics, which applies to all directors and all our 
employees, and the charters of our Audit, Compensation, Finance, Safety, Security and Operations and Nominating and 
Corporate Governance committees. Our filings with the SEC are posted as soon as reasonably practical after they are filed 
electronically with the SEC. Please note that information contained on our website is not incorporated by reference in, or 
considered to be a part of, this report. You can also obtain copies of these documents free of charge by writing to us at: 
Corporate Secretary, Spirit Airlines, Inc., 2800 Executive Way, Miramar, Florida 33025.

Our Business Model

Our ULCC business model provides customers low, unbundled base fares with a range of optional services, allowing 
customers the freedom to choose only the options they value. The success of our model is driven by our low-cost structure, 
which permits us to offer low base fares while maintaining high profit margins.

We are focused on price-sensitive travelers who pay for their own travel, and our business model is designed to deliver 
what we believe our customers want: low fares. We aggressively use low fares to address an underserved market, which helps 
us to increase passenger volume, load factors and non-ticket revenue on the flights we operate. We also have high-density 
seating configurations on our aircraft and a simplified onboard product designed to lower costs, which is part of our Plane 
SimpleTM strategy. High passenger volumes and load factors help us sell more ancillary products and services, which in turn 
allows us to reduce the base fare we offer even further. We strive to be recognized by our customers and potential customers as 
the low-fare leader in the markets we serve.

We compete based on total price. We believe other airlines have used an all-inclusive price concept to effectively maintain 

higher total prices to consumers, rather than lowering fares by unbundling each product or service. For example, carriers that 
tout “free bags” have included the cost of checking bags in the total ticket price, which does not allow passengers to see how 
much they would save if they did not check luggage. We believe that we and our customers benefit when we allow our 
customers to know the total price of their travel by breaking out the cost of optional products or services. 

We allow our customers to see all available options and their respective prices prior to purchasing a ticket, and this full 

transparency illustrates that our total price, including options selected, is lower than other airlines on average. Through branded 

4

campaigns, we educate the public on how our unbundled pricing model works and show them how it gives them a choice on 
how they spend their money and saves them money compared to other airlines. 

Our Strengths

We believe we compete successfully in the airline industry by leveraging the following demonstrated business strengths:

Ultra Low-Cost Structure. Our unit operating costs are among the lowest of all airlines operating in the United States. 
We believe this unit cost advantage helps protect our market position and enables us to offer some of the lowest base fares in 
our markets, sustain among the highest operating margins in our industry and support continued growth. Our operating costs 
per available seat mile (CASM) of 7.63 cents in 2017 were significantly lower than those of the major domestic network 
carriers and among the lowest of the domestic low-cost carriers. We achieve these low unit operating costs in large part due to:

• 

• 

high aircraft utilization;

high-density seating configurations on our aircraft, which is part of our Plane Simple TM strategy along with simplified 
onboard product designed to lower costs;

•  minimal hub-and-spoke network inefficiencies;

• 

• 

• 

• 

• 

• 

highly productive workforce;

opportunistic outsourcing of operating functions;

operating our Fit Fleet TM, a single-fleet type of Airbus A320-family aircraft that is the youngest fleet of any major 
U.S. airline and operated by common flight crews;

reduced sales, marketing and distribution costs through direct-to-consumer marketing;

efficient flight scheduling, including minimal ground times between flights; and

a company-wide business culture that is keenly focused on driving costs lower.

Innovative Revenue Generation. We execute our innovative, unbundled pricing strategy to generate significant non-
ticket revenue, which allows us to lower base fares and enables our passengers to identify, select and pay for only the products 
and services they want to use. In implementing our unbundled strategy, we have grown average non-ticket revenue per 
passenger flight segment from approximately $5 in 2006 to $53 in 2017 by:

• 

• 

• 

charging for checked and carry-on baggage;

passing through all distribution-related expenses;

charging for premium seats and advance seat selection;

•  maintaining consistent ticketing policies, including service charges for changes and cancellations;

• 

• 

• 

• 

• 

generating subscription revenue from our $9 Fare Club low-fare subscription service;

deriving brand-based revenues from proprietary services, such as our FREE SPIRIT affinity credit card program;

offering third-party travel products (travel packages), such as hotel rooms, ground transportation (rental and hotel 
shuttle products) and attractions (show or theme park tickets) packaged with air travel on our website;

selling third-party travel insurance through our website; and

selling onboard advertising.

Resilient Business Model and Customer Base. By focusing on price-sensitive travelers, we have maintained profitability 

during volatile economic periods because we are not highly dependent on premium-fare business traffic. We believe our 
growing customer base is more resilient than the customer bases of most other airlines because our low fares and unbundled 
service offering appeal to price-sensitive travelers.

Well Positioned for Growth. We have developed a substantial network of destinations in profitable U.S. domestic niche 

markets, targeted growth markets in the Caribbean and Latin America and high-volume routes flown by price-sensitive 
travelers. In the United States, we also have grown into large markets that, due to higher fares, have priced out those more 
price-sensitive travelers. We seek to balance growth between large domestic markets, niche markets and opportunities in the 
Caribbean and Latin America according to current economic and industry conditions.

Experienced International Operator. We believe we have substantial experience in foreign local aviation, security and 

customs regulations, local ground operations and flight crew training required for successful international and overwater flight 

5

operations. All of our aircraft are certified for overwater operations. We believe we compete favorably against other low-cost 
carriers because we have been conducting international flight operations since 2003 and have developed substantial experience 
in complying with the various regulations and business practices in the international markets we serve. During 2017, 2016 and 
2015, no revenue from any one foreign country represented greater than 4% of our total passenger revenue. We attribute 
operating revenues by geographic region based upon the origin and destination of each passenger flight segment.

Financial Strength Achieved with Focus on Cost Discipline. We believe our ULCC business model has delivered strong 

financial results in both favorable and more difficult economic times. We have generated these results by:

• 

• 

• 

keeping a consistent focus on maintaining low unit operating costs;

ensuring our sourcing arrangements with key third parties are regularly benchmarked against the best industry 
standards; 

generating and maintaining an adequate level of liquidity to insulate against volatility in key cost inputs, such as fuel, 
and in passenger demand that may occur as a result of changing general economic conditions.

Route Network

As of December 31, 2017, our route network included 237 markets served by 60 airports throughout North America, 

Central America, South America and the Caribbean. 

Below is a route map of our current network, which includes seasonal routes and routes announced as of January 11, 

2018 for which service has not yet started:

6

Our network expansion targets underserved and/or overpriced markets. We employ a rigorous process to identify 

opportunities to deploy new aircraft where we believe they will be most profitable. To monitor the profitability of each route, 
we analyze weekly and monthly profitability reports as well as near-term forecasting.

Competition

The airline industry is highly competitive. The principal competitive factors in the airline industry are fare pricing, total 
price, flight schedules, aircraft type, passenger amenities, number of routes served from a city, customer service, safety record 
and reputation, code-sharing relationships and frequent flier programs and redemption opportunities. Our competitors and 
potential competitors include traditional network airlines, other low-cost carriers and ULCCs, and regional airlines. We 
typically compete in markets served by traditional network airlines, and other low-cost carriers and ULCCs, and, to a lesser 
extent, regional airlines. 

As of December 31, 2017, our top two largest network overlaps are with Southwest Airlines and American Airlines at 
approximately 62% and 51% of our markets, respectively. Our principal competitors on domestic routes are Southwest Airlines, 
American Airlines, Delta Air Lines and United Airlines. Our principal competitors to our markets in the Caribbean and Latin 
America are American Airlines, JetBlue Airways, Southwest Airlines and United Airlines. Our principal competitive advantage 
is our relative cost advantage which allows us to offer low base fares profitably. In 2017, our unit operating costs were among 
the lowest in the U.S. airline industry. In difficult economic or competitive environments, we believe our low unit costs coupled 
with our relatively stable non-ticket revenues allow us to price our fares at levels where we can be profitable while our primary 
competitors cannot. 

The airline industry is particularly susceptible to price discounting because, once a flight is scheduled, airlines incur only 

nominal incremental costs to provide service to passengers occupying otherwise unsold seats. The expenses of a scheduled 
aircraft flight do not vary significantly with the number of passengers carried and, as a result, a relatively small change in the 
number of passengers or in pricing could have a disproportionate effect on an airline’s operating and financial results. Price 
competition occurs on a market-by-market basis through price discounts, changes in pricing structures, fare matching, target 
promotions and frequent flier initiatives. Airlines typically use discount fares and other promotions to stimulate traffic during 
normally slower travel periods to generate cash flow and to maximize TRASM. The prevalence of discount fares can be 
particularly acute when a competitor has excess capacity that it is unable to fill at higher rates. A key element to our 
competitive strategy is to maintain very low unit costs in order to permit us to compete successfully in price-sensitive markets.

Seasonality

Our business is subject to significant seasonal fluctuations. We generally expect demand to be greater in the second and 

third quarters each year due to more vacation travel during these periods, as compared to the rest of the year. The air 
transportation business is also volatile and highly affected by economic cycles and trends.

Distribution

The majority of our tickets are sold through direct channels, including online via www.spirit.com, our call center and our 
airport ticket counters, with spirit.com being the primary channel. We also partner with a number of third parties to distribute 
our tickets, including online and traditional travel agents and electronic global distribution systems. 

Customers

We believe our customers are primarily leisure travelers who are paying for their own ticket and who make their purchase 

decision based largely on price. By maintaining a low cost structure, we can successfully sell tickets at low fares while 
maintaining a strong profit margin.  

Customer Service

We are committed to taking care of our customers. We believe focusing on customer service in every aspect of our 

operations, including personnel, flight equipment, in-flight and ancillary amenities, on-time performance, flight completion 
ratios, and baggage handling, will strengthen customer loyalty and attract new customers. We proactively aim to improve our 
operations to ensure further improvement in customer service. 

Our online booking process allows our customers to see all available options and their prices prior to purchasing a ticket. 
We maintain a campaign that illustrates our total prices are lower, on average, than those of our competitors, even when options 
are included.

7

 
Fleet

We fly only Airbus A320 family aircraft, which provides us significant operational and cost advantages compared to 
airlines that operate multiple aircraft types. By operating a single aircraft type, we avoid the incremental costs of training crews 
across multiple types. Flight crews are entirely interchangeable across all of our aircraft, and maintenance, spare parts 
inventories and other operational support remains highly simplified compared to those airlines with more complex fleets. Due 
to this commonality among Airbus single-aisle aircraft, we can retain the benefits of a fleet comprised of a single type of 
aircraft while still having the flexibility to match the capacity and range of the aircraft to the demands of each route.

As of December 31, 2017, we had a fleet of 112 Airbus single-aisle aircraft, which are commonly referred to as “A320 

family” aircraft.  A320 family aircraft include the A319, A320 and A321 models, which have broadly common design and 
equipment but differ most notably in fuselage length, service range and seat capacity. Within the A320 family of aircraft, 
models using existing engine technology may carry the suffix “ceo,” denoting the “current engine option,” while models 
equipped with new-generation engines may carry the suffix “neo,” denoting the “new engine option.”  As of December 31, 
2017, our fleet consisted of 31 A319s, 51 A320ceos, 5 A320neos and 25 A321ceos, and the average age of the fleet was 5.1 
years. As of December 31, 2017, we owned 54 of our aircraft, of which 29 aircraft are financed through senior and junior long-
term debt with terms of 12 and 7 years, respectively, 17 aircraft are financed through enhanced equipment trust certificates 
(EETCs), and 8 aircraft were purchased off lease and currently unencumbered. Refer to “Notes to the Financial Statements—
11. Debt and Other Obligations” for information regarding our debt financing and “Notes to the Financial Statements—3. 
Special Charges” for information regarding our aircraft purchased off lease. The remaining 58 of our aircraft are financed under 
operating leases with expirations between 2020 and 2029. In addition, as of December 31, 2017, we had 11 spare engines 
financed under operating leases and owned 4 spare engines.

As of December 31, 2017, firm aircraft orders consisted of 59 A320 family aircraft (6 A320ceos, 48 A320neos and 5 

A321ceos) with Airbus. During the first quarter of 2018, we negotiated revisions to our A320 aircraft order. We originally had 
14 A320neo aircraft scheduled for delivery in 2019. Pursuant to the revision, 5 of the 14 scheduled A320neo aircraft were 
converted to A320ceo aircraft but remain scheduled to be delivered in 2019. As of December 31, 2017, spare engine orders 
consisted of four V2500 SelectTwo engines with IAE and nine PurePower PW 1100G-JM engines with Pratt & Whitney. 
Aircraft are scheduled for delivery from 2018 through 2021 and spare engines are scheduled for delivery from 2018 through 
2023. The firm aircraft orders provide for capacity growth as well as the flexibility to add to, or replace, the aircraft in our 
present fleet. We may elect to supplement these deliveries by additional acquisitions from the manufacturer or in the open 
market if demand conditions merit. We also may adjust or defer deliveries, or change models of aircraft in our delivery stream, 
from time to time, as a means to match our future capacity with anticipated demand and growth trends.

Consistent with our ULCC business model, each of our aircraft is configured with a high density seating configuration, 

which helps us maintain a lower unit cost and pass savings to our customers. Our high density seating configuration 
accommodates more passengers than those of our competitors when comparing the same type of aircraft. 

Maintenance and Repairs

We have a Federal Aviation Administration (FAA) mandated and approved maintenance program, which is administered 
by our technical services department. Our maintenance technicians undergo extensive initial and ongoing training to ensure the 
safety of our aircraft.

Aircraft maintenance and repair consists of routine and non-routine maintenance, and work performed is divided into 
three general categories: line maintenance, heavy maintenance and component service. Line maintenance consists of routine 
daily and weekly scheduled maintenance checks on our aircraft, including pre-flight, daily, weekly and overnight checks, and 
any diagnostics and routine repairs and any unscheduled items on an as needed basis. Line maintenance events are currently 
serviced by in-house mechanics supplemented by contract labor and are primarily completed at airports we currently serve. 
Heavy airframe maintenance checks consist of a series of more complex tasks that can take from one to four weeks to 
accomplish and typically are required approximately every 24 months. Heavy engine maintenance is performed approximately 
every four to six years and includes a more complex scope of work. Due to our relatively small fleet size and projected fleet 
growth, we believe outsourcing all of our heavy maintenance activity, such as engine servicing, heavy airframe maintenance 
checks, major part repair and component service repairs is more economical. Outsourcing eliminates the substantial initial 
capital requirements inherent in heavy aircraft maintenance. We have entered into a long-term flight hour agreement for our 
current fleet and future deliveries with IAE and Pratt & Whitney for our engine overhaul services and with Lufthansa Technik 
on an hour-by-hour basis for component services. We outsource our heavy airframe maintenance to FAA-qualified maintenance 
providers. 

Our recent maintenance expenses have been lower than what we expect to incur in the future because of the relatively 

young age of our aircraft fleet. Our maintenance costs are expected to increase as the scope of repairs increases with the 

8

increasing age of our fleet. As our aircraft age, scheduled scope of work and frequency of unscheduled maintenance events is 
likely to increase like any maturing fleet. Our aircraft utilization rate could decrease with the increase in aircraft maintenance.

In the first quarter of 2017, we inaugurated a 126,000-square-foot maintenance hangar facility, adjacent to the airfield at 

the Detroit Metropolitan Wayne County Airport, which allows us to fulfill the requirements of our growing fleet and will 
reduce dependence on third-party facilities and contract line maintenance. Please see “-Properties-Ground Facilities.”

Employees

Our business is labor intensive, with labor costs representing approximately 23.4%, 25.2% and 23.1% of our total 
operating costs for 2017, 2016 and 2015, respectively. As of December 31, 2017, we had 1,792 pilots, 3,011 flight attendants, 
51 dispatchers, 245 ramp service agents, 699 mechanics, 425 airport agents/other and 572 employees in administrative roles for 
a total of 6,795 employees. As of December 31, 2017, approximately 75% of our employees were represented by four labor 
unions. On an average full-time equivalent basis, for the full year 2017, we had 6,100 employees, compared to 5,159 in 2016.

FAA regulations require pilots to have commercial licenses with specific ratings for the aircraft to be flown and be 

medically certified as physically fit to fly. FAA and medical certifications are subject to periodic renewal requirements, 
including recurrent training and recent flying experience. Mechanics, quality-control inspectors and dispatchers must be 
certificated and qualified for specific aircraft. Flight attendants must have initial and periodic competency training and 
qualification. Training programs are subject to approval and monitoring by the FAA. Management personnel directly involved 
in the supervision of flight operations, training, maintenance and aircraft inspection must also meet experience standards 
prescribed by FAA regulations. All safety-sensitive employees are subject to pre-employment, random and post-accident drug 
testing.

The Railway Labor Act, or RLA, governs our relations with labor organizations. Under the RLA, our collective 
bargaining agreements generally do not expire, but instead become amendable as of a stated date. If either party wishes to 
modify the terms of any such agreement, they must notify the other party in the manner agreed to by the parties. Under the 
RLA, after receipt of such notice, the parties must meet for direct negotiations. If no agreement is reached, either party may 
request the National Mediation Board, or NMB, to appoint a federal mediator. The RLA prescribes no set timetable for the 
direct negotiation and mediation process. It is not unusual for those processes to last for many months, and even several years. 
If no agreement is reached in mediation, the NMB in its discretion may declare at some time that an impasse exists. If an 
impasse is declared, the NMB proffers binding arbitration to the parties. Either party may decline to submit to arbitration. If 
arbitration is rejected by either party, a 30-day “cooling off” period commences. During that period (or after), a Presidential 
Emergency Board, or PEB, may be established, which examines the parties’ positions and recommends a solution. The PEB 
process lasts for 30 days and is followed by another “cooling off” period of 30 days. At the end of a “cooling off” period, unless 
an agreement is reached or action is taken by Congress, the labor organization and the airline each may resort to “self-help,” 
including, for the labor organization, a strike or other labor action, and for the airline, the imposition of any or all of its 
proposed amendments and the hiring of new employees to replace any striking workers. Congress and the President have the 
authority to prevent “self-help” by enacting legislation that, among other things, imposes a settlement on the parties. The table 
below sets forth our employee groups and status of the collective bargaining agreements.

Employee Groups
Pilots

Flight Attendants

Dispatchers

Ramp Service Agents

Representative
Air Line Pilots Association, International (ALPA)

Association of Flight Attendants (AFA-CWA)

Transport Workers Union (TWU)

International Association of Machinists and Aerospace Workers
(IAMAW)

Amendable Date
August 2015

May 2021

August 2018

June 2020

In August 2015, the Company's collective bargaining agreement with its pilots, represented by ALPA, became 

amendable. In June 2016, ALPA requested the services of the National Mediation Board (NMB) to facilitate negotiations for an 
amended agreement and the Company joined ALPA in the request. In January 2018, under the guidance of the NMB assigned 
mediators, the parties reached a tentative amendable agreement which is subject to ratification by the pilot group. The 
ratification vote will take place throughout February 2018. The current tentative agreement is for a five-year contract which 
includes a one-time $75 million ratification incentive and other negotiated contractual provisions. The Company can provide no 
assurance that the tentative agreement will be approved. Under the Railway Labor Act (RLA), the parties' current agreement 
remains in effect until an amended agreement is ratified.

In March 2016, under the supervision of the NMB, the Company and AFA-CWA reached a tentative agreement for a five-

year contract with the Company's flight attendants. In May 2016, the flight attendants voted to approve the new five-year 

9

  
  
  
  
  
  
  
  
contract with the Company. In connection with this agreement, the Company paid a $9.6 million ratification incentive payment 
to the flight attendants recorded within salaries, wages and benefits in the statement of operations. Of the total ratification 
incentive, $8.4 million was recorded during 2016 as the remaining $1.2 million was previously accrued in 2015. 

In December 2017, the Professional Airline Flight Control Association (“PAFCA”) filed an application with the NMB 

seeking to represent our dispatchers, who are currently represented by the TWU.  In January 2018, the NMB determined that a 
representation election would be held. The voting period for the representation election will close on February 20, 2018.  

We focus on hiring highly productive employees and, where feasible, designing systems and processes around 

automation and outsourcing in order to maintain our low-cost base.

Safety and Security

We are committed to the safety and security of our passengers and employees. We strive to comply with or exceed health 
and safety regulation standards. In pursuing these goals, we maintain an active aviation safety program. All of our personnel are 
expected to participate in the program and take an active role in the identification, reduction and elimination of hazards.

Our ongoing focus on safety relies on training our employees to proper standards and providing them with the tools and 
equipment they require so they can perform their job functions in a safe and efficient manner. Safety in the workplace targets 
several areas of our business, including: flight operations, maintenance, in-flight, dispatch and station operations. The 
Transportation Security Administration, or TSA, is charged with aviation security for both airlines and airports. We maintain 
active, open lines of communication with the TSA at all of our locations to ensure proper standards for security of our 
personnel, customers, equipment and facilities are exercised throughout our business.

Insurance

We maintain insurance policies we believe are customary in the airline industry and as required by the Department of 

Transportation (DOT). The policies principally provide liability coverage for public and passenger injury; damage to property; 
loss of or damage to flight equipment; fire and extended coverage; war risk (terrorism); directors’ and officers’ liability; 
advertiser and media liability; cyber risk liability; fiduciary; and workers’ compensation and employer’s liability. Renewing 
coverage could result in a change in premium and more restrictive terms. Although we currently believe our insurance coverage 
is adequate, there can be no assurance that the amount of such coverage will not be changed or that we will not be forced to 
bear substantial losses from accidents. 

Management Information Systems

We have continued our commitment to technology improvements to support our ongoing operations and initiatives. In 

2016, we upgraded the Sabre Flight Operating Suite to Flight Plan Manager. During 2017, we completed the migration of 
critical operating and sales systems into a state of the art data center facility in South Florida, implemented a new customer 
mobile application, deployed all new self-service kiosks, and improved the customer experience on our website. We intend to 
continue to invest time and resources in upgrading and improving our information systems and the security of our data.

Foreign Ownership

Under DOT regulations and federal law, we must be controlled by U.S. citizens. In order to qualify, at least 75% of our 

stock must be voted by U.S. citizens, and our president and at least two-thirds of our board of directors and senior management 
must be U.S. citizens. 

We believe we are currently in compliance with such foreign ownership rules. 

Government Regulation

Operational Regulation

The airline industry is heavily regulated, especially by the federal government. Two of the primary regulatory authorities 

overseeing air transportation in the United States are the DOT and the Federal Aviation Administration (FAA). The DOT has 
jurisdiction over economic and consumer issues affecting air transportation, such as competition, route authorizations, 
advertising and sales practices, baggage liability and disabled passenger transportation, tarmac delays and responding to 
customer complaints among other areas. In January 2017, DOT issued a Supplemental Notice of Proposed Rulemaking of rules 
originally proposed in 2014 that would require airlines to disclose through all points of sale the fees for first and second 
checked bags and a carry-on bag associated with the air transportation consumers are buying or considering buying. In 
December 2017, the DOT withdrew said supplemental notice, as well as a notice of proposed rulemaking originally issued in 

10

July 2011 that proposed to collect detailed revenue information regarding airline imposed fees from those air carriers meeting 
the definition of a large certificated air carrier. In March 2017, the DOT extended the compliance date of its final rule on 
reporting of data for mishandled baggage and wheelchairs from January 2018 to January 2019. Under this rule, carriers are 
required to report the number of mishandled bags and the number of enplaned bags, as well as to report separate statistics for 
mishandled wheelchairs and scooters used by passengers with disabilities. In 2016, Congress passed a law requiring airlines to 
refund checked bag fees for delayed bags if they are not delivered to the passenger within a specified number of hours. Though 
the DOT has been collecting information from carriers and other interested parties and organizations from which to develop a 
rule, as of January 2018, a rule has not been issued. Additional rules, including disabled passenger rules, may be issued in 2018. 
See “Risk Factors—Restrictions on or increased taxes applicable to charges for ancillary products and services paid by airline 
passengers and burdensome consumer protection regulations or laws which could harm our business, results of operations and 
financial condition."

The DOT has authority to issue certificates of public convenience and necessity required for airlines to provide air 
transportation. We hold a DOT certificate of public convenience and necessity authorizing us to engage in scheduled air 
transportation of passengers, property and mail within the United States, its territories and possessions and between the United 
States and all countries that maintain a liberal aviation trade relationship with the United States (known as “open skies” 
countries). We also hold DOT certificates to engage in air transportation to certain other countries with more restrictive aviation 
policies.

The FAA is responsible for regulating and overseeing matters relating to air carrier flight operations, including airline 

operating certificates, aircraft certification and maintenance and other matters affecting air safety. The FAA requires each 
commercial airline to obtain and hold an FAA air carrier certificate. This certificate, in combination with operations 
specifications issued to the airline by the FAA, authorizes the airline to operate at specific airports using aircraft approved by 
the FAA. As of December 31, 2017, we had FAA airworthiness certificates for all of our aircraft, we had obtained the necessary 
FAA authority to fly to all of the cities we currently serve, and all of our aircraft had been certified for overwater operations. In 
2014, the FAA issued its final regulations governing pilot rest periods and work hours for all airlines certificated under Part 121 
of the Federal Aviation Regulations. The rule, known as FAR 117 which became effective on January 4, 2014, impacts the 
required amount and timing of rest periods for pilots between work assignments, and modifies duty and rest requirements based 
on the time of day, number of scheduled segments, flight types, time zones and other factors. FAR 117 resulted in increased 
pilot costs as we were required to hire more pilots in order to comply with the regulations. Any new or revised operational 
regulations in the future could result in further increased costs. We believe we hold all necessary operating and airworthiness 
authorizations, certificates and licenses and are operating in compliance with applicable DOT and FAA regulations, 
interpretations and policies.

International Regulation

All international service is subject to the regulatory requirements of the foreign government involved. We currently offer 
international service to Aruba, Colombia, Costa Rica, Dominican Republic, Ecuador, El Salvador, Guatemala, Haiti, Honduras, 
Jamaica, Mexico, Nicaragua, Panama, Peru and St. Maarten, as well as Puerto Rico and the U.S. Virgin Islands. If we decide to 
increase our routes to additional international destinations, we will be required to obtain necessary authority from the DOT and 
the applicable foreign government. We are also required to comply with overfly regulations in countries that lay along our 
routes but which we do not serve.

International service is also subject to Customs and Border Protection, or CBP, immigration and agriculture requirements 
and the requirements of equivalent foreign governmental agencies. Like other airlines flying international routes, from time to 
time we may be subject to civil fines and penalties imposed by CBP if unmanifested or illegal cargo, such as illegal narcotics, is 
found on our aircraft. These fines and penalties, which in the case of narcotics are based upon the retail value of the seizure, 
may be substantial. We have implemented a comprehensive security program at our airports to reduce the risk of illegal cargo 
being placed on our aircraft, and we seek to cooperate actively with CBP and other U.S. and foreign law enforcement agencies 
in investigating incidents or attempts to introduce illegal cargo.

Security Regulation

The TSA was created in 2001 with the responsibility and authority to oversee the implementation, and ensure the 
adequacy of security measures at airports and other transportation facilities. Funding for passenger security is provided in part 
by a per enplanement ticket tax (passenger security fee). Prior to and for the first half of 2014, this fee was $2.50 per passenger 
flight segment, subject to a maximum of $5 per one-way trip. Effective July 1, 2014, the security fee was set at a flat rate of 
$5.60 each way. On December 19, 2014, the law was amended to limit a round-trip fee to $11.20. In addition, in the past, the 
TSA has assessed an Aviation Security Infrastructure Fee, or ASIF, on each airline. This fee was eliminated by the TSA 

11

effective October 1, 2014. We cannot forecast what additional security and safety requirements may be imposed in the future or 
the costs or revenue impact that would be associated with complying with such requirements.

Environmental Regulation

We are subject to various federal, state and local laws and regulations relating to the protection of the environment and 

affecting matters such as aircraft engine emissions, aircraft noise emissions and the discharge or disposal of materials and 
chemicals, which laws and regulations are administered by numerous state and federal agencies. The Environmental Protection 
Agency, or EPA, regulates operations, including air carrier operations, which affect the quality of air in the United States. We 
believe the aircraft in our fleet meet all emission standards issued by the EPA. Concern about climate change and greenhouse 
gases may result in additional regulation or taxation of aircraft emissions in the United States and abroad.

Federal law recognizes the right of airport operators with special noise problems to implement local noise abatement 
procedures so long as those procedures do not interfere unreasonably with interstate and foreign commerce and the national air 
transportation system. These restrictions can include limiting nighttime operations, directing specific aircraft operational 
procedures during takeoff and initial climb, and limiting the overall number of flights at an airport.

Other Regulations

We are subject to certain provisions of the Communications Act of 1934, as amended, and are required to obtain an 

aeronautical radio license from the Federal Communications Commission, or FCC. To the extent we are subject to FCC 
requirements, we will take all necessary steps to comply with those requirements. We are also subject to state and local laws 
and regulations at locations where we operate and the regulations of various local authorities that operate the airports we serve.

Future Regulations

The U.S. and foreign governments may consider and adopt new laws, regulations, interpretations and policies regarding a 

wide variety of matters that could directly or indirectly affect our results of operations. We cannot predict what laws, 
regulations, interpretations and policies might be considered in the future, nor can we judge what impact, if any, the 
implementation of any of these proposals or changes might have on our business.

12

ITEM 1A. 

RISK FACTORS

Cautionary Statement Regarding Forward-Looking Statements

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act 
of 1933, as amended (the Securities Act), and Section 21E of the Securities Exchange Act of 1934, as amended (the Exchange 
Act) which are subject to the “safe harbor” created by those sections. Forward-looking statements are based on our 
management’s beliefs and assumptions and on information currently available to our management. All statements other than 
statements of historical facts are “forward-looking statements” for purposes of these provisions. In some cases, you can 
identify forward-looking statements by terms such as “may,” “will,” “should,” “could,” “would,” “expect,” “plan,” 
“anticipate,” “believe,” “estimate,” “project,” “predict,” “potential,” and similar expressions intended to identify forward-
looking statements. Such forward-looking statements are subject to risks, uncertainties and other important factors that could 
cause actual results and the timing of certain events to differ materially from future results expressed or implied by such 
forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those 
identified below. Furthermore, such forward-looking statements speak only as of the date of this report. Except as required by 
law, we undertake no obligation to update any forward-looking statements to reflect events or circumstances after the date of 
such statements. Additional risks or uncertainties (i) that are not currently known to us, (ii) that we currently deem to be 
immaterial, or (iii) that could apply to any company, could also materially adversely affect our business, financial condition, or 
future results. You should carefully consider the risks described below and the other information in this report. If any of the 
following risks materialize, our business could be materially harmed, and our financial condition and results of operations 
could be materially and adversely affected. References in this report to “Spirit,” “we,” “us,” “our,” or the “Company” shall 
mean Spirit Airlines, Inc., unless the context indicates otherwise.

We operate in an extremely competitive industry.

Risks Related to Our Industry

We face significant competition with respect to routes, fares and services. Within the airline industry, we compete with 

traditional network airlines, other low-cost airlines and regional airlines on many of our routes. Competition in most of the 
destinations we presently serve is intense, sometimes due to the large number of carriers in those markets. Furthermore, other 
airlines may begin service or increase existing service on routes where we currently face little competition. Most of our 
competitors are larger than us and have significantly greater financial and other resources than we do.

The airline industry is particularly susceptible to price discounting because once a flight is scheduled, airlines incur only 

nominal additional costs to provide service to passengers occupying otherwise unsold seats. Increased fare or other price 
competition has, and may continue to, adversely affect our operations. Moreover, many other airlines have begun to unbundle 
services by charging separately for services such as baggage and advance seat selection. This unbundling and other cost 
reducing measures could enable competitor airlines to reduce fares on routes that we serve. Beginning in 2015, and continuing 
through 2017, the availability of low priced fares coupled with an increase in domestic capacity led to dramatic changes in 
pricing behavior in many U.S. markets. Many domestic carriers began matching lower cost airline pricing, either with limited 
or unlimited inventory. 

Airlines increase or decrease capacity in markets based on perceived profitability, market share objectives, competitive 

considerations and other reasons. Decisions by our competitors that increase overall industry capacity, or capacity dedicated to 
a particular domestic or foreign region, market or route, could have a material adverse impact on our business. If a traditional 
network airline were to successfully develop a low-cost structure, compete with us on price or if we were to experience 
increased competition from other low-cost carriers, our business could be materially adversely affected.

Many of the traditional network airlines in the United States have on one or more occasions initiated bankruptcy 
proceedings in attempts to restructure their debt and other obligations and reduce their operating costs. They also have 
completed large mergers that have increased their scale and share of the travel market. The mergers between AMR Corporation 
and US Airways Group, Inc., Delta Air Lines and Northwest Airlines, between United Airlines and Continental Airlines, 
between Southwest Airlines and AirTran Airways, and between Alaska Airlines and Virgin America, have created five very 
large and powerful network airlines, which creates a challenging pricing environment for smaller airlines like us. In the future, 
there may be additional consolidation in our industry. Any business combination could significantly alter industry conditions 
and competition within the airline industry, which could have an adverse effect on our business. 

13

 
Our growth and the success of our ULCC business model could stimulate competition in our markets through our 
competitors’ development of their own ULCC strategies, new pricing policies designed to compete with ULCCs or new market 
entrants. Any such competitor may have greater financial resources and access to less expensive sources of capital than we do, 
which could enable them to operate their business with a lower cost structure, or enable them to operate with lower-marginal 
revenues without substantial adverse effects, than we can. If these competitors adopt and successfully execute a ULCC business 
model, we could be materially adversely affected. In 2015, Delta Air Lines began to market and sell a "Basic Economy" fare 
which was designed in part to provide its customers with a low base fare similar to Spirit. In 2017, American Airlines and  
United Airlines announced their "Basic Economy" fare. 

The extremely competitive nature of the airline industry could prevent us from attaining the level of passenger traffic or 

maintaining the level of fares or revenues related to ancillary services required to sustain profitable operations in new and 
existing markets and could impede our growth strategy, which could harm our operating results. Due to our relatively small 
size, we are susceptible to a fare war or other competitive activities in one or more of the markets we serve, which could have a 
material adverse effect on our business, results of operations and financial condition.

Our low-cost structure is one of our primary competitive advantages, and many factors could affect our ability to 
control our costs.

Our low-cost structure is one of our primary competitive advantages. However, we have limited control over many of our 
costs. For example, we have limited control over the price and availability of aircraft fuel, aviation insurance, airport costs and 
related infrastructure taxes, the cost of meeting changing regulatory requirements and our cost to access capital or financing. In 
addition, the compensation and benefit costs applicable to a significant portion of our employees are established by the terms of 
our collective bargaining agreements. We cannot guarantee we will be able to maintain a cost advantage over our competitors. 
If our cost structure increases and we are no longer able to maintain a sufficient cost advantage over our competitors, it could 
have a material adverse effect on our business, results of operations and financial condition.

The airline industry is heavily influenced by the price and availability of aircraft fuel. Continued volatility in fuel costs 
or significant disruptions in the supply of fuel, including hurricanes and other events affecting the Gulf Coast in 
particular, could materially adversely affect our business, results of operations and financial condition.

Aircraft fuel costs represented 27.3%, 23.8% and 28.3% of our total operating expenses for 2017, 2016 and 2015, 
respectively. As such, our operating results are significantly affected by changes in the availability and the cost of aircraft fuel, 
especially aircraft fuel refined in the U.S. Gulf Coast region, on which we are highly dependent. Both the cost and the 
availability of aircraft fuel are subject to many meteorological, economic and political factors and events occurring throughout 
the world, which we can neither control nor accurately predict. For example, a major hurricane making landfall along the Gulf 
Coast could cause disruption to oil production, refinery operations and pipeline capacity in that region, possibly resulting in 
significant increases in the price of aircraft fuel and diminished availability of aircraft fuel supply. Any disruption to oil 
production, refinery operations, or pipeline capacity in the Gulf Coast region could have a disproportionate impact on our 
operating results compared to other airlines that have more diversified fuel sources. Fuel prices also may be affected by 
geopolitical and macroeconomic conditions and events that are outside of our control, including volatility in the relative 
strength of the U.S. dollar, the currency in which oil is denominated. Instability within major oil producing regions, such as the 
Middle East and Venezuela, changes in demand from major petroleum users such as China, and secular increases in competing 
energy sources are examples of these trends.

Aircraft fuel prices have been subject to high volatility, fluctuating substantially over the past several years. For example, 

our fuel prices spiked at a high of $3.32 per gallon, in the second quarter of 2012, fell as low as $1.22 per gallon in the first 
quarter of 2016 and recently returned to over $2.00 per gallon. We cannot predict the future availability, price volatility or cost 
of aircraft fuel. Due to the large proportion of aircraft fuel costs in our total operating cost base, even a relatively small increase 
or decrease in the price of aircraft fuel can have a significant negative impact on our operating costs or revenues and on our 
business, results of operations and financial condition.

Our fuel derivative activity, if any, may not reduce our fuel costs.

From time to time, we may enter into fuel derivative contracts in order to mitigate the risk to our business from future 
volatility in fuel prices. Our derivatives may generally consist of United States Gulf Coast jet fuel swaps (jet fuel swaps) and 
United States Gulf Coast jet fuel options (jet fuel options). Both jet fuel swaps and jet fuel options can be used at times to 
protect the refining risk between the price of crude oil and the price of refined jet fuel, and to manage the risk of increasing fuel 
prices. As of December 31, 2017, we had no outstanding jet fuel derivatives. There can be no assurance that we will be able to 
enter into fuel derivative contracts in the future if we are required or choose to do so. Our liquidity and general level of capital 
resources impacts our ability to hedge our fuel requirements. Even if we are able to hedge portions of our future fuel 
requirements, we cannot guarantee that our derivative contracts will provide sufficient protection against increased fuel costs or 
14

that our counterparties will be able to perform under our derivative contracts, such as in the case of a counterparty’s insolvency. 
Furthermore, our ability to react to the cost of fuel, absent hedging, is limited because we set the price of tickets in advance of 
incurring fuel costs. Our ability to pass on any significant increases in aircraft fuel costs through fare increases could also be 
limited. In the event of a reduction in fuel prices compared to our hedged position, if any, our hedged positions could counteract 
the cost benefit of lower fuel prices and may require us to post cash margin collateral. Please see “Management’s Discussion 
and Analysis of Financial Condition and Results of Operations—Trends and Uncertainties Affecting Our Business—Aircraft 
Fuel.”

Restrictions on or increased taxes applicable to charges for ancillary products and services paid by airline passengers 
and burdensome consumer protection regulations or laws could harm our business, results of operations and financial 
condition.

During 2017, 2016 and 2015, we generated non-ticket revenues of $1,281.6 million, $1,121.3 million and $972.1 million, 
respectively. Our non-ticket revenues are generated from charges for, among other things, baggage, bookings through certain of 
our distribution channels, advance seat selection, itinerary changes and loyalty programs. The DOT has rules governing many 
facets of the airline-consumer relationship, including, for instance, price advertising, tarmac delays, bumping of passengers 
from flights, ticket refunds and the carriage of disabled passengers. If we are not able to remain in compliance with these rules, 
the DOT may subject us to fines or other enforcement action, including requirements to modify our passenger reservations 
system, which could have a material adverse effect on our business. The U.S. Congress and Federal administrative 
agencies have investigated the increasingly common airline industry practice of unbundling the pricing of certain products and 
services. If new taxes are imposed on non-ticket revenues, or if other laws or regulations are adopted that make unbundling of 
airline products and services impermissible, or more cumbersome or expensive, our business, results of operations and financial 
condition could be harmed. Congressional and other government scrutiny may also change industry practice or public 
willingness to pay for ancillary services. See also “—We are subject to extensive regulation by the Federal Aviation 
Administration, the Department of Transportation and other U.S. and foreign governmental agencies, compliance with which 
could cause us to incur increased costs and adversely affect our business and financial results.”

The airline industry is particularly sensitive to changes in economic conditions. Adverse economic conditions would 
negatively impact our business, results of operations and financial condition.

Our business and the airline industry in general are affected by many changing economic conditions beyond our control, 

including, among others:

• 

• 

• 

• 

• 

changes and volatility in general economic conditions, including the severity and duration of any downturn in the U.S. 
or global economy and financial markets;

changes in consumer preferences, perceptions, spending patterns or demographic trends, including any increased 
preference for higher-fare carriers offering higher amenity levels, and reduced preferences for low-fare carriers 
offering more basic transportation, during better economic times;

higher levels of unemployment and varying levels of disposable or discretionary income;

depressed housing and stock market prices; and

lower levels of actual or perceived consumer confidence.

These factors can adversely affect, and from time to time have adversely affected, our results of operations, our ability to 

obtain financing on acceptable terms and our liquidity. Unfavorable general economic conditions, such as higher 
unemployment rates, a constrained credit market, housing-related pressures and increased focus on reducing business operating 
costs can reduce spending for price-sensitive leisure and business travel. For many travelers, in particular the price-sensitive 
travelers we serve, air transportation is a discretionary purchase that they may reduce or eliminate from their spending in 
difficult economic times. The overall decrease in demand for air transportation in the United States in 2008 and 2009 resulting 
from record high fuel prices and the economic recession required us to take significant steps to reduce our capacity, which 
reduced our revenues. Unfavorable economic conditions could also affect our ability to raise prices to counteract increased fuel, 
labor or other costs, resulting in a material adverse effect on our business, results of operations and financial condition.

The airline industry faces ongoing security concerns and related cost burdens, furthered by threatened or actual 
terrorist attacks or other hostilities that could significantly harm our industry and our business.

The terrorist attacks of September 11, 2001 and their aftermath negatively affected the airline industry. The primary 

effects experienced by the airline industry included:

15

• 

• 

• 

• 

• 

substantial loss of revenue and flight disruption costs caused by the grounding of all commercial air traffic in or 
headed to the United States by the FAA for three days after the terrorist attacks;

increased security and insurance costs;

increased concerns about future terrorist attacks;

airport shutdowns and flight cancellations and delays due to security breaches and perceived safety threats; and

significantly reduced passenger traffic and yields due to the subsequent dramatic drop in demand for air travel.

Since September 11, 2001, the Department of Homeland Security and the TSA have implemented numerous security 

measures that restrict airline operations and increase costs, and are likely to implement additional measures in the future. For 
example, following the widely publicized attempt of an alleged terrorist to detonate plastic explosives hidden underneath his 
clothes on a Northwest Airlines flight on Christmas Day in 2009, passengers became subject to enhanced random screening, 
which included pat-downs, explosive detection testing and body scans. Enhanced passenger screening, increased regulation 
governing carry-on baggage and other similar restrictions on passenger travel may further increase passenger inconvenience 
and reduce the demand for air travel. In addition, increased or enhanced security measures have tended to result in higher 
governmental fees imposed on airlines, resulting in higher operating costs for airlines, which we may not be able to pass on to 
consumers in the form of higher prices. Any future terrorist attacks or attempted attacks, even if not made directly on the airline 
industry, or the fear of such attacks or other hostilities (including elevated national threat warnings or selective cancellation or 
redirection of flights due to terror threats) would likely have a material adverse effect on our business, results of operations and 
financial condition and on the airline industry in general.

Airlines are often affected by factors beyond their control, including: air traffic congestion at airports; air traffic 
control inefficiencies; adverse weather conditions, such as hurricanes or blizzards; increased security measures; new 
travel related taxes or the outbreak of disease, any of which could harm our business, operating results and financial 
condition.

Like other airlines, our business is affected by factors beyond our control, including air traffic congestion at airports, air 
traffic control inefficiencies, adverse weather conditions, increased security measures, new travel related taxes, the outbreak of 
disease, new regulations or policies from the presidential administration and Congress. Factors that cause flight delays frustrate 
passengers and increase costs, which in turn could adversely affect profitability. The federal government currently controls all 
U.S. airspace, and airlines are completely dependent on the FAA to operate that airspace in a safe, efficient and affordable 
manner. The air traffic control system, which is operated by the FAA, faces challenges in managing the growing demand for 
U.S. air travel. U.S. and foreign air-traffic controllers often rely on outdated technologies that routinely overwhelm the system 
and compel airlines to fly inefficient, indirect routes resulting in delays. A significant portion of our operations is concentrated 
in markets such as South Florida, the Caribbean, Latin America and the Northeast and Northern Midwest regions of the United 
States, which are particularly vulnerable to weather, airport traffic constraints and other delays. Adverse weather conditions and 
natural disasters, such as hurricanes affecting southern Florida and the Caribbean (such as Hurricanes Irma and Maria in 
September 2017) as well as southern Texas (such as Hurricane Harvey in August 2017), winter snowstorms or earthquakes 
(such as the September 2017 earthquakes in Mexico City, Mexico) can cause flight cancellations, significant delays and certain 
facility disruptions. For example, during 2017, the timing and location of Hurricanes Irma and Maria produced a domino effect 
on our operations resulting in approximately 1,400 flight cancellations and numerous flight delays, which resulted in an adverse 
effect on our results of operations. Cancellations or delays due to adverse weather conditions or natural disasters, air traffic 
control problems or inefficiencies, breaches in security or other factors may affect us to a greater degree than other, larger 
airlines that may be able to recover more quickly from these events, and therefore could harm our business, results of 
operations and financial condition to a greater degree than other air carriers. Because of our high utilization, point-to-point 
network, operational disruptions can have a disproportionate impact on our ability to recover. In addition, many airlines 
reaccommodate their disrupted passengers on other airlines at prearranged rates under flight interruption manifest agreements. 
We have been unsuccessful in procuring any of these agreements with our peers, which makes our recovery from disruption 
more challenging than for larger airlines that have these agreements in place. Similarly, outbreaks of pandemic or contagious 
diseases, such as Ebola, measles, avian flu, severe acute respiratory syndrome (SARS), H1N1 (swine) flu and Zika virus, could 
result in significant decreases in passenger traffic and the imposition of government restrictions in service and could have a 
material adverse impact on the airline industry. Any increases in travel related taxes could also result in decreases in passenger 
traffic. Any general reduction in airline passenger traffic could have a material adverse effect on our business, results of 
operations and financial condition.

Restrictions on or litigation regarding third-party membership discount programs could harm our business, operating 
results and financial condition.

16

We generate a relatively small but growing portion of our revenue from commissions, revenue share and other fees paid 

to us by third-party merchants for customer click-throughs, distribution of third-party promotional materials and referrals 
arising from products and services of the third-party merchants that we offer to our customers on our website. Some of these 
third-party referral-based offers are for memberships in discount programs or similar promotions made to customers who have 
purchased products from us, and for which we receive a payment from the third-party merchants for every customer that 
accepts the promotion. Certain of these third-party membership discount programs have been the subject of consumer 
complaints, litigation and regulatory actions alleging that the enrollment and billing practices involved in the programs violate 
various consumer protection laws or are otherwise deceptive. Any private or governmental claim or action that may be brought 
against us in the future relating to these third-party membership programs could result in our being obligated to pay damages or 
incurring legal fees in defending claims. These damages and fees could be disproportionate to the revenues we generate 
through these relationships. In addition, customer dissatisfaction or a significant reduction in or termination of the third-party 
membership discount offers on our website as a result of these claims could have a negative impact on our brand, and have a 
material adverse effect on our business, results of operations and financial condition.

We face competition from air travel substitutes.

In addition to airline competition from traditional network airlines, other low-cost airlines and regional airlines, we also 

face competition from air travel substitutes. On our domestic routes, we face competition from some other transportation 
alternatives, such as bus, train or automobile. In addition, technology advancements may limit the demand for air travel. For 
example, video teleconferencing and other methods of electronic communication may reduce the need for in-person 
communication and add a new dimension of competition to the industry as travelers seek lower-cost substitutes for air travel. If 
we are unable to adjust rapidly in the event the basis of competition in our markets changes, it could have a material adverse 
effect on our business, results of operations and financial condition.

Risks Related to Our Business

Increased labor costs, union disputes, employee strikes and other labor-related disruption may adversely affect our 
business, results of operations and financial conditions.

Our business is labor intensive, with labor costs representing approximately 23.4%, 25.2% and 23.1% of our total 
operating costs for 2017, 2016 and 2015, respectively. As of December 31, 2017, approximately 75% of our workforce was 
represented by labor unions. We cannot assure that our labor costs going forward will remain competitive because in the future 
our labor agreements may be amended or become amendable and new agreements could have terms with higher labor costs; 
one or more of our competitors may significantly reduce their labor costs, thereby reducing or eliminating our comparative 
advantages as to one or more of such competitors; or our labor costs may increase in connection with our growth. We may also 
become subject to additional collective bargaining agreements in the future as non-unionized workers may unionize.

Relations between air carriers and labor unions in the United States are governed by the Railway Labor Act, or the RLA. 

Under the RLA, collective bargaining agreements generally contain “amendable dates” rather than expiration dates, and the 
RLA requires that a carrier maintain the existing terms and conditions of employment following the amendable date through a 
multi-stage and usually lengthy series of bargaining processes overseen by the NMB. This process continues until either the 
parties have reached agreement on a new collective bargaining agreement, or the parties have been released to “self-help” by 
the NMB. In most circumstances, the RLA prohibits strikes; however, after release by the NMB, carriers and unions are free to 
engage in self-help measures such as lockouts and strikes.

Our flight operations were shut down due to a strike by our pilots beginning on June 12, 2010 and lasting until we and the 

union representing our pilots reached a tentative agreement for a new contract. Under a Return to Work Agreement, we began 
to resume flights on June 17, 2010 and resumed our full flight schedule on June 18, 2010. On August 1, 2010, we and the 
pilots’ union executed a five-year collective bargaining agreement. This shutdown had a material adverse effect on our results 
of operations for 2010. In August 2015, the collective bargaining agreement with our pilots, represented by ALPA, became 
amendable.  In June 2016, ALPA requested the services of the National Mediation Board (NMB) to facilitate negotiations for 
an amended agreement and we joined ALPA in the request. During 2017, we experienced operational disruption from pilot-
related work action which adversely impacted our results. We obtained a temporary restraining order to enjoin further illegal 
labor action. In January 2018, under the guidance of the NMB assigned mediators, the parties reached a tentative amendable 
agreement which is subject to ratification by the pilot group. The ratification vote will take place throughout February 2018. 
The current tentative agreement is for a five-year contract which includes a one-time $75 million ratification incentive and 
other negotiated contractual provisions. We can provide no assurance that the tentative agreement will be approved. Under the 
RLA, the parties' current agreement remains in effect until an amended agreement is ratified. Should the tentative agreement 
not be ratified, the NMB may release the parties to "self-help" and our pilots may go on strike, which would shut down our 
flight operations and have a material adverse effect on our business and results of operations. 

17

In March 2016, under the supervision of the NMB, we reached a tentative agreement for a five-year contract with our 
flight attendants. In May 2016, we entered into a five-year agreement with our flight attendants, which becomes amendable 
May 2021.

In August 2013, we entered into a five-year agreement with our dispatchers, which becomes amendable August 2018. In 
December 2017, PAFCA filed an application with the NMB seeking to represent our dispatchers, who are currently represented 
by the TWU. In January 2018, the NMB determined that a representation election would be held. The voting period for the 
representation election will close on February 20, 2018.  

In July 2014, certain ramp service agents directly employed by us voted to be represented by the IAMAW. In May 2015, 

we entered into a five-year interim collective bargaining agreement with the IAMAW, including material economic terms. In 
June 2016, we reached an agreement on the remaining terms of the collective bargaining agreement with the IAMAW, which is 
amendable in June 2020. 

The Patient Protection and Affordable Care Act was enacted in 2010. Under the current administration, this law may be 
repealed in its entirety or certain aspects may be changed or replaced. If the law is repealed or significantly modified or if new 
healthcare legislation is passed, such action could significantly increase cost of the healthcare benefits provided to our U.S. 
employees. In addition, the failure to comply materially with such existing and new laws, rules and regulations could adversely 
affect our business, results of operations and financial conditions. 

We have a significant amount of aircraft-related fixed obligations that could impair our liquidity and thereby harm our 
business, results of operations and financial condition.

The airline business is capital intensive and, as a result, many airline companies are highly leveraged. As of 

December 31, 2017, our 112 aircraft fleet consisted of 58 aircraft financed under operating leases, 46 aircraft financed under 
debt arrangements, and 8 aircraft purchased off lease and currently unencumbered. In 2017 and 2016, we paid the lessors rent 
of $220.9 million and $213.9 million, respectively, and paid maintenance deposits, net of reimbursements of $37.9 million and 
$45.9 million, respectively. As of December 31, 2017, we had future aircraft and spare engine operating lease obligations of 
approximately $1.3 billion. In 2017 and 2016, we made scheduled principal payments of $102.3 million and $64.4 million on 
our outstanding debt obligations, respectively. As of December 31, 2017, we had future principal debt obligations of $1.5 
billion, of which $121.0 million is due in 2018. In addition, we have significant obligations for aircraft and spare engines that 
we have ordered from Airbus, International Aero Engines AG, or IAE, and Pratt and Whitney for delivery over the next several 
years. Our ability to pay the fixed costs associated with our contractual obligations will depend on our operating performance, 
cash flow and our ability to secure adequate financing, which will in turn depend on, among other things, the success of our 
current business strategy, fuel price volatility, weakening or improvement in the U.S. economy, as well as general economic 
and political conditions and other factors that are beyond our control. The amount of our aircraft related fixed obligations and 
related need to obtain financing could have a material adverse effect on our business, results of operations and financial 
condition and could:

• 

• 

• 

require a substantial portion of cash flow from operations for operating lease and maintenance deposit payments, 
thereby reducing the availability of our cash flow to fund working capital, capital expenditures and other general 
corporate purposes;

limit our ability to make required pre-delivery deposit payments, or PDPs, including those payable to our aircraft and 
engine manufacturers for our aircraft and spare engines on order;

limit our ability to obtain additional financing to support our expansion plans and for working capital and other 
purposes on acceptable terms or at all;

•  make it more difficult for us to pay our other obligations as they become due during adverse general economic and 

market industry conditions because any related decrease in revenues could cause us to not have sufficient cash flows 
from operations to make our scheduled payments;

• 

• 

reduce our flexibility in planning for, or reacting to, changes in our business and the airline industry and, consequently, 
place us at a competitive disadvantage to our competitors with less fixed payment obligations; and

cause us to lose access to one or more aircraft and forfeit our rent deposits if we are unable to make our required 
aircraft lease rental and debt payments and our lessors or lenders exercise their remedies under the lease and debt 
agreements, including cross default provisions in certain of our leases and mortgages.

A failure to pay our operating lease, debt and other fixed cost obligations or a breach of our contractual obligations could 
result in a variety of adverse consequences, including the exercise of remedies by our creditors and lessors. In such a situation, 
18

it is unlikely that we would be able to cure our breach, fulfill our obligations, make required lease or debt payments or 
otherwise cover our fixed costs, which would have a material adverse effect on our business, results of operations and financial 
condition.

We are highly dependent upon our cash balances and operating cash flows.

As of December 31, 2017, we had access to lines of credit from our physical fuel delivery and derivative counterparties 
and our purchase credit card issuer aggregating $85.1 million. In addition, we had a $35.0 million unsecured standby letter of 
credit facility. These credit facilities are not adequate to finance our operations, and we will continue to be dependent on our 
operating cash flows and cash balances to fund our operations and to make scheduled payments on our aircraft related fixed 
obligations. In addition, our credit card processors are entitled to withhold receipts from customer purchases from us, under 
certain circumstances. Although our credit card processors currently do not have a right to hold back credit card receipts to 
cover repayment to customers, if we fail to maintain certain liquidity and other financial covenants, their rights to holdback 
would be reinstated, which would result in a reduction of unrestricted cash that could be material. In addition, we are required 
by some of our aircraft lessors to fund reserves in cash in advance for scheduled maintenance, and a portion of our cash is 
therefore unavailable until after we have completed the scheduled maintenance in accordance with the terms of the operating 
leases. Based on the age of our fleet and our growth strategy, these maintenance deposits will increase over the next few years 
before we receive any significant reimbursement for completed maintenance. If we fail to generate sufficient funds from 
operations to meet our operating cash requirements or do not obtain a line of credit, other borrowing facility or equity 
financing, we could default on our operating lease and fixed obligations. Our inability to meet our obligations as they become 
due would have a material adverse effect on our business, results of operations and financial condition.

A deterioration in worldwide economic conditions may adversely affect our business, operating results, financial 
condition, liquidity and ability to obtain financing or access capital markets.

The general worldwide economy has in the past experienced downturns due to the effects of the European debt crisis, 

unfavorable U.S. economic conditions and slowing growth in certain Asian economies, including general credit market crises, 
collateral effects on the finance and banking industries, energy price volatility, concerns about inflation, slower economic 
activity, decreased consumer confidence, reduced corporate profits and capital spending, adverse business conditions, 
geopolitical conflict and liquidity concerns. The airline industry is particularly sensitive to changes in economic conditions, 
which affect customer travel patterns and related revenues.  A weak economy could reduce our bookings, and a reduction in 
discretionary spending could also decrease amounts our customers are willing to pay.  Unfavorable economic conditions can 
also impact the ability of airlines to raise fares to help offset increased fuel, labor and other costs. We cannot accurately predict 
the effect or duration of any economic slowdown or the timing or strength of a subsequent economic recovery.

In addition, we have significant obligations for aircraft and spare engines that we have ordered from Airbus, IAE and 

Pratt and Whitney over the next several years, and we will need to finance these purchases. We may not have sufficient 
liquidity or creditworthiness to fund the purchase of aircraft and engines, including payment of PDPs, or for other working 
capital. Factors that affect our ability to raise financing or access the capital markets include market conditions in the airline 
industry, economic conditions, the perceived residual value of aircraft and related assets, the level and volatility of our earnings, 
our relative competitive position in the markets in which we operate, our ability to retain key personnel, our operating cash 
flows and legal and regulatory developments. Regardless of our creditworthiness, at times the market for aircraft purchase or 
lease financing has been very constrained due to such factors as the general state of the capital markets and the financial 
position of the major providers of commercial aircraft financing.

Our liquidity and general level of capital resources impact our ability to hedge our fuel requirements.

From time to time, we may enter into fuel derivative contracts in order to mitigate the risk to our business from future 
volatility in fuel prices, refining risk between the price of crude oil and the price of refined jet fuel, and to manage the risk of 
increasing fuel prices. As of December 31, 2017, we had no outstanding jet fuel derivatives. There can be no assurance that we 
will be able to enter into fuel derivative contracts in the future if we are required or choose to do so. In the past, we have not 
had and in the future we may not have sufficient creditworthiness or liquidity to post the collateral necessary to hedge our fuel 
requirements. Even if we are able to hedge portions of our future fuel requirements, we cannot guarantee that our derivative 
contracts will provide any particular level of protection against increased fuel costs or that our counterparties will be able to 
perform under our derivative contracts, such as in the case of a counterparty’s insolvency. In a falling fuel environment, we 
may be required to make cash payments to our counterparties which may impair our liquidity position and increase our costs. 

We rely on maintaining a high daily aircraft utilization rate to implement our low-cost structure, which makes us 
especially vulnerable to flight delays or cancellations or aircraft unavailability.

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We maintain a high daily aircraft utilization rate. Our average daily aircraft utilization was 11.6 hours for 2017, 12.4 

hours for 2016 and 12.7 hours for 2015. Aircraft utilization is the average amount of time per day that our aircraft spend 
carrying passengers. Our revenue per aircraft can be increased by high daily aircraft utilization, which is achieved in part by 
reducing turnaround times at airports so we can fly more hours on average in a day. Aircraft utilization is reduced by delays and 
cancellations from various factors, many of which are beyond our control, including air traffic congestion at airports or other 
air traffic control problems, adverse weather conditions, increased security measures or breaches in security, international or 
domestic conflicts, terrorist activity, or other changes in business conditions. A significant portion of our operations are 
concentrated in markets such as South Florida, the Caribbean, Latin America and the Northeast and northern Midwest regions 
of the United States, which are particularly vulnerable to weather, airport traffic constraints and other delays. In addition, 
pulling aircraft out of service for unscheduled and scheduled maintenance, the occurrence of which will increase as our fleet 
ages, may materially reduce our average fleet utilization and require that we seek short-term substitute capacity at increased 
costs. Due to the relatively small size of our fleet and high daily aircraft utilization rate, the unavailability of one or more 
aircraft and resulting reduced capacity could have a material adverse effect on our business, results of operations and financial 
condition.

Our maintenance costs will increase as our fleet ages, and we will periodically incur substantial maintenance costs due 
to the maintenance schedules of our aircraft fleet.

As of December 31, 2017, the average age of our aircraft was approximately 5.1 years. Our relatively new aircraft require 

less maintenance now than they will in the future. Our fleet will require more maintenance as it ages and our maintenance and 
repair expenses for each of our aircraft will be incurred at approximately the same intervals. For our leased aircraft, we expect 
that the final heavy maintenance events will be amortized over the remaining lease term rather than until the next estimated 
heavy maintenance event, because we account for heavy maintenance under the deferral method. This will result in 
significantly higher depreciation and amortization expense related to heavy maintenance in the last few years of the leases as 
compared to the costs in earlier periods. Moreover, because our current fleet was acquired over a relatively short period, 
significant maintenance that is scheduled on each of these planes is occurring at roughly the same time, meaning we will incur 
our most expensive scheduled maintenance obligations, known as heavy maintenance, across our present fleet around the same 
time. These more significant maintenance activities result in out-of-service periods during which our aircraft are dedicated to 
maintenance activities and unavailable to fly revenue service. In addition, the terms of some of our lease agreements require us 
to pay maintenance reserves to the lessor in advance of the performance of major maintenance, resulting in our recording 
significant prepaid deposits on our balance sheet. Depending on their recoverability, these maintenance reserves may be 
classified as supplemental rent. We expect scheduled and unscheduled aircraft maintenance expenses to increase over the next 
several years. Any significant increase in maintenance and repair expenses would have a material adverse effect on our 
business, results of operations and financial condition. Please see “Management’s Discussion and Analysis of Financial 
Condition and Results of Operations—Critical Accounting Policies and Estimates—Aircraft Maintenance, Materials and Repair 
Costs and Heavy Maintenance Amortization” and “—Maintenance Reserves.”

Our lack of marketing alliances could harm our business.

Many airlines, including the domestic traditional network airlines (American, Delta and United) have marketing alliances 

with other airlines, under which they market and advertise their status as marketing alliance partners. These alliances, such as 
OneWorld, SkyTeam and Star Alliance, generally provide for code-sharing, frequent flier program reciprocity, coordinated 
scheduling of flights to permit convenient connections and other joint marketing activities. Such arrangements permit an airline 
to market flights operated by other alliance members as its own. This increases the destinations, connections and frequencies 
offered by the airline and provides an opportunity to increase traffic on that airline’s segment of flights connecting with alliance 
partners. We currently do not have any alliances with U.S. or foreign airlines. Our lack of marketing alliances puts us at a 
competitive disadvantage to traditional network carriers who are able to attract passengers through more widespread alliances, 
particularly on international routes, and that disadvantage may result in a material adverse effect on our passenger traffic, 
business, results of operations and financial condition.

We are subject to extensive and increasing regulation by the FAA, DOT, TSA and other U.S. and foreign governmental 
agencies, compliance with which could cause us to incur increased costs and adversely affect our business and financial 
results.

Airlines are subject to extensive and increasing regulatory and legal compliance requirements, both domestically and 
internationally, that involve significant costs. In the last several years, Congress has passed laws, and the DOT, FAA and TSA 
have issued regulations, relating to the operation of airlines that have required significant expenditures. We expect to continue 
to incur expenses in connection with complying with government regulations. Additional laws, regulations, taxes and increased 
airport rates and charges have been proposed from time to time that could significantly increase the cost of airline operations or 

20

 
reduce the demand for air travel. If adopted, these measures could have the effect of raising ticket prices, reducing revenue and 
increasing costs. 

DOT has been aggressive in enforcing regulations for violations of the tarmac delay rules, passenger with disability 

rules, advertising rules and other consumer protection rules that could increase the cost of airline operations or reduce revenues. 
Additional rules on providing scheduling, fare and fee information to travel agents and metasearch sites may be issued in the 
future. Additional disability rules may be proposed, including with respect to access to lavatories on single-aisle aircraft. In 
addition, during 2014, the FAA issued its final regulations governing pilot rest periods and work hours for all airlines 
certificated under Part 121 of the Federal Aviation Regulations. The rule known as FAR 117, which became effective January 4, 
2014, impacted the required amount and timing of rest periods for pilots between work assignments and modifies duty and rest 
requirements based on the time of day, number of scheduled segments, flight types, time zones and other factors. Compliance 
with these rules may increase our costs, while failure to remain in full compliance with these rules may subject us to fines or 
other enforcement action.

In September 2017, Congress passed the Disaster Tax Relief and Airport Airway Extension Act of 2017, which 

extends FAA funds through March 31, 2018. Congress will be considering new FAA legislation in 2018 which may include 
reorganization of the air traffic control function and its funding mechanism. Congress may also consider imposing taxes on 
carry-on and checked bag fees which has been proposed in previous legislation. If Congress were to enact any new FAA 
reauthorization bill or similar legislation, it is uncertain what effect it could have on our results of operations and financial 
condition.

We cannot assure that these and other laws or regulations enacted in the future will not harm our business. In addition, 

the TSA mandates the federalization of certain airport security procedures and imposes additional security requirements on 
airports and airlines, most of which are funded by a per ticket tax on passengers and a tax on airlines. Prior to and for the first 
half of 2014, the passenger security fee was $2.50 per passenger flight segment, subject to a $5 per one-way trip cap. In July 
2014, the TSA implemented an increased passenger security fee at a flat rate of $5.60. On December 19, 2014, the law was 
amended to limit a round-trip fee to $11.20. We cannot forecast what additional security and safety requirements may be 
imposed in the future or the costs or revenue impact that would be associated with complying with such requirements.

Our ability to operate as an airline is dependent on our maintaining certifications issued to us by the DOT and the 

FAA. The FAA has the authority to issue mandatory orders relating to, among other things, the grounding of aircraft, inspection 
of aircraft, installation of new safety-related items and removal and replacement of aircraft parts that have failed or may fail in 
the future. A decision by the FAA to ground, or require time consuming inspections of or maintenance on, our aircraft, for any 
reason, could negatively affect our business and financial results. Federal law requires that air carriers operating large aircraft 
be continuously “fit, willing and able” to provide the services for which they are licensed. Our “fitness” is monitored by the 
DOT, which considers factors such as unfair or deceptive competition, advertising, baggage liability and disabled passenger 
transportation. While the DOT has seldom revoked a carrier's certification for lack of fitness, such an occurrence would render 
it impossible for us to continue operating as an airline. The DOT may also institute investigations or administrative proceedings 
against airlines for violations of regulations. 

The U.S. government is under persistent pressure to implement cost cutting and efficiency initiatives. In addition, the 

U.S. government has recently and may in the future experience delays in the completion of its budget process which could 
delay funding for government departments and agencies that regulate or otherwise are tied to the aviation industry, including 
the DOT and FAA. To the extent that any such initiatives or budgeting delays affect the operations of these government 
departments and agencies, including by forcing mandatory furloughs of government employees, our operations and results of 
operations could be materially adversely affected.

International routes are regulated by treaties and related agreements between the United States and foreign 
governments. Our ability to operate international routes is subject to change because the applicable arrangements between the 
United States and foreign governments may be amended from time to time. Our access to new international markets may be 
limited by our ability to obtain the necessary certificates to fly the international routes. In addition, our operations in foreign 
countries are subject to regulation by foreign governments and our business may be affected by changes in law and future 
actions taken by such governments, including granting or withdrawal of government approvals and restrictions on competitive 
practices. We are subject to numerous foreign regulations based on the large number of countries outside the United States 
where we currently provide service. If we are not able to comply with this complex regulatory regime, our business could be 
significantly harmed. Please see “Business — Government Regulation.”

Changes in legislation, regulation and government policy have affected, and may in the future have a material adverse 
effect on our business. 

21

 
 
 
 
 
 
 
Changes in, and uncertainty with respect to, legislation, regulation and government policy at the local, state or federal 
level have affected, and may in the future significantly impact, our business and the airline industry. For example, the Tax Cuts 
and Jobs Act, enacted on December 22, 2017, limits deductions for borrowers for net interest expense on debt. Specific 
legislative and regulatory proposals that could have a material impact on us in the future include, but are not limited to, 
infrastructure renewal programs; changes to immigration policy; modifications to international trade policy, including 
withdrawing from trade agreements and imposing tariffs; changes to financial legislation, including the partial or full repeal of 
the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, or Dodd-Frank Act; public company reporting 
requirements; environmental regulation and antitrust enforcement.  Any such changes may make it more difficult and/or more 
expensive for us to obtain new aircraft or engines and parts to maintain existing aircraft or engines or make it less profitable or 
prevent us from flying to or from some of the destinations we currently serve.

To the extent that any such changes have a negative impact on us or the airline industry, including as a result of related 
uncertainty, these changes may materially and adversely impact our business, financial condition, results of operations and cash 
flows.

We may not be able to implement our growth strategy.

Our growth strategy includes acquiring additional aircraft, increasing the frequency of flights and size of aircraft used in 

markets we currently serve, and expanding the number of markets we serve where our low cost structure would likely be 
successful. Effectively implementing our growth strategy is critical for our business to achieve economies of scale and to 
sustain or increase our profitability. We face numerous challenges in implementing our growth strategy, including our ability to:

•  maintain profitability;

• 

• 

• 

• 

• 

obtain financing to acquire new aircraft;

access airports located in our targeted geographic markets where we can operate routes in a manner that is consistent 
with our cost strategy;

obtain sufficient spare parts or related support services from our suppliers on a timely basis; 

gain access to international routes; and

access sufficient gates and other services at airports we currently serve or may seek to serve.

Our growth is dependent upon our ability to maintain a safe and secure operation and requires additional personnel, 
equipment and facilities. An inability to hire and retain personnel, timely secure the required equipment and facilities in a cost-
effective manner, efficiently operate our expanded facilities or obtain the necessary regulatory approvals may adversely affect 
our ability to achieve our growth strategy, which could harm our business. In addition, expansion to new markets may have 
other risks due to factors specific to those markets. We may be unable to foresee all of the existing risks upon entering certain 
new markets or respond adequately to these risks, and our growth strategy and our business may suffer as a result. In addition, 
our competitors may reduce their fares and/or offer special promotions to deter our entry into a new market or to stop our 
growth into existing markets or new markets. We cannot assure you that we will be able to profitably expand our existing 
markets or establish new markets.

Some of our target growth markets in the Caribbean and Latin America include countries with less developed economies 

that may be vulnerable to unstable economic and political conditions, such as significant fluctuations in gross domestic product, 
interest and currency exchange rates, high inflation, civil disturbances, government instability, nationalization and 
expropriation of private assets and the imposition of taxes or other charges by governments. The occurrence of any of these 
events in markets served by us and the resulting instability may adversely affect our ability to implement our growth strategy.

In 2008, in response to record high fuel prices and rapidly deteriorating economic conditions, we modified our growth 

plans by terminating our leases for seven aircraft. We incurred significant expenses relating to our lease terminations, and have 
incurred additional expenses to acquire new aircraft in place of those under the terminated leases as we expanded our network. 
We may in the future determine to reduce further our future growth plans from previously announced levels, which may impact 
our business strategy and future profitability.

We rely heavily on technology and automated systems to operate our business and any failure of these technologies or 
systems or failure by their operators could harm our business.

22

We are highly dependent on technology and automated systems to operate our business and achieve low operating costs. 

These technologies and systems include our computerized airline reservation system, flight operations system, financial 
planning, management and accounting system, telecommunications systems, website, maintenance systems and check-in 
kiosks. The performance and reliability of our technology are critical to our ability to operate and compete effectively. In 2015, 
our Board of Directors approved a significant technology upgrade initiative meant to address our aging IT infrastructure. This 
initiative will upgrade, replace, and enhance multiple older and outdated legacy systems and hardware. The execution of our 
strategic plans could be negatively affected by (i) our ability to timely and effectively implement, transition, and maintain 
related information technology systems and infrastructure; (ii) our ability to effectively balance its investment of incremental 
operating expenses and capital expenditures related to its strategies against the need to effectively control cost; and (iii) our 
dependence on third parties with respect to its ability to implement its strategic plans. We cannot assure you that our security 
measures, change control procedures, and disaster recovery plans will be adequate to prevent disruptions or delays. Disruption 
in or changes to these systems could result in an interruption to our operations or loss of important data. Any of the foregoing 
could result in a material adverse effect on our business, reputation, results of operations and financial condition.

 In order for our operations to work efficiently, our website and reservation system must be able to accommodate a high 
volume of traffic, maintain secure information and deliver flight information with a high degree of reliability. Substantially all 
of our tickets are issued to passengers as electronic tickets. We depend on our reservation system, which is hosted and 
maintained under a long-term contract by a third-party service provider, to be able to issue, track and accept these electronic 
tickets. If our reservation system fails or experiences interruptions, and we are unable to book seats for any period of time, we 
could lose a significant amount of revenue as customers book seats on competing airlines. We have experienced short duration 
reservation system outages from time to time and may experience similar outages in the future. For example, in November 
2010, we experienced a significant service outage with our third-party reservation service provider on the day before 
Thanksgiving, one of the industry’s busiest travel days and in August 2013, we experienced another 13 hour outage that 
affected our sales and customer service response times. We also rely on third-party service providers of our other automated 
systems for technical support, system maintenance and software upgrades. If our automated systems are not functioning or if 
the current providers were to fail to adequately provide technical support or timely software upgrades for any one of our key 
existing systems, we could experience service disruptions, which could harm our business and result in the loss of important 
data, increase our expenses and decrease our revenues. In the event that one or more of our primary technology or systems’ 
vendors goes into bankruptcy, ceases operations or fails to perform as promised, replacement services may not be readily 
available on a timely basis, at competitive rates or at all and any transition time to a new system may be significant.

In addition, our automated systems cannot be completely protected against events that are beyond our control, including 

natural disasters, cyber attacks or telecommunications failures. Substantial or sustained system failures could cause service 
delays or failures and result in our customers purchasing tickets from other airlines. We have implemented security measures 
and change control procedures and have disaster recovery plans; however, we cannot assure you that these measures are 
adequate to prevent disruptions. Disruption in, changes to or a breach of, these systems could result in a disruption to our 
business and the loss of important data. Moreover, in the event of system outages or interruptions, we may not be able to 
recover from our information technology and software providers all or any portion of the costs or business losses we may incur. 
Any of the foregoing could result in a material adverse effect on our business, results of operations and financial condition.

We are subject to cyber security risks and may incur increasing costs in an effort to minimize those risks.

Our business employs systems and websites that allow for the secure storage and transmission of proprietary or 
confidential information regarding our customers, employees, suppliers and others, including personal identification 
information, credit card data and other confidential information. Security breaches could expose us to a risk of loss or misuse of 
this information, litigation and potential liability. Although we take steps to secure our management information systems, and 
although multiple auditors review and approve the security configurations and management processes of these systems, 
including our computer systems, intranet and internet sites, email and other telecommunications and data networks, the security 
measures we have implemented may not be effective, and our systems may be vulnerable to theft, loss, damage and interruption 
from a number of potential sources and events, including unauthorized access or security breaches, natural or man-made 
disasters, cyber attacks, computer viruses, power loss, or other disruptive events.  We may not have the resources or technical 
sophistication to anticipate or prevent rapidly evolving types of cyber attacks. Attacks may be targeted at us, our customers and 
suppliers, or others who have entrusted us with information. In addition, attacks not targeted at us, but targeted solely at 
suppliers, may cause disruption to our computer systems or a breach of the data that we maintain on customers, employees, 
suppliers and others.  

Actual or anticipated attacks may cause us to incur increasing costs, including costs to deploy additional personnel and 
protection technologies, train employees and engage third-party experts and consultants, or costs incurred in connection with 
the notifications to employees, suppliers or the general public as part of our notification obligations to the various governments 
that govern our business. Advances in computer capabilities, new technological discoveries, or other developments may result 
23

in the breach or compromise of technology used by us to protect transaction or other data. In addition, data and security 
breaches can also occur as a result of non-technical issues, including breaches by us or by persons with whom we have 
commercial relationships that result in the unauthorized release of personal or confidential information. Our reputation, brand 
and financial condition could be adversely affected if, as a result of a significant cyber event or other security issues: our 
operations are disrupted or shut down; our confidential, proprietary information is stolen or disclosed; we incur costs or are 
required to pay fines in connection with stolen customer, employee or other confidential information; we must dedicate 
significant resources to system repairs or increase cyber security protection; or we otherwise incur significant litigation or other 
costs.

Our processing, storage, use and disclosure of personal data could give rise to liabilities as a result of governmental 
regulation.

In the processing of our customer transactions, we receive, process, transmit and store a large volume of identifiable 

personal data, including financial data such as credit card information. This data is increasingly subject to legislation and 
regulation, such as the Fair Accurate Credit Transparency Act and Payment Card Industry legislation, typically intended to 
protect the privacy of personal data that is collected, processed and transmitted. More generally, we rely on consumer 
confidence in the security of our system, including our website on which we sell the majority of our tickets. Our business, 
results of operations and financial condition could be adversely affected if we are unable to comply with existing privacy 
obligations or legislation or regulations are expanded to require changes in our business practices.

We may not be able to maintain or grow our non-ticket revenues.

Our business strategy includes expanding our portfolio of ancillary products and services. There can be no assurance that 

passengers will pay for additional ancillary products and services or that passengers will continue to choose to pay for the 
ancillary products and services we currently offer. Further, regulatory initiatives could adversely affect ancillary revenue 
opportunities. Failure to maintain our non-ticket revenues would have a material adverse effect on our results of operations and 
financial condition. Furthermore, if we are unable to maintain and grow our non-ticket revenues, we may not be able to execute 
our strategy to continue to lower base fares to address an underserved market. Please see “—Restrictions on or increased taxes 
applicable to charges for ancillary products and services paid by airline passengers and burdensome consumer protection 
regulations or laws could harm our business, results of operations and financial condition.”

Our inability to expand or operate reliably or efficiently out of our key airports where we maintain a large presence 
could have a material adverse effect on our business, results of operations and financial condition.

We are highly dependent on markets served from airports where we maintain a large presence. Our results of operations 

may be affected by actions taken by governmental or other agencies or authorities having jurisdiction over our operations at 
airports, including, but not limited to:

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

increases in airport rates and charges;

limitations on take-off and landing slots, airport gate capacity or other use of airport facilities;

termination of our airport use agreements, some of which can be terminated by airport authorities with little notice to 
us;

increases in airport capacity that could facilitate increased competition;

international travel regulations such as customs and immigration;

increases in taxes;

changes in the law that affect the services that can be offered by airlines in particular markets and at particular 
airports;

restrictions on competitive practices;

the adoption of statutes or regulations that impact customer service standards, including security standards; and

the adoption of more restrictive locally-imposed noise regulations or curfews.

In general, any changes in airport operations could have a material adverse effect on our business, results of operations 

and financial condition.

24

We rely on third-party service providers to perform functions integral to our operations.

We have entered into agreements with third-party service providers to furnish certain facilities and services required for 
our operations, including ground handling, catering, passenger handling, engineering, maintenance, refueling, reservations and 
airport facilities as well as administrative and support services. We are likely to enter into similar service agreements in new 
markets we decide to enter, and there can be no assurance that we will be able to obtain the necessary services at acceptable 
rates.

Although we seek to monitor the performance of third parties that provide us with our reservation system, ground 
handling, catering, passenger handling, engineering, maintenance services, refueling and airport facilities, the efficiency, 
timeliness and quality of contract performance by third-party service providers are often beyond our control, and any failure by 
our service providers to perform their contracts may have an adverse impact on our business and operations. For example, in 
2008, our call center provider went bankrupt. Though we were able to quickly switch to an alternative vendor, we experienced 
a significant business disruption during the transition period and a similar disruption could occur in the future if we changed 
call center providers or if an existing provider ceased to be able to serve us. We expect to be dependent on such third-party 
arrangements for the foreseeable future.

We rely on third-party distribution channels to distribute a portion of our airline tickets.

We rely on third-party distribution channels, including those provided by or through global distribution systems, or GDSs, 

conventional travel agents and online travel agents, or OTAs, to distribute a portion of our airline tickets, and we expect in the 
future to rely on these channels to an increasing extent to collect ancillary revenues. These distribution channels are more 
expensive and at present have less functionality in respect of ancillary revenues than those we operate ourselves, such as our 
call centers and our website. Certain of these distribution channels also effectively restrict the manner in which we distribute 
our products generally. To remain competitive, we will need to successfully manage our distribution costs and rights, and 
improve the functionality of third-party distribution channels, while maintaining an industry-competitive cost structure. 
Negotiations with key GDSs and OTAs designed to manage our costs, increase our distribution flexibility, and improve 
functionality could be contentious, could result in diminished or less favorable distribution of our tickets, and may not provide 
the functionality we require to maximize ancillary revenues. Any inability to manage our third-party distribution costs, rights 
and functionality at a competitive level or any material diminishment in the distribution of our tickets could have a material 
adverse effect on our competitive position and our results of operations. Moreover, our ability to compete in the markets we 
serve may be threatened by changes in technology or other factors that may make our existing third-party sales channels 
impractical, uncompetitive, or obsolete.

We rely on a single service provider to manage our fuel supply.

As of December 31, 2017, we had a single fuel service contract with World Fuel Services Corporation to manage the 
sourcing and contracting of our fuel supply. A failure by this provider to fulfill its obligations could have a material adverse 
effect on our business, results of operations and financial condition.

Our reputation and business could be materially adversely affected in the event of an emergency, accident or similar 
incident involving our aircraft.

We are exposed to potential significant losses in the event that any of our aircraft is subject to an emergency, accident, 

terrorist incident or other similar incident, and significant costs related to passenger claims, repairs or replacement of a 
damaged aircraft and its temporary or permanent loss from service. There can be no assurance that we will not be affected by 
such events or that the amount of our insurance coverage will be adequate in the event such circumstances arise and any such 
event could cause a substantial increase in our insurance premiums. Please see “—Increases in insurance costs or significant 
reductions in coverage could have a material adverse effect on our business, financial condition and results of operations.” In 
addition, any future aircraft emergency, accident or similar incident, even if fully covered by insurance or even if it does not 
involve our airline, may create a public perception that our airline or the equipment we fly is less safe or reliable than other 
transportation alternatives, or could cause us to perform time consuming and costly inspections on our aircraft or engines which 
could have a material adverse effect on our business, results of operations and financial condition.

Negative publicity regarding our customer service or otherwise could have a material adverse effect on our business.

In the past, we have experienced a relatively high number of customer complaints related to, among other things, our 

customer service and reservations and ticketing systems. In particular, we generally experience a higher volume of complaints 
when we make changes to our unbundling policies, such as charging for baggage. In addition, in 2009, we entered into a 
consent order with the DOT for our procedures for bumping passengers from oversold flights and our handling of lost or 
damaged baggage. Under the consent order, we were assessed a civil penalty of $375,000, of which we were required to pay 

25

$215,000 based on an agreement with the DOT and not having similar violations in the year after the date of the consent order. 
Further, media reports about incidents on our aircraft unrelated to customer complaints could negatively impact our reputation 
and our operations. If we do not meet our customers' expectations with respect to reliability and service, customers could 
decide not to fly with us, which would materially adversely affect our business and reputation.

We depend on a limited number of suppliers for our aircraft and engines.

One of the elements of our business strategy is to save costs by operating a single-family aircraft fleet - currently Airbus 

A320-family, single-aisle aircraft, powered by engines manufactured by IAE and Pratt & Whitney. If any of Airbus, IAE, or 
Pratt & Whitney become unable to perform its contractual obligations, or if we are unable to acquire or lease aircraft or engines 
from these or other owners, operators or lessors on acceptable terms, we would have to find other suppliers for a similar type of 
aircraft or engine. If we have to lease or purchase aircraft from another supplier, we would lose the significant benefits we 
derive from our current single fleet composition. We may also incur substantial transition costs, including costs associated with 
retraining our employees, replacing our manuals and adapting our facilities and maintenance programs. Our operations could 
also be harmed by the failure or inability of aircraft, engine and parts suppliers to provide sufficient spare parts or related 
support services on a timely basis, particularly in connection with new-generation introductory technology. Our business would 
be significantly harmed if a design defect or mechanical problem with any of the types of aircraft, engines or components 
currently on order or that we operate were discovered that would halt or delay our aircraft delivery stream or that would ground 
any of our aircraft while the defect or problem was corrected, assuming it could be corrected at all. For example, during the 
fourth quarter of 2016, and continuing through 2017, introductory issues with the new-generation PW1100G-JM engines, 
designed and manufactured by Pratt & Whitney, resulted in the intermittent grounding of certain of our A320neo aircraft. As of 
February 2018, however, all five of our A320neo aircraft are fully operational. Additionally, in January 2018, we extended a 
previously executed engine support agreement with Pratt & Whitney to continue securing support and relief in connection with 
possible engine related operational disruptions. In part, due to issues involving the new engine, we have renegotiated certain 
aspects of our aircraft delivery schedule. We originally had four A320neos scheduled for delivery in 2018 of which two were 
converted to A320ceo aircraft, and delivered in 2017, and the remaining two were deferred until 2019. In January 2018, we also 
amended our 2019 order to convert five of our 2019 A320neo aircraft to A320ceo aircraft. We cannot be certain that the new 
generation PW1100G-JM issues will be corrected or if the defect will require the grounding of any of our A320neos. These 
types of events, if appropriate design or mechanical modifications cannot be adequately implemented, could materially 
adversely affect our business, results of operations and financial condition. Moreover, the use of our aircraft could be 
suspended or restricted by regulatory authorities in the event of actual or perceived mechanical or design problems. Our 
business would also be significantly harmed if the public began to avoid flying with us due to an adverse perception of the 
types of aircraft, engines or components that we operate stemming from safety concerns or other problems, whether real or 
perceived, or in the event of an accident involving those types of aircraft, engines or components. Carriers that operate a more 
diversified fleet are better positioned than we are to manage such events.

Reduction in demand for air transportation, or governmental reduction or limitation of operating capacity, in the 
domestic U.S., Caribbean or Latin American markets could harm our business, results of operations and financial 
condition.

A significant portion of our operations are conducted to and from the domestic U.S., Caribbean or Latin American 

markets. Our business, results of operations and financial condition could be harmed if we lost our authority to fly to these 
markets, by any circumstances causing a reduction in demand for air transportation, or by governmental reduction or limitation 
of operating capacity, in these markets, such as adverse changes in local economic or political conditions, negative public 
perception of these destinations, unfavorable weather conditions, public health concerns or terrorist related activities. 
Furthermore, our business could be harmed if jurisdictions that currently limit competition allow additional airlines to compete 
on routes we serve. Many of the countries we serve are experiencing either economic slowdowns or recessions, which may 
translate into a weakening of demand and could harm our business, results of operations and financial condition.

Increases in insurance costs or significant reductions in coverage could have a material adverse effect on our business, 
financial condition and results of operations.

We carry insurance for third-party liability, passenger liability, property damage and all-risk coverage for damage to our 
aircraft. As a result of the September 11, 2001 terrorist attacks, aviation insurers significantly reduced the amount of insurance 
coverage available to commercial air carriers for liability to persons other than employees or passengers for claims resulting 
from acts of terrorism, war or similar events (war risk insurance). Accordingly, our insurance costs increased significantly and 
our ability to continue to obtain certain types of insurance remains uncertain. While the price of commercial insurance has 
declined since the period immediately after the terrorist attacks, in the event commercial insurance carriers further reduce the 
amount of insurance coverage available to us, or significantly increase its cost, we would be adversely affected. We currently 
maintain commercial airline insurance with several underwriters. However, there can be no assurance that the amount of such 

26

coverage will not be changed, or that we will not bear substantial losses from accidents. We could incur substantial claims 
resulting from an accident in excess of related insurance coverage that could have a material adverse effect on our results of 
operations and financial condition. Renewing coverage may result in higher premiums and more restrictive terms. Our 
business, results of operations and financial condition could be materially adversely affected if we are unable to obtain 
adequate insurance. 

Failure to comply with applicable environmental regulations could have a material adverse effect on our business, 
results of operations and financial condition.

We are subject to increasingly stringent federal, state, local and foreign laws, regulations and ordinances relating to the 

protection of the environment, including those relating to emissions to the air, discharges to surface and subsurface waters, safe 
drinking water and the management of hazardous substances, oils and waste materials. Compliance with all environmental laws 
and regulations can require significant expenditures and any future regulatory developments in the United States and abroad 
could adversely affect operations and increase operating costs in the airline industry. For example, climate change legislation 
was previously introduced in Congress and such legislation could be re-introduced in the future by Congress and state 
legislatures, and could contain provisions affecting the aviation industry, compliance with which could result in the creation of 
substantial additional costs to us. Similarly, the Environmental Protection Agency issued a rule that regulates larger emitters of 
greenhouse gases. Future operations and financial results may vary as a result of such regulations. Compliance with these 
regulations and new or existing regulations that may be applicable to us in the future could increase our cost base and could 
have a material adverse effect on our business, results of operations and financial condition.

Governmental authorities in several U.S. and foreign cities are also considering or have already implemented aircraft 
noise reduction programs, including the imposition of nighttime curfews and limitations on daytime take-offs and landings. We 
have been able to accommodate local noise restrictions imposed to date, but our operations could be adversely affected if 
locally-imposed regulations become more restrictive or widespread.

If we are unable to attract and retain qualified personnel or fail to maintain our company culture, our business, results 
of operations and financial condition could be harmed.

Our business is labor intensive. We require large numbers of pilots, flight attendants, maintenance technicians and other 

personnel. The airline industry has from time to time experienced a shortage of qualified personnel, particularly with respect to 
pilots and maintenance technicians. In addition, we may face high employee turnover. We may be required to increase wages 
and/or benefits in order to attract and retain qualified personnel. If we are unable to hire, train and retain qualified employees, 
our business could be harmed and we may be unable to implement our growth plans.

In addition, as we hire more people and grow, we believe it may be increasingly challenging to continue to hire people 

who will maintain our company culture. Our company culture, which we believe is one of our competitive strengths, is 
important to providing high-quality customer service and having a productive, accountable workforce that helps keep our costs 
low. As we continue to grow, we may be unable to identify, hire or retain enough people who meet the above criteria, including 
those in management or other key positions. Our company culture could otherwise be adversely affected by our growing 
operations and geographic diversity. If we fail to maintain the strength of our company culture, our competitive ability and our 
business, results of operations and financial condition could be harmed.

Our business, results of operations and financial condition could be materially adversely affected if we lose the services 
of our key personnel.

Our success depends to a significant extent upon the efforts and abilities of our senior management team and key 
financial and operating personnel. In particular, we depend on the services of our senior management team. Competition for 
highly qualified personnel is intense, and the loss of any executive officer, senior manager, or other key employee without 
adequate replacement or the inability to attract new qualified personnel could have a material adverse effect on our business, 
results of operations and financial condition. We do not maintain key-person life insurance on our management team.

The requirements of being a public company may strain our resources, divert management’s attention and affect our 
ability to attract and retain qualified board members.

As a public company, we incur significant legal, accounting and other expenses, including costs associated with public 
company reporting requirements. We also have incurred and will continue to incur costs associated with the Sarbanes-Oxley 
Act of 2002, as amended, the Dodd-Frank Wall Street Reform and Consumer Protection Act and related rules implemented or 
to be implemented by the SEC and the New York Stock Exchange. The expenses incurred by public companies generally for 
reporting and corporate governance purposes have been increasing. We expect these rules and regulations to increase our legal 
and financial compliance costs and to make some activities more time-consuming and costly. These laws and regulations could 

27

also make it more difficult or costly for us to obtain certain types of insurance, including director and officer liability insurance, 
and we may be forced to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or 
similar coverage. These laws and regulations could also make it more difficult for us to attract and retain qualified persons to 
serve on our board of directors, our board committees, or as our executive officers and may divert management’s attention. 
Furthermore, if we are unable to satisfy our obligations as a public company, we could be subject to delisting of our common 
stock, fines, sanctions and other regulatory action and potentially civil litigation.

We are required to assess our internal control over financial reporting on an annual basis, and any future adverse 
findings from such assessment could result in a loss of investor confidence in our financial reports, significant expenses 
to remediate any internal control deficiencies, and ultimately have an adverse effect on the market price of our common 
stock.

Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002, as amended, our management is required to report on, and 
our independent registered public accounting firm is required to attest to, the effectiveness of our internal control over financial 
reporting. The rules governing the standards that must be met for management to assess our internal control over financial 
reporting are complex and require significant documentation, testing and possible remediation. Annually, we perform activities 
that include reviewing, documenting and testing our internal control over financial reporting. During the performance of these 
activities, we may encounter problems or delays in completing the implementation of any changes necessary to make a 
favorable assessment of our internal control over financial reporting. In connection with the attestation process by our 
independent registered public accounting firm, we may encounter problems or delays in completing the implementation of any 
requested improvements and receiving a favorable attestation. In addition, if we fail to maintain the adequacy of our internal 
control over financial reporting we will not be able to conclude on an ongoing basis that we have effective internal control over 
financial reporting in accordance with Section 404.  If we fail to achieve and maintain an effective internal control 
environment, we could suffer material misstatements in our financial statements and fail to meet our reporting obligations, 
which would likely cause investors to lose confidence in our reported financial information. This could harm our operating 
results and lead to a decline in our stock price. Additionally, ineffective internal control over financial reporting could expose 
us to increased risk of fraud or misuse of corporate assets and subject us to potential delisting from the New York Stock 
Exchange, regulatory investigations, civil or criminal sanctions and class action litigation.

The market price of our common stock may be volatile, which could cause the value of an investment in our stock to 
decline.

The market price of our common stock may fluctuate substantially due to a variety of factors, many of which are beyond 

our control, including:

• 

• 

• 

announcements concerning our competitors, the airline industry or the economy in general;

strategic actions by us or our competitors, such as acquisitions or restructurings;

increased price competition;

•  media reports and publications about the safety of our aircraft or the aircraft type we operate;

• 

• 

• 

• 

• 

• 

• 

• 

new regulatory pronouncements and changes in regulatory guidelines;

changes in the price of aircraft fuel;

announcements concerning the availability of the type of aircraft we use;

general and industry-specific economic conditions;

changes in financial estimates or recommendations by securities analysts or failure to meet analysts’ performance 
expectations;

sales of our common stock or other actions by investors with significant shareholdings;

trading strategies related to changes in fuel or oil prices; and

general market, political and economic conditions.

The stock markets in general have experienced substantial volatility that has often been unrelated to the operating 
performance of particular companies. These types of broad market fluctuations may adversely affect the trading price of our 
common stock.

28

In the past, stockholders have sometimes instituted securities class action litigation against companies following periods 

of volatility in the market price of their securities. Any similar litigation against us could result in substantial costs, divert 
management’s attention and resources and harm our business or results of operations.

If securities or industry analysts do not publish research or reports about our business, or publish negative reports 
about our business, our stock price and trading volume could decline.

The trading market for our common stock depends in part on the research and reports that securities or industry analysts 

publish about us or our business. If one or more of the analysts who cover us downgrade our stock or publish inaccurate or 
unfavorable research about our business, our stock price would likely decline. If one or more of these analysts cease coverage 
of our company or fail to publish reports on us regularly, demand for our stock could decrease, which might cause our stock 
price and trading volume to decline.

Our anti-takeover provisions may delay or prevent a change of control, which could adversely affect the price of our 
common stock.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that may 

make it difficult to remove our board of directors and management and may discourage or delay “change of control” 
transactions, which could adversely affect the price of our common stock. These provisions include, among others:

• 

• 

• 

• 

• 

our board of directors is divided into three classes, with each class serving for a staggered three-year term, which 
prevents stockholders from electing an entirely new board of directors at an annual meeting;

actions to be taken by our stockholders may only be effected at an annual or special meeting of our stockholders and 
not by written consent;

special meetings of our stockholders can be called only by the Chairman of the Board or by our corporate secretary at 
the direction of our board of directors;

advance notice procedures that stockholders must comply with in order to nominate candidates to our board of 
directors and propose matters to be brought before an annual meeting of our stockholders may discourage or deter a 
potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise 
attempting to obtain control of our company; and

our board of directors may, without stockholder approval, issue series of preferred stock, or rights to acquire preferred 
stock, that could dilute the interest of, or impair the voting power of, holders of our common stock or could also be 
used as a method of discouraging, delaying or preventing a change of control.

Our corporate charter and bylaws include provisions limiting voting by non-U.S. citizens and specifying an exclusive 
forum for stockholder disputes.

To comply with restrictions imposed by federal law on foreign ownership of U.S. airlines, our amended and restated 

certificate of incorporation and amended and restated bylaws restrict voting of shares of our common stock by non-U.S. 
citizens. The restrictions imposed by federal law currently require that no more than 25% of our stock be voted, directly or 
indirectly, by persons who are not U.S. citizens, and that our president and at least two-thirds of the members of our board of 
directors and senior management be U.S. citizens. Our amended and restated bylaws provide that the failure of non-U.S. 
citizens to register their shares on a separate stock record, which we refer to as the “foreign stock record,” would result in a 
suspension of their voting rights in the event that the aggregate foreign ownership of the outstanding common stock exceeds the 
foreign ownership restrictions imposed by federal law.

Our amended and restated bylaws further provide that no shares of our common stock will be registered on the foreign 

stock record if the amount so registered would exceed the foreign ownership restrictions imposed by federal law. If it is 
determined that the amount registered in the foreign stock record exceeds the foreign ownership restrictions imposed by federal 
law, shares will be removed from the foreign stock record in reverse chronological order based on the date of registration 
therein, until the number of shares registered therein does not exceed the foreign ownership restrictions imposed by federal law. 
As of December 31, 2017, we believe we were in compliance with the foreign ownership rules.

As of December 31, 2017, there are no shares of non-voting common stock outstanding. When shares of non-voting 
common stock are outstanding, the holders of such stock may convert such shares, on a share-for-share basis, in the order 
reflected on our foreign stock record as shares of common stock are sold or otherwise transferred by non-U.S. citizens to U.S. 
citizens. 

29

Our amended and restated certificate of incorporation also specifies that the Court of Chancery of the State of Delaware 

shall be the exclusive forum for substantially all disputes between us and our stockholders. 

We do not intend to pay cash dividends for the foreseeable future.

We have never declared or paid cash dividends on our common stock. We currently intend to retain our future earnings, if 
any, to finance the further development and expansion of our business and fund share repurchases under programs approved by 
our Board of Directors. We do not intend to pay cash dividends in the foreseeable future. Any future determination to pay 
dividends will be at the discretion of our board of directors and will depend on our financial condition, results of operations, 
capital requirements, restrictions contained in current or future financing instruments, business prospects and such other factors 
as our Board of Directors deems relevant. The timing of any share repurchases under share repurchase programs will depend 
upon market conditions, our capital allocation strategy and other factors.

30

ITEM 1B. 

UNRESOLVED STAFF COMMENTS

None.

ITEM 2. 

PROPERTIES

Aircraft

As of December 31, 2017, we operated a fleet of 112 aircraft as detailed in the following table: 

Aircraft Type

A319

A320ceo

A320neo

A321

Seats

145

178 - 182

182

228

Average Age
(years)

Number of
Aircraft

Number
Owned

Number
Leased

10.9

3.9

1.1

1.2
5.1

31

51

5

25
112

8

21

—

25
54

23

30

5

—
58

As of December 31, 2017, our firm aircraft orders consisted of 59 A320 family aircraft with Airbus (6 A320ceos, 48 
A320neos, and 5 A321ceos). As of December 31, 2017, our future fleet plan, net of contractual lease returns, is illustrated in the 
table below.  

Aircraft Type

2018

2019

2020

2021

2022

A319

A320ceo

A320neo

A321
Total Aircraft

31

56

5

30
122

31

57

19

30
137

26

57

35

30
148

21

57

53

30
161

12

53

53

30
148

Note 1: Actual fleet count may differ depending on future fleet decisions, including actual lease retirements.

During the first quarter of 2018, we negotiated revisions to our A320 aircraft order. We originally had 14 A320neo aircraft 

scheduled for delivery in 2019. Pursuant to the revision, 5 of the 14 scheduled A320neo aircraft were converted to A320ceo 
aircraft but remain scheduled to be delivered in 2019. We also have four spare engine orders for V2500 SelectTwo engines with 
IAE and nine spare engine orders for PurePower PW 1100G-JM engines with Pratt & Whitney. Spare engines are scheduled for 
delivery from 2018 through 2023.

Ground Facilities 

We lease all of our facilities at each of the airports we serve, with the exception of our newly constructed aircraft hangar 

in Detroit, which we own. Our leases for terminal passenger service facilities, which include ticket counter and gate space, 
operations support areas and baggage service offices, generally have a term ranging from month-to-month to 16 years, and 
contain provisions for periodic adjustments of lease rates. We also are responsible for maintenance, insurance and other facility-
related expenses and services. We also have entered into use agreements at the airports we serve that provide for the non-
exclusive use of runways, taxiways and other airfield facilities. Landing fees paid under these agreements are based on the 
number of landings and weight of the aircraft.

As of December 31, 2017, Ft. Lauderdale/Hollywood International Airport (FLL) remained our single largest airport 

served, with approximately 26% of our capacity operating from FLL during 2017. We operate primarily out of Terminal 4 at 
FLL, the international terminal. We currently use up to ten gates simultaneously at Terminal 3 and Terminal 4. We have 
preferential access to seven of the Terminal 4 gates, common use access to the remaining three Terminal 4 gates, and access to 
other Terminal 3 gates.  FLL is in the middle of a concourse replacement and expansion project, which will expand the number 
of gates at Terminal 4 from 10 to 14. Other airports through which we conduct significant operations include McCarran 
International Airport (LAS), Orlando International Airport (MCO), Chicago O'Hare International Airport (ORD), Detroit 
Metropolitan Wayne County Airport (DTW), Los Angeles International Airport (LAX) and Dallas/Fort Worth International 
Airport (DFW). 

31

 
Our largest maintenance facility is currently located in a leased facility at DTW under a lease that expires in September 

2032. We also conduct additional maintenance operations in leased facilities in Fort Lauderdale, Florida; Chicago, Illinois; 
Atlantic City, New Jersey; Dallas, Texas; Houston, Texas; Las Vegas, Nevada; Orlando, Florida; Atlanta, Georgia; Myrtle 
Beach, South Carolina; Fort Myers, Florida; and Philadelphia, Pennsylvania. 

In September 2015, we executed a lease agreement with Wayne County Airport Authority (the Authority), which owns 

and operates Detroit Metropolitan Wayne County Airport (DTW). Under the lease agreement, we lease a 10-acre site, adjacent 
to the airfield at DTW, in order to construct, operate and maintain an approximately 126,000-square-foot hangar facility (the 
project). The project allows for the development of a maintenance hangar in order to fulfill the requirements of our growing 
fleet and will reduce dependence on third-party facilities and contract line maintenance. The lease agreement has a 30-year 
term with two 10-year extension options. Upon termination of the lease, title of the project, which will be fully depreciated, 
will automatically pass to the Authority. We completed the project during the first quarter of 2017 and had no remaining capital 
commitments related to this project as of December 31, 2017.

Our principal executive offices and headquarters are located in a leased facility at 2800 Executive Way, Miramar, Florida 
33025, consisting of approximately 56,000 square feet. The lease for this facility expires in January 2025. In January 2014, we 
expanded our principal executive offices and headquarters by leasing an additional facility located at 2844 Corporate Way, 
Miramar, Florida 33025, consisting of approximately 15,000 square feet. The lease for this facility expires in January 2025. We 
also have a training center located in a leased facility at 1050 Lee Wagener Boulevard, Fort Lauderdale, Florida 33315, 
consisting of approximately 12,000 square feet, under a lease that expires in January 2020.

ITEM 3. 

LEGAL PROCEEDINGS

We are subject to commercial litigation claims and to administrative and regulatory proceedings and reviews that may be 
asserted or maintained from time to time. We believe the ultimate outcome of pending lawsuits, proceedings and reviews will 
not, individually or in the aggregate, have a material adverse effect on our financial position, liquidity, or results of operations.

ITEM 4. 

MINE SAFETY DISCLOSURES

Not applicable.

32

PART II

ITEM 5. 
AND ISSUER PURCHASES OF EQUITY SECURITIES

MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS 

Market Price of our common stock

Our common stock is listed and traded on the NYSE under the symbol "SAVE," as of December 28, 2017. Prior to this 
date, our stock traded on the NASDAQ under the symbol "SAVE." The following table shows, for the periods indicated, the 
high and low per share sales prices for our common stock. 

Fiscal year ended December 31, 2016

First Quarter
Second Quarter
Third Quarter
Fourth Quarter

Fiscal year ended December 31, 2017

First Quarter
Second Quarter
Third Quarter
Fourth Quarter

High

Low

$ 50.14
52.96
48.93
59.50

$ 36.53
39.37
37.23
42.12

$ 58.10
59.74
53.46
45.30

$ 49.53
50.90
32.09
33.47

As of February 1, 2018, there were approximately 93 holders of record of our common stock. Because many of our 
shares are held by brokers and other institutions on behalf of stockholders, we are unable to estimate the total number of 
stockholders represented by the holders.

The information under the caption “Equity Compensation Plan Information” in our 2018 Proxy Statement is incorporated 

herein by reference. 

Dividend Policy

We have never declared or paid, and do not anticipate declaring or paying, any cash dividends on our common stock. Any 

future determination as to the declaration and payment of dividends, if any, will be at the discretion of our board of directors 
and will depend on then existing conditions, including our financial condition, operating results, contractual restrictions, capital 
requirements, business prospects and other factors our board of directors may deem relevant.

33

Our Repurchases of Equity Securities

The following table reflects our repurchases of our common stock during the fourth quarter of 2017. Repurchases of 
equity securities during the period include repurchases made from employees who received restricted stock as well as open 
market repurchases made under our stock repurchase authorization that became effective October 2017, which authorized the 
repurchase of up to $100 million of our common stock. The authorization will expire on October 25, 2018. All employee stock 
repurchases were made at the election of each employee pursuant to an offer to repurchase by us. In each case, the shares 
repurchased constituted the portion of vested shares necessary to satisfy tax withholding requirements.

ISSUER PURCHASES OF EQUITY SECURITIES

Total
Number of
Shares
Purchased
(in
thousands)

Average
Price Paid
per Share

42,215

$

924,800

232,159

1,199,174

$

37.03

36.43

43.35

37.79

Total Number
of Shares
Purchased as
Part of Publicly
Announced
Plans or
Programs

Approximate
Dollar Value of
Shares that May
Yet be Purchased
Under Plans or
Programs

40,300

$

98,501,158

924,800

224,400

1,189,500

64,791,372

55,076,306

Period

October 1-31, 2017

November 1-30, 2017

December 1-31, 2017

Total

During the first three quarters of 2017, we repurchased 23 thousand shares for a total of $1.2 million. Repurchases of 
equity securities during this period include repurchases made from employees who received restricted stock or performance 
share awards. During the year ended December 31, 2017, we retired 3.9 million treasury shares in a total aggregate amount of 
$199.4 million. 

34

Stock Performance Graph

The following graph compares the cumulative total stockholder return on our common stock with the cumulative total 

return on the NASDAQ Composite Index and the NYSE ARCA Airline Index for the period beginning on December 31, 2012 
and ending on December 31, 2017. The graph assumes an investment of $100 in our stock and the two indices, respectively, on 
December 31, 2012, and further assumes the reinvestment of all dividends. Stock price performance, presented for the period 
from December 31, 2012 to December 31, 2017, is not necessarily indicative of future results.

12/31/2012 12/31/2013 12/31/2014 12/31/2015 12/31/2016 12/31/2017

Spirit . . . . . . . . . . . . . . . . . . . . $
NYSE ARCA Airline Index. . . $
NASDAQ Composite Index . . $

100.00 $

256.12 $

426.28 $

224.76 $

326.34 $

100.00 $

158.23 $

237.43 $

201.39 $

258.44 $

100.00 $

139.89 $

160.47 $

171.83 $

187.03 $

252.96

274.29

242.34

35

 
   
ITEM 6. 

SELECTED FINANCIAL DATA

You should read the following selected historical financial and operating data below in conjunction with “Management’s 
Discussion and Analysis of Financial Condition and Results of Operations” and the financial statements, related notes and other 
financial information included in this annual report. The selected financial data in this section are not intended to replace the 
financial statements and are qualified in their entirety by the financial statements and related notes included in this annual 
report.

We derived the selected statements of operations data for the years ended December 31, 2017, 2016 and 2015 and the 

balance sheet data as of December 31, 2017 and 2016 from our audited financial statements included in this annual report. We 
derived the selected statements of operations data for the years ended December 31, 2014 and 2013 and the balance sheet data 
as of December 31, 2015, 2014 and 2013 from our audited financial statements not included in this annual report. Our historical 
results are not necessarily indicative of the results to be expected in the future.

Year Ended December 31,

2017

2016

2015

2014

2013

(in thousands, except share and per share data)

Operating revenues:

Passenger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 1,366,034
Non-ticket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1,281,632

Total operating revenue

Operating expenses:

Aircraft fuel (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Salaries, wages and benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Aircraft rent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Landing fees and other rents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Depreciation and amortization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance, materials and repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Special charges (2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Loss on disposal of assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Other operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2,647,666

615,581

527,959

205,852

180,655

140,152

110,439

113,620

12,629

4,168

347,820

$ 1,200,621

$ 1,169,338

$ 1,144,972

$

986,018

1,121,335

2,321,956

972,125

786,608

668,367

2,141,463

1,931,580

1,654,385

447,553

472,471

201,675

151,679

101,136

98,587

96,627

37,189

4,187

461,447

377,508

211,531

131,077

73,908

80,448

86,576

673

1,604

612,909

313,409

195,827

105,115

46,971

73,956

74,823

45

3,008

551,746

261,624

169,737

83,604

31,947

60,143

67,481

174

525

267,191

207,569

150,254

145,112

Total operating expenses

Operating income

Other expense (income):

2,258,875

1,878,295

1,632,341

1,576,317

1,372,093

388,791

443,661

509,122

355,263

282,292

Interest expense (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Capitalized interest (4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interest income . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Other expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total other expense (income) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Income before income taxes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Provision (benefit) for income taxes (5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Net income

Earnings Per Share:

57,302

(13,793)

(8,736)

366

35,139

353,652

(66,954)

$

420,606

Basic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
Diluted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
Weighted average shares outstanding:

6.08

6.06

41,654

(12,705)

(5,276)

528

24,201

419,460

154,581

264,879

3.77

3.76

$

$

$

20,382

(11,553)

(2,125)

15

6,719

502,403

185,183

317,220

4.39

4.38

$

$

$

2,747

(2,747)

(336)

2,605

2,269

352,994

127,530

225,464

3.10

3.08

$

$

$

214

(214)

(401)

283

(118)

282,410

105,492

176,918

2.44

2.42

$

$

$

Basic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

69,220,750

70,343,935

72,207,725

72,738,961

72,592,765

Diluted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

69,376,930

70,507,596

72,426,060

73,293,869

72,999,221

(1) 

Aircraft fuel expense is the sum of (i) “into-plane fuel cost,” which includes the cost of jet fuel and certain other charges such as fuel taxes and oil, 
(ii) realized gains and losses related to fuel derivative contracts, if any, and (iii) unrealized gains and losses related to fuel derivative contracts, if 
any. The following table summarizes the components of aircraft fuel expense for the periods presented:

36

 
 
Year Ended December 31,

2017

2016

2015

2014

2013

(in thousands)

Into-plane fuel cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
Realized losses (gains) related to fuel derivatives contracts, net . . . . . . . . . . . . . .

Unrealized losses (gains) related to fuel derivative contracts, net . . . . . . . . . . . . .

615,581

$

447,553

$

454,747

$

608,033

$

542,523

—

—

—

—

10,580

(3,880)

995

3,881

8,958

265

Aircraft fuel expense. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $

615,581

$

447,553

$

461,447

$

612,909

$

551,746

(2) 

(3) 

(4) 

(5) 

Special charges include: (i) for 2013, costs related to the 2013 secondary offering of our common stock; (ii) for 2013 and 2014, $0.1 million in costs 
related to the DCA exit; (iii) for 2015, $0.7 million related to restructuring charges for outsourcing of ramps and passenger services; (iv) for 2016, 
$37.2 million related to lease termination charges recognized in connection with the purchase of 7 aircraft formerly financed under operating lease 
agreements; (v) for 2017, $12.6 million related to lease termination charges recognized in connection with the purchase of one engine and one 
aircraft formerly financed under operating lease agreements.
Interest expense in 2013 primarily relates to interest related to the Tax Receivable Agreement (TRA). Interest expense in 2014 primarily relates to 
interest related to the long-term debt, commitment fees and underpayment of Federal Excise Tax for fuel purchases during the period between July 
1, 2009 and August 31, 2014. Interest expense in 2015, 2016 and 2017 primarily relates to interest related to financing of purchasing aircraft.
Interest attributable to funds used to finance the acquisition of new aircraft, including PDPs is capitalized as an additional cost of the related asset. 
In 2015, 2016 and 2017, capitalized interest primarily represents interest related to the financing of purchased aircraft. 
During the fourth quarter of 2017, we recorded a non-recurring income tax benefit of $199.3 million ($2.87 per diluted share) due to the enactment 
of the Tax Cuts and Jobs Act of 2017.

The following table presents balance sheet data for the periods presented:

As of December 31,

2017

2016

2015

2014

2013

 Balance Sheet Data:

(in thousands)

Cash and cash equivalents. . . . . . . . . . . . . . . . . . . . . $
Short-term investment securities . . . . . . . . . . . . . . . .

800,849

$

700,900

$

803,632

$

632,784

$

530,631

100,937

100,155

—

—

—

Total assets (6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4,143,950

3,151,927

2,530,545

1,592,753

1,164,522

Long-term debt, including current portion . . . . . . . .

1,502,928

981,713

646,330

145,663

—

Stockholders' equity . . . . . . . . . . . . . . . . . . . . . . . . .

1,777,081

1,394,607

1,225,310

1,003,075

769,117

(6) 

Prior period amounts have been reclassified to conform to ASU No. 2015-17 (ASU 2015-17), "Income Taxes" issued in November 2015. 

37

 
Operating Statistics (unaudited) (A)

Average aircraft . . . . . . . . . . . . . . . . . . . . . .

Aircraft at end of period. . . . . . . . . . . . . . . .

Average daily aircraft utilization (hours) . . .

Average stage length (miles) . . . . . . . . . . . .

Block hours . . . . . . . . . . . . . . . . . . . . . . . . .

Departures . . . . . . . . . . . . . . . . . . . . . . . . . .

Passenger flight segments (thousands). . . . .

Revenue passenger miles (RPMs)
(thousands) . . . . . . . . . . . . . . . . . . . . . . . . . .
Available seat miles (ASMs) (thousands) . .

Load factor (%) . . . . . . . . . . . . . . . . . . . . . .

Average ticket revenue per passenger flight
segment ($). . . . . . . . . . . . . . . . . . . . . . . . . .
Average non-ticket revenue per passenger
flight segment ($) . . . . . . . . . . . . . . . . . . . . .
Total revenue per passenger segment ($). . .

Average yield (cents) . . . . . . . . . . . . . . . . . .

Total operating revenue per ASM 
(TRASM) (cents) . . . . . . . . . . . . . . . . . . . . .

CASM (cents). . . . . . . . . . . . . . . . . . . . . . . .

Adjusted CASM (cents) (B). . . . . . . . . . . . .

Adjusted CASM ex fuel (cents) (C). . . . . . .

OPERATING STATISTICS

Year Ended December 31,

2017

2016

2015

2014

2013

103.6

112

11.6

999

438,728

165,449

24,183

86.2

95

12.4

979

389,914

149,514

21,618

72.7

79

12.7

987

337,956

128,902

17,921

57.7

65

12.7

980

267,305

102,594

14,294

49.9

54

12.7

958

231,148

90,284

12,414

24,605,512

21,581,611

17,995,311

14,159,860

12,001,088

29,592,819

25,494,645

21,246,156

16,340,142

13,861,393

83.1

56.49

53.00

109.49

10.76

8.95

7.63

7.59

5.51

84.7

55.54

51.87

107.41

10.76

9.11

7.37

7.21

5.45

84.7

65.25

54.24

119.49

11.90

10.08

7.68

7.69

5.50

86.7

80.11

55.03

135.14

13.64

11.82

9.65

9.55

5.88

86.6

79.43

53.84

133.27

13.79

11.94

9.90

9.89

5.91

Fuel gallons consumed (thousands) . . . . . . .

343,709

302,781

255,008

200,498

171,931

Average economic fuel cost per gallon ($) .

1.79

1.48

1.82

2.99

3.21

(A) 
(B) 

See “Glossary of Airline Terms” elsewhere in this annual report for definitions of terms used in this table.
Reconciliation of CASM to Adjusted CASM:

2017

2016

2015

2014

2013

(in 
millions)

Per 
ASM

(in 
millions)

Per 
ASM

(in 
millions)

Per 
ASM

(in 
millions)

Per 
ASM

(in 
millions)

Per 
ASM

Year Ended December 31,

CASM (cents) ......................

7.63

7.37

7.68

9.65

9.90

Less:

Unrealized losses
(gains) related to fuel
derivative contracts ..... $
Loss on disposal of
assets ...........................
Special charges............

Out of period fuel
excise tax.....................
Supplemental rent
adjustment for
liabilities accrued in
prior years that are no
longer probable ...........

Adjusted CASM (cents)

—

4.2

12.6

—

0.01

0.04

—

(4.1)

(0.01)

7.59

— $

—

— $

(3.9)

(0.02) $

4.2

37.2

—

—

0.02

0.15

—

—

7.21

1.6

0.7

—

—

0.01

—

—

—

7.69

3.9

3.0

—

9.3

—

0.02

$

0.02

—

0.06

—

9.55

0.3

0.5

0.2

—

—

—

—

—

—

—

9.89

(C) 

Excludes aircraft fuel expense, loss on disposal of assets, special charges and supplemental rent adjustment for liabilities accrued in prior years that 
are no longer probable.

38

 
 
 
ITEM 7. 
OPERATIONS

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF 

You should read the following discussion of our financial condition and results of operations in conjunction with the financial 

statements and the notes thereto included elsewhere in this annual report. 

2017 Year in Review

The year 2017 marks our eleventh consecutive year of profitability. In 2017, we increased our capacity by 16.1%, as 
we grew our fleet of Airbus single-aisle aircraft from 95 to 112 aircraft, launched service to 36 new markets and added 2 new 
destinations: Hartford, Connecticut and Pittsburgh, Pennsylvania.

During 2017, we earned net income of $420.6 million ($6.06 per share, diluted), compared to net income of $264.9 
million ($3.76 per share, diluted) in 2016. The increase in earnings was a result of a 14.0% increase in our traffic and stable 
average yield, year over year, along with a $199.3 million tax benefit ($2.87 per diluted share) as a result of the enactment of 
the Tax Cuts and Jobs Act of 2017. This increase was partially offset by a 20.3% increase in operating expenses, as compared to 
the prior year.

For the year ended December 31, 2017, we achieved an operating profit margin of 14.7% on $2,647.7 million in 
operating revenues. Our traffic grew by 14.0% as we continued to address an underserved market with ultra-low fares. We 
maintained stable average yield, year over year, while we continued to experience competitive pressures throughout 2017. 
TRASM in 2017 was 8.95 cents, a decrease of 1.8% compared to the prior year period. Total revenue per passenger flight 
segment increased 1.9%, year over year, from $107.41 to $109.49 driven by a 2.2% increase in average non-ticket revenue per 
passenger flight segment and a 1.7% increase in average ticket revenue per passenger flight segment, as compared to the prior 
year. 

Our total non-ticket revenue increased by 14.3%, or $160.3 million, to $1,281.6 million in 2017. The increase in non-

ticket revenue was primarily attributable to higher bag, passenger usage fee and seat revenue, as compared to the prior year. 
Our unbundled model provides a more stable revenue stream as demonstrated during periods of lower passenger ticket yields.  

Our operating cost structure is a primary area of focus and is at the core of our ULCC business model. Our unit 

operating costs continue to be among the lowest of any airline in the United States. During 2017, our adjusted CASM ex-fuel 
increased slightly by 1.1% to 5.51 cents. The increase on a per-ASM basis was primarily due to increases in other operating and 
depreciation and amortization expense per ASM, partially offset by decreases in aircraft rent and salaries, wages and benefits 
expense per ASM. 

During 2017, we took delivery of 17 new aircraft financed under secured debt arrangements, 2 aircraft financed under 
operating leases, purchased 1 previously leased aircraft and returned 2 aircraft to its lessor. In addition, we took delivery of 2 
engines through cash purchases, 1 engine financed under an operating lease, and purchased 1 previously leased engine. As of 
December 31, 2017, our 112 Airbus A320-family aircraft fleet was comprised of 31 A319s, 51 A320ceos, 5 A320neos and 25 
A321ceos of which 46 aircraft are financed through secured debt, 58 are financed under operating leases and 8 are 
unencumbered. As of December 31, 2017, our aircraft orders consisted of 59 A320 family aircraft with Airbus scheduled for 
delivery from 2018 through 2021. 

Operating Revenues

Our operating revenues are comprised of passenger revenues and non-ticket revenues.

Passenger Revenues. Passenger revenues consist of the base fares that customers pay for air travel.

Non-ticket Revenues. Non-ticket revenues are generated from air travel-related charges for baggage, passenger usage fee 
(PUF) for bookings through certain of our distribution channels, advance seat selection, itinerary changes, hotel and rental car 
travel packages and loyalty programs such as our FREE SPIRIT affinity credit card program and $9 Fare Club. Non-ticket 
revenues also include revenues derived from the sale of advertising to third parties on our website and on board our aircraft. 

Substantially all of our revenues are denominated in U.S. dollars. Passenger revenues, as well as most non-ticket 
revenues, are recognized once the related flight departs. Accordingly, the value of tickets and portions of non-ticket revenues 
sold in advance of travel is included under our current liabilities as “air traffic liability,” or ATL, until the related air travel is 
provided. Some of our non-ticket revenues are recognized at the time the ancillary products are purchased or ancillary services 

39

are provided, such as revenues from our subscription-based $9 Fare Club, which we recognize on a straight-line basis over 12 
months. Revenue generated from the FREE SPIRIT credit card affinity program are recognized in accordance with the criteria 
as set forth in Accounting Standards Update ASU No. 2009-13. Please see “—Critical Accounting Policies and Estimates—
Frequent Flier Program.”

We recognize revenues net of certain taxes and airport passenger fees, which are collected by us on behalf of airports and 

governmental agencies and remitted to the applicable governmental entity or airport on a periodic basis. These taxes and fees 
include U.S. federal transportation taxes, federal security charges, airport passenger facility charges and foreign arrival and 
departure taxes. These items are collected from customers at the time they purchase their tickets, but are not included in our 
revenues. We record a liability upon collection from the customer and relieve the liability when payments are remitted to the 
applicable governmental agency or airport.

Operating Expenses

Our operating expenses consist of the following line items.

Aircraft Fuel. Aircraft fuel expense includes the cost of jet fuel, related federal taxes, fueling into-plane fees and 

transportation fees. It also includes realized and unrealized gains and losses arising from activity on our fuel derivatives, if any. 
Our fuel derivatives, if any, generally consist of United States Gulf Coast jet fuel swaps (jet fuel swaps) and United States Gulf 
Coast jet fuel options (jet fuel options).

Salaries, Wages and Benefits. Salaries, wages and benefits expense includes the salaries, hourly wages, bonuses and 
equity compensation paid to employees for their services, as well as the related expenses associated with employee benefit 
plans and employer payroll taxes. 

Aircraft Rent. Aircraft rent expense consists of all minimum lease payments under the terms of the Company's aircraft 
and spare engine lease agreements recognized on a straight-line basis. Aircraft rent expense also includes supplemental rent. 
Supplemental rent is made up of maintenance reserves paid to aircraft lessors in advance of the performance of major 
maintenance activities that are not probable of being reimbursed and probable and estimable return condition obligations. 
Aircraft rent expense is net of the amortization of gains and losses on sale leaseback transactions on our flight equipment. As of 
December 31, 2017, 58 of our 112 aircraft and 11 of our 15 spare engines are financed under operating leases. 

Landing Fees and Other Rents. Landing fees and other rents include both fixed and variable facilities expenses, such as 

the fees charged by airports for the use or lease of airport facilities, overfly fees paid to other countries and the monthly rent 
paid for our headquarters facility.

Depreciation and Amortization. Depreciation and amortization expense includes the depreciation of fixed assets we own 

and leasehold improvements. It also includes the amortization of heavy maintenance expenses we defer under the deferral 
method of accounting for heavy maintenance events and recognize into expense on a straight-line or usage basis until the  
earlier of the next estimated heavy maintenance event or the remaining lease term. 

Maintenance, Materials and Repairs. Maintenance, materials and repairs expense includes parts, materials, repairs and 
fees for repairs performed by third-party vendors directly required to maintain our fleet. It excludes direct labor cost related to 
our own mechanics, which is included under salaries, wages and benefits. It also excludes the amortization of heavy 
maintenance expenses, which we defer under the deferral method of accounting and amortize as a component of depreciation 
and amortization expense. 

Distribution. Distribution expense includes all of our direct costs, including the cost of web support, our third-party call 
center, travel agent commissions and related GDS fees and credit card transaction fees, associated with the sale of our tickets 
and other products and services. 

Special Charges. Special charges include lease termination charges and restructuring charges.

Loss on Disposal of Assets. Loss on disposal of assets includes the net losses on the disposal of our fixed assets.

Other Operating Expenses. Other operating expenses include airport operations expense and fees charged by third-party 
vendors for ground handling services and food and liquor supply service expenses, passenger re-accommodation expense, the 
cost of passenger liability and aircraft hull insurance, all other insurance policies except for employee related insurance, travel 
and training expenses for crews and ground personnel, professional fees, personal property taxes and all other administrative 
and operational overhead expenses. No individual item included in this category represented more than 5% of our total 
operating expenses. 

40

Other Expense (Income)

Interest Expense. Interest expense in 2017, 2016 and 2015 was primarily related to the financing of purchased aircraft. 

Capitalized Interest. Capitalized interest represents interest cost incurred during the acquisition period of an aircraft or 

the construction period of a long-term asset which theoretically could have been avoided had we not made PDPs for that 
aircraft or funded the construction of a long-term asset. The percent of interest expense capitalized is equal to the amount of 
interest which could have been avoided. As such, if the amount of PDPs on deposit and funds used in the construction of a 
long-term asset is less than the amount of related debt on which interest is incurred, then only a percent of total incurred interest 
expense qualifies for capitalization. These amounts are capitalized as part of the cost of the aircraft upon delivery or the long-
term asset upon placement in service. Capitalization of interest ceases when the asset is ready for service. Capitalized interest 
for 2017, 2016 and 2015 primarily related to the interest incurred on long-term debt.  

Interest Income. For 2017, interest income primarily represents interest income earned on cash, cash equivalents and 

short-term investments. For 2016 and 2015, interest income was primarily related to interest earned on cash, cash equivalents 
and on funds required to be held in escrow in accordance with the terms of our Series 2015-1 EETC. For a detailed discussion 
of the Series 2015-1 EETC, refer to “Notes to the Financial Statements—11. Debt and Other Obligations.” 

Other Expense. Other expense includes realized gains and losses related to foreign currency transactions. 

Income Taxes

We account for income taxes using the liability method. We record a valuation allowance to reduce the deferred tax assets 
reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will 
not be realized. Deferred taxes are recorded based on differences between the financial statement basis and tax basis of assets 
and liabilities and available tax loss and credit carryforwards. In assessing the realizability of the deferred tax assets, we 
consider whether it is more likely than not that some or all of the deferred tax assets will be realized. In evaluating the ability to 
utilize our deferred tax assets, we consider all available evidence, both positive and negative, in determining future taxable 
income on a jurisdiction by jurisdiction basis.

Trends and Uncertainties Affecting Our Business

We believe our operating and business performance is driven by various factors affecting airlines and their markets, 
trends affecting the broader travel industry and trends affecting the specific markets and customer base that we target. The 
following key factors may affect our future performance.

Competition. The airline industry is highly competitive. The principal competitive factors in the airline industry are fare 
pricing, total price, flight schedules, aircraft type, passenger amenities, number of routes served from a city, customer service, 
safety record, reputation, code-sharing relationships, frequent flier programs and redemption opportunities. Price competition 
occurs on a market-by-market basis through price discounts, changes in pricing structures, fare matching, target promotions and 
frequent flier initiatives. Airlines typically use discount fares and other promotions to stimulate traffic during normally slower 
travel periods to generate cash flow and to maximize unit revenue. The prevalence of discount fares can be particularly acute 
when a competitor has excess capacity that it is under financial pressure to sell. 

Beginning in 2015, and continuing into 2017, the airline industry saw greater and more persistent price discounting than 

in the preceding several years. In addition, significant airline capacity increases in certain major cities exerted strong downward 
price pressure in those markets. Finally, beginning in mid-2015 network carriers began matching low-cost carrier and ULCC 
pricing on portions of their marginal unsold capacity, particularly in their key hub markets. We expect the discounting trend to 
continue for the foreseeable future. 

Moreover, the network carriers have developed a fare-class pricing approach, in which a portion of available seats may be 

sold at or near ULCC prices, but without most product features available to their passengers paying at higher fare levels on the 
same flight. Broad fare discounting may have the effect of diluting the profitability of revenues of high-cost carriers but the 
fare-class approach may allow network carriers to continue offering a competitive price to ULCCs on some flights or routes, 
while maintaining higher pricing to their traditional constituencies of business and more affluent travelers. Refer to “Risk 
Factors—Risks Related to Our Industry—We operate in an extremely competitive industry."

41

Seasonality and Volatility. Our results of operations for any interim period are not necessarily indicative of those for the 

entire year because the air transportation business is subject to significant seasonal fluctuations. We generally expect demand to 
be greater in the second and third quarters compared to the rest of the year. The air transportation business is also volatile and 
highly affected by economic cycles and trends. Consumer confidence and discretionary spending, fear of terrorism or war, 
weakening economic conditions, fare initiatives, fluctuations in fuel prices, labor actions, changes in governmental regulations 
on taxes and fees, weather and other factors have resulted in significant fluctuations in revenues and results of operations in the 
past. We believe demand for business travel historically has been more sensitive to economic pressures than demand for low-
price travel. Finally, a significant portion of our operations are concentrated in markets such as South Florida, the Caribbean, 
Latin America and the Northeast and northern Midwest regions of the United States, which are particularly vulnerable to 
weather, airport traffic constraints and other delays. 

Aircraft Fuel. Fuel costs represents one of our largest operating expenses, as it does for most airlines. Fuel costs have 
been subject to wide price fluctuations in recent years. Fuel availability and pricing are also subject to refining capacity, periods 
of market surplus and shortage and demand for heating oil, gasoline and other petroleum products, as well as meteorological, 
economic and political factors and events occurring throughout the world, which we can neither control nor accurately predict. 
We source a significant portion of our fuel from refining resources located in the southeast United States, particularly facilities 
adjacent to the Gulf of Mexico. Gulf Coast fuel is subject to volatility and supply disruptions, particularly in hurricane season 
when refinery shutdowns have occurred, or when the threat of weather-related disruptions has caused Gulf Coast fuel prices to 
spike above other regional sources. Our fuel derivatives, if any, generally consist of United States Gulf Coast jet fuel swaps (jet 
fuel swaps) and United States Gulf Coast jet fuel options (jet fuel options). Both jet fuel swaps and jet fuel options can be used 
at times to protect the refining price risk between the price of crude oil and the price of refined jet fuel, and to manage the risk 
of increasing fuel prices. Our fuel hedging practices are dependent upon many factors, including our assessment of market 
conditions for fuel, our access to the capital necessary to support margin requirements, the pricing of hedges and other 
derivative products in the market, our overall appetite for risk and applicable regulatory policies. As of December 31, 2017, we 
had no outstanding jet fuel derivatives. As of December 31, 2017, we purchased all of our aircraft fuel under a single fuel 
service contract. The cost and future availability of jet fuel cannot be predicted with any degree of certainty.

Labor. The airline industry is heavily unionized. The wages, benefits and work rules of unionized airline industry 
employees are determined by collective bargaining agreements, or CBAs. Relations between air carriers and labor unions in the 
United States are governed by the RLA. Under the RLA, CBAs generally contain “amendable dates” rather than expiration 
dates, and the RLA requires that a carrier maintain the existing terms and conditions of employment following the amendable 
date through a multi-stage and usually lengthy series of bargaining processes overseen by the NMB. This process continues 
until either the parties have reached agreement on a new CBA, or the parties have been released to “self-help” by the NMB. In 
most circumstances, the RLA prohibits strikes; however, after release by the NMB, carriers and unions are free to engage in 
self-help measures such as strikes and lockouts.

We have four union-represented employee groups comprising approximately 75% of our employees at December 31, 
2017. Our pilots are represented by the Air Line Pilots Association, International, or ALPA, our flight attendants are represented 
by the Association of Flight Attendants, or AFA-CWA, our dispatchers are represented by the Transport Workers Union of 
America, or TWU, and our ramp service agents are represented by the International Association of Machinists and Aerospace 
Workers, or IAMAW. Conflicts between airlines and their unions can lead to work slowdowns or stoppages.

In June 2010, we experienced a five-day strike by our pilots, which caused us to shut down our flight operations. The 

strike ended as a result of our reaching a tentative agreement under a Return to Work Agreement and a full flight schedule was 
resumed on June 18, 2010. On August 1, 2010, we entered into a five-year collective bargaining agreement with our pilots. In 
August 2015, our collective bargaining agreement with its pilots, represented by ALPA, became amendable. In June 2016, 
ALPA requested the services of the National Mediation Board (NMB) to facilitate negotiations for an amended agreement and 
we joined ALPA in the request. During 2017, we experienced operational disruption from pilot-related work action which 
adversely impacted our results. We obtained a temporary restraining order to enjoin further illegal labor action. In January 
2018, under the guidance of the NMB assigned mediators, the parties reached a tentative amendable agreement that is subject 
to ratification by the pilot group. The ratification vote will take place throughout February 2018. The current tentative 
agreement is for a five-year contract which includes a one-time $75 million ratification incentive and other negotiated 
contractual provisions. We can provide no assurance that the tentative agreement will be approved. Under the RLA, the parties' 
current agreement remains in effect until an amended agreement is ratified. 

In March 2016, with the help of the NMB, we reached a tentative agreement for a five-year contract with our flight 
attendants. The tentative agreement was subject to ratification by the flight attendant membership. In May 2016, we were 
notified that the flight attendants voted to approve the new five-year contract. 

42

In August 2013, we entered into a five-year agreement with our dispatchers. In December 2017, the Professional Airline 

Flight Control Association (“PAFCA”) filed an application with the NMB seeking to represent our dispatchers, who are 
currently represented by the TWU. In January 2018, the NMB determined that a representation election would be held. The 
voting period for the representation election will close on February 20, 2018.  

In July 2014, certain ramp service agents directly employed by us voted to be represented by the IAMAW. In May 2015, 

we entered into a five-year interim collective bargaining agreement with the IAMAW, covering material economic terms. In 
June 2016, with the help of the IAMAW, we reached an agreement on the remaining terms of the collective bargaining 
agreement, which is amendable in June 2020. We believe the five-year term of our CBAs is valuable in providing stability to 
our labor costs and provide us with competitive labor costs compared to other U.S.-based low-cost carriers. If we are unable to 
reach agreement with any of our unionized work groups in current or future negotiations regarding the terms of their CBAs, we 
may be subject to work interruptions or stoppages, such as the strike by our pilots in June 2010. A strike or other significant 
labor dispute with our unionized employees is likely to adversely affect our ability to conduct business. Any agreement we do 
reach could increase our labor and related expenses.

In 2010, the Patient Protection and Affordable Care Act was passed into law. Under the current administration, this law 

may be repealed in its entirety or certain aspects may be changed or replaced. If the law is repealed or modified or if new 
legislation is passed, such action could potentially increase our operating costs, with healthcare costs increasing at a higher rate 
than our employee headcount. 

Maintenance Expense. Maintenance expense grew through 2017, 2016 and 2015 mainly as a result of a growing fleet and  

the gradual increase of required maintenance for the older aircraft in our fleet. As the fleet ages, we expect that maintenance 
costs will increase in absolute terms. The amount of total maintenance costs and related amortization of heavy maintenance 
(included in depreciation and amortization expense) is subject to many variables such as future utilization rates, average stage 
length, the interval between heavy maintenance events, the size and makeup of the fleet in future periods and the level of 
unscheduled maintenance events and their actual costs. Accordingly, we cannot reliably quantify future maintenance expenses 
for any significant period of time. However, we believe, based on our scheduled maintenance events, maintenance expense and 
maintenance-related amortization expense in 2018 will be approximately $203 million. In addition, we expect to capitalize 
$211 million of costs for heavy maintenance during 2018. 

As a result of a majority of our fleet being acquired over a relatively short period of time, heavy maintenance 

scheduled on certain aircraft will overlap, meaning we will incur our most expensive scheduled maintenance obligations on 
certain aircraft at roughly the same time. These more significant maintenance activities will result in out-of-service periods 
during which our aircraft will be dedicated to maintenance activities and unavailable to fly revenue service. When accounting 
for maintenance expense under the deferral method, heavy maintenance is amortized over the shorter of either the remaining 
lease term or the next estimated heavy maintenance event. As a result, deferred maintenance events occurring closer to the end 
of the lease term will generally have shorter amortization periods than those occurring earlier in the lease term. This will create 
higher depreciation and amortization expense specific to any aircraft related to heavy maintenance during the final years of the 
lease as compared to earlier periods. Please see “— Critical Accounting Policies and Estimates-Aircraft Maintenance, 
Materials, Repair Costs and Related Heavy Maintenance Amortization.”

Maintenance Reserve Obligations. The terms of some of our aircraft lease agreements require us to post deposits for 

future maintenance, also known as maintenance reserves, to the lessor in advance of and as collateral for the performance of 
major maintenance events, resulting in our recording significant prepaid deposits on our balance sheet. As a result, the cash 
costs of scheduled major maintenance events are paid in advance of the recognition of the maintenance event in our results of 
operations. Please see “—Critical Accounting Policies and Estimates—Aircraft Maintenance, Materials, Repair Costs and 
Related Heavy Maintenance Amortization” and “—Maintenance Reserves.”

Critical Accounting Policies and Estimates

The following discussion and analysis of our financial condition and results of operations is based on our financial 
statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The 
preparation of these financial statements requires us to make estimates and judgments that affect the reported amount of assets 
and liabilities, revenues and expenses and related disclosure of contingent assets and liabilities at the date of our financial 
statements. For a detailed discussion of our significant accounting policies, refer to “Notes to Financial Statements—1. 
Summary of Significant Accounting Policies.” 

Critical accounting policies are defined as those policies that reflect significant judgments or estimates about matters both 

inherently uncertain and material to our financial condition or results of operations.

43

 
Revenue Recognition. Revenues from tickets sold are initially deferred as ATL. Passenger revenues are recognized when 

transportation is provided.  An unused non-refundable ticket expires at the date of scheduled travel and is recognized as 
revenue for the expired ticket value at the date of scheduled travel.

Our most significant non-ticket revenues include revenues generated from air travel-related services paid for baggage, 

passenger usage fees, advance seat selection, itinerary changes, and loyalty programs. The majority of our non-ticket revenues 
are recognized once the related flight departs. Some of our non-ticket revenues, such as those related to itinerary changes, are 
recognized at the time products are purchased or services are provided. These revenues also include commissions from the 
sales of hotel rooms, trip insurance and rental cars recognized at the time the service is rendered. Non-ticket revenues also 
include revenues from our subscription-based $9 Fare Club, recognized on a straight-line basis over 12 months. 

Customers may elect to change their itinerary prior to the date of departure. A service charge is assessed and recognized 

on the date the change is initiated and is deducted from the face value of the original purchase price of the ticket, and the 
original ticket becomes invalid. The amount remaining after deducting the service charge is called a credit shell which 
generally expires 60 days from the date the credit shell is created and can be used towards the purchase of a new ticket and our 
other service offerings. The amount of credits expected to expire unused is recognized as revenue upon issuance of the credit 
and is estimated based on historical experience. Estimating the amount of credits that will go unused involves some level of 
subjectivity and judgment.

Frequent Flier Program. We accrue for mileage credits earned through travel, including mileage credits for members 

with an insufficient number of mileage credits to earn an award, under our FREE SPIRIT program based on the estimated 
incremental cost of providing free travel for credits that are expected to be redeemed. Incremental costs include fuel, insurance, 
security, ticketing and facility charges reduced by an estimate of amounts required to be paid by the passenger when redeeming 
the award.

Under our affinity card program, funds received for the marketing of a co-branded Spirit credit card and delivery of 

award miles are accounted for as a multiple-deliverable arrangement. At the inception of the arrangement, we evaluated all 
deliverables in the arrangement to determine whether they represent separate units of accounting. We determined the 
arrangement had three separate units of accounting: (i) travel miles to be awarded, (ii) licensing of brand and access to member 
lists and (iii) advertising and marketing efforts. We established the estimated selling price for all deliverables that qualified for 
separation, as arrangement consideration should be allocated based on relative selling price. The manner in which the selling 
price was established was based on the applicable hierarchy of evidence. Total arrangement consideration was then allocated to 
each deliverable on the basis of the deliverable's relative selling price. In considering the hierarchy of evidence, we first 
determined whether vendor-specific objective evidence of selling price or third-party evidence of selling price existed. We 
determined that neither vendor-specific objective evidence of selling price nor third-party evidence existed due to the 
uniqueness of our program. As such, we developed our best estimate of the selling price for all deliverables. For the selling 
price of travel, we considered a number of entity-specific factors, including the number of miles needed to redeem an award, 
average fare of comparable segments, breakage, restrictions, fees to redeem miles and other charges. For licensing of brand and 
access to member lists, we considered both market-specific factors and entity-specific factors, including general profit margins 
realized in the marketplace/industry, brand power, market royalty rates and size of customer base. For the advertising and 
marketing element, we considered market-specific factors and entity-specific factors, including our internal costs (and 
fluctuations of costs) of providing services, volume of marketing efforts and overall advertising plan. Consideration allocated 
based on the relative selling price to both brand licensing and advertising elements is recognized as revenue when earned and 
recorded in non-ticket revenue. Consideration allocated to award miles is deferred and recognized ratably as passenger revenue 
over the estimated period the transportation is expected to be provided which is currently estimated at 17 months. For 
additional information, refer to “Notes to Financial Statements—1. Summary of Significant Accounting Policies—Frequent 
Flier Program”. 

Accounting for property and equipment. Property and equipment is stated at cost, less accumulated depreciation and 
amortization. Depreciation of operating property and equipment is computed using the straight-line method applied to each unit 
of property. Property under capital leases and related obligations are initially recorded at an amount equal to the present value 
of future minimum lease payments computed using our incremental borrowing rate or, when known, the interest rate implicit in 
the lease. Amortization of property under capital leases is on a straight-line basis over the lease term and is included in 
depreciation and amortization expense. In accounting for property and equipment, we must make estimates about the expected 
useful lives of the assets, the expected residual values of the assets, and the potential for impairment based on the fair value of 
the assets and their future expected cash flows.

The depreciable lives used for the principal depreciable asset classifications are:

44

Estimated Useful Life

Aircraft, engines and flight simulators . . . . . . . . . . . . . . . . . . . . 25 years
Spare rotables and flight assemblies . . . . . . . . . . . . . . . . . . . . . . 7 to 15 years
Other equipment and vehicles . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 7 years
Internal use software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 to 10 years
Capital leases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lease term
Leasehold improvements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lesser of lease term or estimated useful life of the

improvement

Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lesser of lease term or 30 years

As of December 31, 2017, we had 54 aircraft, 4 spare engines and 1 flight simulator capitalized within flight equipment 
with depreciable lives of 25 years. As of December 31, 2017, we had 58 aircraft financed through operating leases with lease 
terms of 8 to 18 years and 11 spare engines financed through operating leases with lease terms of 2 to 13 years. Residual values 
for new aircraft, new engines, major spare rotable parts, avionics and assemblies are generally estimated to be 10%. 

We record impairment charges on long-lived assets used in operations when events and circumstances indicate the assets 

may be impaired, the undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of 
those assets, and the net book value of the assets exceeds their estimated fair value. In making these determinations, we use 
certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and (ii) estimated, undiscounted future 
cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, length 
of service the asset will be used in our operations, and estimated salvage values.

Aircraft Maintenance, Materials, Repair Costs and Related Heavy Maintenance Amortization. We account for heavy 
maintenance under the deferral method. Under the deferral method the cost of heavy maintenance is capitalized and amortized 
as a component of depreciation and amortization expense over the earlier of the next estimated heavy maintenance event or the 
remaining lease term or useful life of the aircraft. Management expects that heavy maintenance events occurring closer to the 
end of the lease term will be amortized over the remaining lease term rather than over the next estimated heavy maintenance 
event. Amortization of engine and aircraft overhaul costs was $53.9 million, $43.8 million and $43.1 million for the years 
ended December 31, 2017, 2016 and 2015, respectively. If heavy maintenance costs were amortized within maintenance, 
material and repairs expense in the statement of operations, our maintenance, material and repairs expense would have been 
$164.3 million, $142.4 million and $123.6 million for the years ended December 31, 2017, 2016 and 2015, respectively. During 
the years ended December 31, 2017, 2016 and 2015, we capitalized $78.2 million, $35.4 million and $9.1 million of costs for 
heavy maintenance, respectively. The timing of the next heavy maintenance event is estimated based on assumptions including 
estimated usage, FAA-mandated maintenance intervals, current condition of the related component, the age of the related 
component and average removal times as suggested by the manufacturer. These assumptions may change based on changes in 
our utilization of our aircraft, changes in government regulations and suggested manufacturer maintenance intervals. In 
addition, these assumptions can be affected by unplanned incidents that could damage an airframe, engine or major component 
to a level that would require a heavy maintenance event prior to a scheduled maintenance event. To the extent the estimated 
timing of the next maintenance event is extended or shortened, the related amortization period would be lengthened or 
shortened, resulting in higher amortization expense over a shorter period or lower amortization expense over a longer period, 
respectively. Heavy maintenance events include 6-year and 12-year airframe checks, engine overhauls, LLP replacement and 
overhauls to major components. Certain maintenance functions are outsourced under contracts that require payment based on a 
performance measure such as flight hours. Costs incurred for maintenance and repair under flight hour maintenance contracts, 
where labor and materials price risks have been transferred to the service provider, are accrued based on contractual payment 
terms. Routine cost for maintaining the airframes and engines and line maintenance are charged to maintenance, materials and 
repairs expense as performed.

Maintenance Reserves. Some of our aircraft and engine master lease agreements provide that we pay maintenance 
reserves to aircraft lessors to be held as collateral in advance of our performance of major maintenance activities. These lease 
agreements generally provide that maintenance reserves are reimbursable to us upon completion of the maintenance event. A 
majority of these maintenance reserve payments are calculated based on a utilization measure, such as flight hours or cycles, 
and are used solely to collateralize the lessor for maintenance time run off the aircraft until the completion of the maintenance 
of the aircraft. 

Maintenance reserve payments are reflected as aircraft maintenance deposits in the accompanying balance sheets. We 
make certain assumptions to determine the recoverability of maintenance deposits. These assumptions are based on various 
factors such as the estimated time between the maintenance events, the cost of future maintenance events and the utilization of 

45

 
the aircraft is estimated before it is returned to the lessor. When it is not probable we will recover amounts currently on deposit 
with a lessor, such amounts are expensed as supplemental rent. 

Supplemental rent is made up of maintenance reserves paid to aircraft lessors that are not probable of being reimbursed 

and probable and estimable return condition obligations. We expensed $8.4 million, $9.0 million and $7.7 million of 
supplemental rent recorded within aircraft rent during 2017, 2016 and 2015, respectively. These amounts include $0.4 million, 
$2.2 million and $2.3 million of paid maintenance reserves expensed as supplemental rent during 2017, 2016 and 2015, 
respectively. As of December 31, 2017 and 2016, we had aircraft maintenance deposits of $326.2 million and $286.4 million, 
respectively, on our balance sheets. 

Leased Aircraft Return Costs. Our aircraft lease agreements often contain provisions that require us to return aircraft 
airframes and engines to the lessor in a certain condition or pay an amount to the lessor based on the airframe and engine's 
actual return condition. Lease return costs include all costs that would be incurred at the return of the aircraft, including costs 
incurred to repair the airframe and engines to the required condition as stipulated by the lease. Lease return costs could include, 
but are not limited to redelivery cost, redelivery crew cost, fuel, final inspections, reconfiguration of the cabin, repairs to the 
airframe, painting, overhaul of engines, replacement of components and checks. Lease return costs are recognized beginning 
when it is probable that such costs will be incurred and they can be estimated. Incurrence of lease return costs becomes 
probable and the amount of those costs can typically be estimated near the end of the lease term. When determining probability 
and estimated cost, there are various factors which need to be considered such as current condition of the aircraft, the age of the 
aircraft at lease expiration, number of hours run on the engines, number of cycles run on the airframe, projected number of 
hours run on the engine at the time of return, number of projected cycles run on the airframe at the time of return, the extent of 
repairs needed if any at return, return locations, current configuration of the aircraft, current paint of the aircraft, estimated 
escalation of cost of repairs and materials at the time of return, current flight hour agreement rates and future flight hour 
agreement rates. In addition, typically near the lease return date, the lessors may allow reserves to be applied as return 
condition consideration or pass on certain return provisions if they do not align with their current plans to remarket the aircraft. 
When costs become both probable and estimable, they are accrued on a straight-line basis as contingent rent, a component of 
supplemental rent, through the remaining lease term. Management expects return costs to be estimable near the end of the lease 
term, as such, contingent rent for related aircraft will be higher near the end of the lease term. 

Results of Operations

In 2017, we generated operating revenues of $2,647.7 million and operating income of $388.8 million resulting in a 
14.7% operating margin and net earnings of $420.6 million. In 2016, we generated operating revenues of $2,322.0 million and 
operating income of $443.7 million resulting in a 19.1% operating margin and net earnings of $264.9 million. Operating 
revenues increased, year over year, mainly as a result of a 14.0% increase in traffic. Increased operations resulted in higher 
operating expenses across the board with the exception of special charges expense. Aircraft fuel expense alone increased by 
37.5%, year over year, due to an increase in both fuel price per gallon and gallons consumed.

As of December 31, 2017, our cash and cash equivalents was $800.8 million, an increase of $99.9 million compared to 
the prior year. Cash and cash equivalents is driven by cash from our operating and financing activities offset by cash used to 
fund PDPs and capital expenditures. In addition to cash and cash equivalents, as of December 31, 2017, we had $100.9 million 
in short-term investment securities.

Operating Revenues

Year Ended 
2017

% change 2017 
versus 2016

Year Ended 
2016

% change 2016 
versus 2015

Year Ended 
2015

Passenger (thousands). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $

1,366,034

Non-ticket (thousands) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1,281,632

Total operating revenue (thousands) . . . . . . . . . . . . . . . . . . . $

2,647,666

Total operating revenue per ASM (TRASM) (cents) . . . . . .

Average ticket revenue per passenger flight segment. . . . . . $

Average non-ticket revenue per passenger flight segment . .

8.95

56.49

53.00

Total revenue per passenger flight segment . . . . . . . . . . . . . $

109.49

13.8%

14.3%

14.0%

(1.8)%

1.7%

2.2%

1.9%

$

$

$

$

1,200,621

1,121,335

2,321,956

9.11

55.54

51.87

107.41

2.7%

15.3%

8.4%

(9.6)%

(14.9)%

(4.4)%

(10.1)%

$

$

$

$

1,169,338

972,125

2,141,463

10.08

65.25

54.24

119.49

2017 compared to 2016

46

Operating revenues increased by $325.7 million, or 14.0%, to $2,647.7 million in 2017 compared to 2016, primarily due 

to an increase in traffic of 14.0%, and a stable average yield of 10.76 cents, year over year.

TRASM for 2017 was 8.95 cents, a decrease of 1.8% compared to 2016, as a result of a 1.6 point decrease in load factor 

and stable operating yields, year over year. Total revenue per passenger flight segment increased 1.9% from $107.41 in 2016 to 
$109.49 in 2017. The year-over-year increase in total revenue per passenger flight segment was driven by a 2.2% increase in 
average non-ticket revenue per passenger flight segment and a 1.7% increase in average ticket revenue per passenger flight 
segment, as compared to the prior year. The increase in non-ticket revenue per passenger flight segment was primarily 
attributable to higher bag, passenger usage fee and seat revenue per passenger flight segment, as compared to the prior year.

2016 compared to 2015

Operating revenues increased by $180.5 million, or 8.4%, to $2,322.0 million in 2016 compared to 2015, primarily due to 

an increase in traffic of 19.9%, partially offset by a decrease in average yield of 9.6% to 10.76 cents. The decrease in average 
yield resulted from competitive pressures from major U.S. carriers aggressively discounting fare prices.

TRASM for 2016 was 9.11 cents, a decrease of 9.6% compared to 2015, as a result of lower operating yields on stable 

load factors. Total revenue per passenger flight segment decreased 10.1% from $119.49 in 2015 to $107.41 in 2016. The year-
over-year decrease in total revenue per passenger flight segment was driven by a decrease of 14.9% in ticket revenue per 
passenger flight segment, resulting from competitive pressures noted during the period.

During 2016, our average non-ticket revenue per passenger flight segment declined to a lesser extent, by 4.4%, or $2.37, 
to $51.87, mostly resulting from the competitive pressures noted above. Our unbundled model provides a more stable revenue 
stream as demonstrated during periods of lower passenger ticket yields. The decrease in non-ticket revenue per passenger flight 
segment was primarily attributable to lower bag and change fee revenue per flight segment. 

Operating Expenses

Since adopting our ULCC model, we have continuously sought to reduce our unit operating costs and have created one of 

the industry's lowest cost structures in the United States. The table below presents our unit operating costs (CASM) and year-
over-year changes. 

Year 
Ended 
2017

CASM

Change 2017 versus
2016

Per-ASM
Change

Percent
change

Year 
Ended 
2016

CASM

Change 2016 versus
2015

Per-ASM
Change

Percent
change

Year 
Ended 
2015

CASM

Operating expenses:

Aircraft fuel (1) . . . . . . . . . . . . . . .

2.08¢

Salaries, wages and benefits. . . . . .

Aircraft rent . . . . . . . . . . . . . . . . . .

Landing fees and other rentals . . . .

Depreciation and amortization . . . .

Maintenance, materials and repairs

Distribution. . . . . . . . . . . . . . . . . . .

Special charges . . . . . . . . . . . . . . . .

Loss on disposal of assets. . . . . . . .

Other operating expenses . . . . . . . .

Total operating expense. . . . . . . . . . . . . .

CASM . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjusted CASM (2). . . . . . . . . . . . . . . . .

Adjusted CASM ex fuel (3). . . . . . . . . . .

1.78

0.70

0.61

0.47

0.37

0.38

0.04

0.01

1.18

7.63

7.59

5.51

0.32¢

(0.07)

(0.09)

0.02

0.07

(0.02)

—

(0.11)

(0.01)

0.13

0.26

0.38

0.06

18.2%

(3.8)

(11.4)

3.4

17.5

(5.1)

—

NM

NM

12.4

3.5

5.3

1.1

1.76¢

(0.41)¢

(18.9)%

2.17¢

1.85

0.79

0.59

0.40

0.39

0.38

0.15

0.02

1.05

7.37

7.21

5.45

0.07

(0.21)

(0.03)

0.05

0.01

(0.03)

0.15

0.01

0.07

(0.31)

(0.48)

(0.05)

3.9

(21.0)

(4.8)

14.3

2.6

(7.3)

NM

NM

7.1

(4.0)

(6.2)

(0.9)

1.78

1.00

0.62

0.35

0.38

0.41

—

0.01

0.98

7.68

7.69

5.50

(1) 

Aircraft fuel expense is the sum of (i) “into-plane fuel cost,” which includes the cost of jet fuel and certain other charges such as fuel taxes and oil, 
(ii) realized gains and losses related to fuel derivative contracts, if any, and (iii) unrealized gains and losses related to fuel derivative contracts, if 
any. The following table summarizes the components of aircraft fuel expense for the periods presented:

47

 
 
Year Ended December 31,

2017

2016

2015

(in thousands)

Into-plane fuel cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $

615,581

$

447,553

$

454,747

Realized losses (gains) related to fuel derivative contracts, net . . . . . . . . . . . . . . . . . . . .

Unrealized losses (gains) related to fuel derivative contracts, net. . . . . . . . . . . . . . . . . . .

—

—

—

—

10,580

(3,880)

Aircraft fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $

615,581

$

447,553

$

461,447

(2) 

Reconciliation of CASM to Adjusted CASM: 

Year Ended December 31,

2017

2016

2015

(in 
millions)

Per ASM

7.63

(in 
millions)

(in 
millions)

Per ASM

7.37

Per ASM

7.68

CASM (cents).............................................................

Less:

Unrealized losses (gains) related to fuel
derivative contracts............................................ $
Loss on disposal of assets..................................

Special charges ..................................................

Supplemental rent adjustment for liabilities
accrued in prior years that are no longer
probable .............................................................

—

4.2

12.6

(4.1)

Adjusted CASM (cents) .............................................

— $

0.01

0.04

(0.01)

7.59

—

4.2

37.2

—

— $

(3.9)

(0.02)

0.02

0.15

—

7.21

1.6

0.7

—

0.01

—

—

7.69

(3) 

Excludes aircraft fuel expense, loss on disposal of assets, special charges and supplemental rent adjustment for liabilities accrued in prior years that 
are no longer probable.

2017 compared to 2016

Operating expenses increased by $380.6 million, or 20.3%, in 2017 primarily due to an increase in operations as reflected 

by a 16.1% growth in capacity and a 14.0% increase in traffic. Operating expenses also increased as a result of an increase in 
aircraft fuel expense year over year. 

Our adjusted CASM ex fuel for 2017 increased by 1.1% as compared to 2016. The increase on a per-ASM basis was 

primarily a result of increases in other operating and depreciation and amortization expense per ASM, partially offset by 
decreases in aircraft rent and salaries, wages and benefits expense per ASM.

Aircraft fuel expenses includes both into-plane expense (as defined below) and realized and unrealized net gains or losses 

from fuel derivatives, if any. Into-plane fuel expense is defined as the price that we generally pay at the airport, or the “into-
plane” price, including taxes and fees. Into-plane fuel prices are affected by the global oil market, refining costs, transportation 
taxes and fees, which can vary by region in the United States and other countries where we operate. Into-plane fuel expense 
approximates cash paid to the supplier and does not reflect the effect of any fuel derivatives. We had no activity related to fuel 
derivative instruments during 2017 and 2016. Management chose not to elect hedge accounting on any fuel derivative 
instruments entered into during 2015 and, as a result, changes in the fair value of these fuel derivative contracts are recorded 
within the period as a component of aircraft fuel expense. 

Aircraft fuel expense increased by 37.5% from $447.6 million in 2016 to $615.6 million in 2017. The increase was due to 

a 20.9% increase in fuel price per gallon and a 13.5% increase in fuel gallons consumed.

48

 
The elements of the changes in aircraft fuel expense are illustrated in the following table:

Fuel gallons consumed

Into-plane fuel cost per gallon

Into-plane fuel expense

Realized losses (gains) related to fuel derivative contracts, net

Unrealized losses (gains) related to fuel derivative contracts, net
Aircraft fuel expense (per statement of operations)

Twelve Months Ended
December 31,

2017

2016

(in thousands, except per
gallon amounts)

Percent
Change

343,709

302,781

$

1.79

$

1.48

$ 615,581

$ 447,553

—

—

—
$ 615,581

—
$ 447,553

13.5 %

20.9 %

37.5 %

NM

NM
37.5%

Gulf Coast Jet indexed fuel is the basis for a substantial majority of our fuel consumption and is impacted by both the 
price of crude oil as well as increases or decreases in refining margins associated with the conversion of crude oil to jet fuel. 
The into-plane fuel cost per gallon increase of 20.9% was primarily a result of an increase in jet fuel prices.

During the twelve months ended December 31, 2017 and 2016, we had no activity related to fuel derivatives and thus had 

no realized or unrealized gains or losses related to fuel derivatives. 

We track economic fuel expense, which we believe is the best measure of the effect fuel prices are currently having on 

our business, because it most closely approximates the net cash outflow associated with purchasing fuel used for our operations 
during the period. We define economic fuel expense as into-plane fuel expense and realized gains or losses on derivative 
contracts. The key difference between aircraft fuel expense, as recorded in our statement of operations, and economic fuel 
expense is unrealized mark-to-market changes in the value of aircraft fuel derivatives outstanding. Many industry analysts 
evaluate airline results using economic fuel expense and it is used in our internal management reporting. 

The elements of the changes in economic fuel expense are illustrated in the following table: 

Into-plane fuel expense

Realized (gains) and losses related to fuel derivative contracts, net
Economic fuel expense

Fuel gallons consumed
Economic fuel cost per gallon

Twelve Months Ended
December 31,

2017

2016

(in thousands, except per
gallon amounts)

Percent
Change

$ 615,581

$ 447,553

—
$ 615,581

—
$ 447,553

343,709
1.79

302,781
1.48

$

$

37.5 %

NM
37.5%

13.5 %
20.9%

 Fuel gallons consumed increased 13.5% as a result of increased operations, as evidenced by a 12.5% increase in block 

hours.  

Labor costs in 2017 increased by $55.5 million, or 11.7%, compared to 2016, due mainly to a 19.7% increase in our pilot 

and flight attendant workforce resulting from an increase to our aircraft fleet of 17 new aircraft deliveries in 2017, partially 
offset by a decrease in incentive compensation expense year over year. On a per-ASM basis, labor costs decreased primarily 
due to lower incentive compensation expense, year over year, resulting from lower metric performance and the ratification 
incentive related to the flight attendant contract for which an incentive of $8.4 million was recorded during the first quarter of 
2016. 

During 2017, aircraft rent increased $4.2 million, or 2.1%, compared to 2016. On a dollar basis, aircraft rent remained 

relatively stable as the number of leased aircraft and spare engines remained relatively stable, year over year. As of December 
31, 2017, we had 58 aircraft and 11 spare engines financed under operating leases. As of December 31, 2016, we had 59 aircraft 
and 11 spare engines financed under operating leases. On a per-ASM basis, aircraft rent expense decreased due to a change in 

49

 
 
 
 
the composition of our aircraft fleet between leased aircraft (for which rent expense is recorded under aircraft rent) and 
purchased aircraft (for which depreciation expense is recorded under depreciation and amortization). Since the prior year 
period, we have taken delivery of 17 purchased aircraft, which increased capacity but had no effect on aircraft rent expense, as 
these assets were purchased and are being depreciated over their useful life. Had the respective aircraft been leased, the change 
in rent expense, on both a dollar and per-ASM basis, would have been greater than the increase currently experienced in 
depreciation and amortization as a result of these purchases. 

Landing fees and other rents for 2017 increased by $29.0 million, or 19.1%, compared to 2016 primarily due to a 10.7% 
increase in departures. In addition, on both a dollar and per-ASM basis, landing fees and other rents increased due to increased 
volume at higher cost airports, year over year, as well as an increase in facility rent resulting from the addition of new stations 
and rate increases at some of our existing stations. 

Depreciation and amortization increased by $39.0 million, or 38.6%, compared to the prior year period. The increase on 

both a dollar and per-ASM basis was primarily due to increased depreciation expense resulting from the purchase of 17 new 
aircraft and the purchase of 1 previously leased aircraft during 2017.  

Maintenance, materials and repairs expense increased by $11.9 million, or 12.0%, in 2017, as compared to 2016 . The 

increase in maintenance costs on a dollar basis was due to routine and ongoing maintenance on a growing fleet. On a per unit-
basis, maintenance costs decreased as the timing and mix of maintenance events resulted in fewer maintenance events, offset by 
higher cost events in 2017, as compared to 2016. We expect maintenance expense, on a dollar basis, to increase as our fleet 
continues to grow and age, resulting in the need for additional and more frequent repairs over time. 

Distribution expense increased by $17.0 million, or 17.6%, in 2017, compared to 2016. The increase on a dollar basis was 

primarily due to increased sales volume. On a per-ASM basis, distribution costs remained stable as compared to the prior year 
period. We had a decrease in sales volume transacted through third-party travel agents offset by an increase in sales volume 
transacted through our website and call center, as compared to the prior year period. 

The following table shows our distribution channel usage:

Website

Third-party travel agents

Call center

Twelve Months
Ended December 31,

2017

2016

Change

66.2% 63.6%

28.4

5.4

31.7

4.7

2.6
(3.3)
0.7

Special charges for the year ended 2017 consisted primarily of $12.6 million in lease termination charges recognized in 

connection with the purchase of one aircraft and one engine previously financed under operating lease agreements. The amount 
recorded as lease termination charges represents the excess of the purchase price paid over the appraised fair value of the 
aircraft and engine, less previously expensed supplemental rent and other non-cash items. For further discussion on these 
purchases, refer to "Notes to Financial Statements—3. Special Charges." 

Other operating expenses in 2017 increased by $80.6 million, or 30.2%, compared to 2016 primarily due to an increase in 

overall operations and higher passenger re-accommodation expense year over year. As compared to the prior year period, we 
increased departures by 10.7% and had 11.9% more passenger flight segments, which drove increases in variable operating 
expenses. Other operating expense per ASM increased primarily due to higher passenger re-accommodation expense, as 
compared to the prior year period.

2016 compared to 2015

Operating expense increased by $246.0 million, or 15.1%, in 2016 primarily due to our 20.0% growth in capacity which 

drove increases in operating expenses. 

Our adjusted CASM ex fuel for 2016 decreased by 0.9% as compared to 2015. The decrease on a per-ASM basis was 

primarily a result of a decrease in aircraft rent expense per ASM due to our newer aircraft being purchased under secured debt 
financing rather than being leased through operating leases, as is the case with the older aircraft in our fleet. In addition, we 
purchased seven previously leased aircraft during the twelve months ended December 31, 2016 which contributed to lower 
aircraft rent per ASM. This decrease in aircraft rent was partially offset by higher salaries and wages expense and higher 
operating expense on a per-ASM basis.

50

  
 
 
 
Labor costs in 2016 increased by $95.0 million, or 25.2%, compared to 2015, due mainly to a 16.8% increase in our pilot 

and flight attendant workforce required to operate the 16 new aircraft deliveries in 2016. On both a dollar and per-ASM basis, 
labor costs increased as a result of a non-recurring ratification incentive in the amount o $8.4 million recorded during the first 
quarter of 2016, related to the five-year collective bargaining agreement with our flight attendants, as well as an increase in 
incentive compensation expense resulting from improved metric performance year over year. Scale benefits from overall 
growth as well as larger gauge aircraft and a decrease in our group health care costs partially offset the increase noted above on 
a per-ASM basis. 

Aircraft fuel expense decreased by 3.0% from $461.4 million in 2015 to $447.6 million in 2016. The decrease was 

primarily due to an 18.7% decrease in fuel prices per gallon, mostly offset by an 18.7% increase in fuel gallons consumed. 

The elements of the changes in aircraft fuel expense are illustrated in the following table:

Fuel gallons consumed

Into-plane fuel cost per gallon

Into-plane fuel expense

Realized losses (gains) related to fuel derivative contracts, net

Unrealized losses (gains) related to fuel derivative contracts, net
Aircraft fuel expense (per statement of operations)

Year Ended December 31,

2016

2015

(in thousands, except per
gallon amounts)

Percent
Change

302,781

255,008

$

1.48

$

1.78

$ 447,553

$ 454,747

—

—
$ 447,553

10,580
(3,880)
$ 461,447

18.7 %
(16.9 )%
(1.6 )%
NM

NM
(3.0)%

Gulf Coast Jet indexed fuel is the basis for a substantial majority of our fuel consumption and is impacted by both the 

price of crude oil as well as increases or decreases in refining margins associated with the conversion of crude oil to jet fuel. 
The into-plane fuel cost per gallon decrease of 16.9% was primarily a result of a decrease in jet fuel prices. 

In 2016, we did not have any realized or unrealized gains or losses related to fuel derivatives as we did not enter into 
any fuel derivative instruments during the twelve months ended December 31, 2016. In 2015, total realized loss related to fuel 
derivatives was $10.6 million which represents premiums paid for fuel options that expired during the twelve months ended 
December 31, 2015. There was no cash received from fuel options that settled during 2015. During the twelve months ended 
December 31, 2016, we did not pay any premiums to acquire fuel options. During the twelve months ended December 31, 
2015, we paid $2.5 million in premiums to acquire fuel options. We had unrealized gains of $3.9 million related to mark to 
market adjustments in the fair value of our outstanding fuel derivatives during the twelve months ended December 31, 2015. 

We track economic fuel expense, which we believe is the best measure of the effect fuel prices are currently having on 
our business, because it most closely approximates the net cash outflow associated with purchasing fuel used for our operations 
during the period. We define economic fuel expense as into-plane fuel expense and realized gains or losses on derivative 
contracts. The key difference between aircraft fuel expense, as recorded in our statement of operations, and economic fuel 
expense is unrealized mark-to-market changes in the value of aircraft fuel derivatives outstanding. Many industry analysts 
evaluate airline results using economic fuel expense and it is used in our internal management reporting.

The elements of the changes in economic fuel expense are illustrated in the following table:

Into-plane fuel expense

Realized (gains) and losses related to fuel derivative contracts, net
Economic fuel expense

Fuel gallons consumed
Economic fuel cost per gallon

51

Year Ended December 31,

2016

2015

(in thousands, except per
gallon amounts)

Percent
Change

$ 447,553

$ 454,747

—
$ 447,553

10,580
$ 465,327

302,781
1.48

$

255,008
1.82

$

(1.6 )%
NM
(3.8)%
18.7 %
(18.7)%

 
 
 
 
 
   
 
 
Fuel gallons consumed increased 18.7% as a result of increased operations, as evidenced by a 15.4% increase in block 

hours.

During 2016, aircraft rent expense decreased $9.9 million, or 4.7%, compared to 2015. The decrease in aircraft rent 

expense was primarily driven by the purchase of seven previously leased aircraft made during the twelve months ended 
December 31, 2016. For further discussion on these purchases, refer to "Notes to Financial Statements—3. Special Charges." 
Additionally, we negotiated several lease extensions during 2016 which contributed to lower aircraft rent. On a per-ASM basis, 
aircraft rent expense decreased due to a change in the composition of our aircraft fleet between leased aircraft (for which rent 
expense is recorded under aircraft rent) and purchased aircraft (for which depreciation expense is recorded under depreciation 
and amortization). During 2016, we took delivery of 11 purchased aircraft, which increased capacity but had no effect on 
aircraft rent expense, as these assets were purchased and are being depreciated over their useful life. Had the respective aircraft 
been leased, the change in rent expense, on both a dollar and per-ASM basis, would have been greater than the increase 
currently experienced in depreciation and amortization as a result of these purchases. 

 Landing fees and other rents for 2016 increased by $20.6 million, or 15.7%, compared to 2015 primarily due to a 16.0% 
increase in departures. On a per-ASM basis, landing fees and other rents decreased due to scale benefits from increased volume 
at our airports.

Depreciation and amortization increased by $27.2 million, or 36.8%, compared to the prior year period. The increase on 
both a dollar and per-ASM basis was primarily due to depreciation expense resulting from the purchase of 11 new aircraft and 
the purchase of 7 previously rented aircraft during 2016. 

Maintenance, materials and repair costs increased by $18.1 million, or 22.5%, in 2016, as compared to 2015. The 
increase in maintenance costs on a dollar basis was due to more frequent maintenance checks, year over year, as well as routine 
and ongoing maintenance on a growing fleet. On a per-unit basis, our growth outpaced the increase in maintenance costs during 
the period, as compared to the prior year period. We expect maintenance expense, on a dollar basis, to increase as our fleet 
continues to grow and age, resulting in the need for additional and more frequent repairs over time. 

The increase in distribution expense of $10.1 million, or 11.6%, in 2016 compared to 2015 was primarily due to 
increased sales volume. On a per-ASM basis, distribution costs decreased primarily due to lower average fare resulting in a 
decrease in credit card fees, year over year.

The following table shows our distribution channel usage:

Website . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

63.6% 63.5%

Third-party travel agents . . . . . . . . . . . . . . . . . . . . . . . . . .

Call center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31.7

4.7

32.0

4.5

0.1
(0.3)
0.2

Year Ended
December 31,

2016

2015

Change

Special charges for the year ended 2016 consisted primarily of $37.2 million in lease termination charges recognized 

in connection with the purchase of 7 aircraft previously financed under operating lease agreements. The amount recorded as 
lease termination charges represents the excess of the purchase price paid over the appraised fair value of the aircraft, less 
previously expensed supplemental rent and other non-cash items of $14.8 million. For further discussion on these purchases, 
refer to "Notes to Financial Statements—3. Special Charges." 

Other operating expenses in 2016 increased by $59.6 million, or 28.7%, compared to 2015 due primarily to an increase in 

overall operations. As compared to the prior year period, we increased departures by 16.0% and had 20.6% more passenger 
flight segments, which drove increases in variable operating expenses. The outsourcing of ramp service agents at certain 
stations, completed in the latter part of the second quarter of 2015, also drove increases in other operating expense, on both a 
dollar and per-ASM basis, year over year.

52

  
 
 
 
 
 
Other (Income) Expense

2017 compared to 2016

Other (income) expense, net increased from $24.2 million in 2016 to $35.1 million in 2017 primarily driven by an 

increase in interest expense of $15.6 million which mostly consisted of interest related to the financing of purchased aircraft. As 
of December 31, 2017 and 2016, we had 46 and 29 purchased aircraft financed through secured long-term debt arrangements, 
respectively. Refer to “Notes to Financial Statements—11. Debt and Other Obligations” for additional information. The 
increase noted in interest expense, year over year, was offset by an increase in interest income of $3.5 million and an increase 
in capitalized interest of $1.1 million. Interest income increased by $3.5 million, year over year, as we earned higher interest 
income on our cash, cash equivalents and short-term investments, as compared to the prior year.

2016 compared to 2015

Other (income) expense, net increased from $6.7 million in 2015 to $24.2 million in 2016. This increase was primarily 

driven by an increase in interest expense of $21.3 million, which primarily represented interest related to the financing of 
purchased aircraft, offset by an increase in interest income of $3.2 million and an increase in the capitalization of interest 
of $1.2 million. As of December 31, 2016 and 2015, we had 29 and 18 purchased aircraft financed through secured long-term 
debt arrangements, respectively. Refer to “Notes to Financial Statements—11. Debt and Other Obligations” for additional 
information. Interest income increased by $3.2 million, year over year, as we earned interest income on our cash, cash 
equivalents and short-term investments and on funds required to be held in escrow in accordance with the terms of our Series 
2015-1 EETC.

Income Taxes

In 2017, our effective tax rate was (18.9)% compared to 36.9% in 2016 and 36.9% in 2015. The decrease in tax rate from 
36.9% to (18.9)% is attributed to a revaluation of deferred tax assets and liabilities as a result of the passage of the Tax Cuts and 
Jobs Act. Exclusive of the impacts from the revaluation of our deferred tax assets and liabilities, our effective tax rate would 
have been 37.4% for 2017. As a result of the enactment of Tax Cuts and Jobs Act, we expect our effective tax rate to be 
approximately 24 - 25% in future years.  While we expect our tax rate to be fairly consistent in the near term, it will tend to 
vary depending on recurring items such as the amount of income we earn in each state and the state tax rate applicable to such 
income. Discrete items particular to a given year may also affect our effective tax rates.

53

Quarterly Financial Data (unaudited)

Three Months Ended

March 31,
2016

June 30,
2016

September 30,
2016

December 31,
2016

March 31,
2017

June 30,
2017

September 30,
2017

December 31,
2017

(in thousands, except share and per share amounts)

538,143

$

584,133

$

621,329

$

578,351

$

591,746

$

701,682

$

687,231

$

272,626

265,517

101,299

61,920

0.87

0.86

$

$

$

296,401

287,732

121,835

73,084

1.03

1.03

$

$

$

331,004

290,325

135,216

81,382

1.17

1.17

$

$

$

300,590

277,761

85,311

48,493

0.70

0.70

$

$

$

299,762

291,984

59,405

31,935

0.46

0.46

$

$

$

371,922

329,760

132,736

78,143

1.13

1.12

$

$

$

356,207

331,024

104,104

60,190

0.87

0.87

$

$

$

667,007

338,143

328,864

92,546

250,338

3.64

3.63

71,572,194

71,776,546

70,769,810

70,913,014

69,727,012

69,807,796

69,325,023

69,551,325

69,348,077

69,591,793

69,370,487

69,561,225

69,370,108

69,458,070

68,798,715

68,900,520

Total operating revenue

Passenger. . . . . . . . . . . . . . . . . . . . . . . . .

Non-ticket . . . . . . . . . . . . . . . . . . . . . . . .

Operating income. . . . . . . . . . . . . . . . . . .

Net income . . . . . . . . . . . . . . . . . . . . . . . .

Earnings Per Share:

Basic . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diluted. . . . . . . . . . . . . . . . . . . . . . . . . . .

Weighted average shares outstanding:

Basic . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Diluted. . . . . . . . . . . . . . . . . . . . . . . . . . .

$

$

$

$

54

                     
 
 
 
 
March 31, 
2016

June 30,
 2016

September 30,
2016

December 31,
2016

March 31, 
2017

June 30,
 2017

September 30,
2017

December 31,
2017

Three Months Ended

Other operating statistics

Aircraft at end of period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Average daily Aircraft utilization (hours) . . . . . . . . . . . . . . . . . . . . .

Average stage length (miles) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Departures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Passenger flight segments (thousands) . . . . . . . . . . . . . . . . . . . . . . .

Revenue passenger miles (RPMs) (thousands) . . . . . . . . . . . . . . . . .

Available seat miles (ASMs) (thousands) . . . . . . . . . . . . . . . . . . . . .

Load factor (%) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Average ticket revenue per passenger flight segment ($) . . . . . . . . .

Average non-ticket revenue per passenger flight segment ($) . . . . .

Total operating revenue per ASM (TRASM) (cents) . . . . . . . . . . . .

CASM (cents) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjusted CASM (cents) (1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjusted CASM ex fuel (cents) (2). . . . . . . . . . . . . . . . . . . . . . . . . .

Fuel gallons consumed (thousands) . . . . . . . . . . . . . . . . . . . . . . . . .

Average economic fuel cost per gallon ($) . . . . . . . . . . . . . . . . . . . .

(1)    Reconciliation of CASM to Adjusted CASM:

83

12.8

995

35,160

4,988

5,070,313

5,983,005

84.7

54.65

53.23

10.61

7.30

7.03

5.59

70,550

1.22

87

12.7

971

38,025

5,606

5,549,411

6,419,419

86.4

52.87

51.32

10.53

7.20

7.07

5.30

77,013

1.47

89

12.3

968

38,310

5,674

5,599,370

6,507,204

86.0

58.34

51.17

11.10

7.47

7.35

5.48

78,288

1.56

95

11.7

981

38,019

5,350

5,362,518

6,585,018

81.4

56.19

51.92

8.78

7.49

7.36

5.44

76,930

1.64

Three Months Ended

100

11.9

985

39,330

5,570

5,613,422

6,875,899

81.6

53.82

52.42

10.54

7.74

7.66

5.62

79,064

1.77

104

11.7

982

41,563

6,206

6,219,638

7,294,578

85.3

59.93

53.14

11.28

7.80

7.78

5.83

85,533

1.66

107

11.6

1,006

42,599

6,307

112

11.3

1,023

41,957

6,100

6,452,529

7,681,312

6,319,924

7,741,030

84.0

56.48

52.48

10.65

7.59

7.48

5.42

90,274

2.11

81.6

55.43

53.91

8.62

7.42

7.46

5.20

88,838

1.97

March 31, 
2016

June 30,
 2016

September 30,
 2016

December 31,
 2016

March 31, 
2017

June 30,
 2017

September 30,
 2017

December 31,
 2017

(in
millions)

Per
ASM

(in
millions)

Per
ASM

(in
millions)

Per
ASM

(in
millions)

Per
ASM

(in
millions)

Per
ASM

(in
millions)

Per
ASM

(in
millions)

Per
ASM

(in
millions)

Per
ASM

CASM (cents)...................................................

7.30

7.20

7.47

7.49

7.74

7.80

7.59

Less:

Unrealized losses (gains) related to fuel
derivative contracts ................................ $

Loss on disposal of assets ......................

Special charges.......................................

Supplemental rent adjustment for 
liabilities accrued in prior years that are 
no longer probable

—

0.02

16.2

—

Adjusted CASM (cents) ...................................

—

0.05

8.1

—

— $

—

0.27

—

7.03

—

0.4

7.4

—

— $

0.01

0.13

—

7.07

—

3.0

5.6

—

— $

0.01

0.11

—

7.35

—

1.1

4.8

—

— $

0.05

0.08

—

7.35

—

1.5

—

—

— $

0.02

0.07

—

7.66

—

0.5

7.9

—

— $

0.02

—

—

7.78

— $

0.01

0.10

—

7.48

7.42

—

0.01

—

—

1.1

—

(4.1)

(0.1)

7.46

(2)    Excludes aircraft fuel expense, loss on disposal of assets, special charges and supplemental rent adjustment for liabilities accrued in prior years that are no longer probable.

55

 
 
Liquidity and Capital Resources

Our primary sources of liquidity are cash on hand, cash provided by operations and capital from debt financing. Primary 
uses of liquidity are for working capital needs, capital expenditures, aircraft and engine pre-delivery deposit payments (PDPs), 
debt obligations and maintenance reserves. Our total cash at December 31, 2017 was $800.8 million, an increase of $99.9 
million from December 31, 2016. In addition to cash and cash equivalents, as of December 31, 2017, we had $100.9 million in 
short-term investment securities. 

Currently, one of our largest capital expenditure needs is funding the acquisition costs of our aircraft. Aircraft are 
acquired through debt financing, cash purchases, direct leases or sale leaseback transactions. During the twelve months ended 
December 31, 2017, we purchased 17 aircraft through debt financing transactions and made $152.3 million in debt payments 
(principal, interest and fees) on our outstanding debt obligations. The debt entered into in the current year had maturity dates 
ranging from 2024 to 2030 and interest rates ranging from 3.375% to 4.450%. During 2017, we entered into no sale leaseback 
transactions. In addition, during the twelve months ended December 31, 2017, we purchased one aircraft and one engine, which 
were previously financed under operating lease agreements, for $20.0 million and $8.1 million, respectively, comprised of a 
cash payment of $12.6 million and $3.8 million, respectively, and the non-cash application of maintenance security deposits 
held by the previous lessor of $7.4 million and $4.3 million, respectively. We also took delivery of two aircraft and one engine 
financed through direct operating leases and two engines through cash purchases.

Under our agreement with Airbus for aircraft, and International Aero Engines AG (IAE) and Pratt & Whitney for engines, 

we are required to pay PDPs relating to future deliveries at various times prior to each delivery date. During 2017, we 
paid $149.5 million in PDPs, net of refunds, and $12.3 million of capitalized interest for future deliveries of aircraft and spare 
engines. As of December 31, 2017, we had $253.7 million of PDPs, including capitalized interest, on our balance sheet.

As of December 31, 2017, we had secured financing for ten aircraft, scheduled for delivery in 2018, and did not have 
financing commitments in place for the remaining 49 Airbus firm aircraft orders, scheduled for delivery between 2019 through 
2021. Future aircraft deliveries may be paid in cash, leased or otherwise financed based on market conditions, our prevailing 
level of liquidity, and capital market availability.

In addition to funding the acquisition of our future fleet, we are required to make maintenance reserve payments for some 

of the aircraft in our current fleet. Maintenance reserves are paid to aircraft lessors and are held as collateral in advance of our 
performance of major maintenance activities. During the twelve months ended December 31, 2017, we recorded an increase 
of $37.9 million in maintenance reserves, net of reimbursements, and as of December 31, 2017, we had $326.2 million ($175.6 
million in aircraft maintenance deposits and $150.6 million in long-term aircraft maintenance deposits) on our balance sheet.

On October 25, 2017, our Board of Directors authorized a new repurchase program of up to $100 million in aggregate 
value of shares of our Common Stock, par value $0.0001 per share, from time to time in open market or privately negotiated 
transactions. The authorization will expire on October 25, 2018. The timing and amount of any stock repurchases are subject to 
prevailing market conditions and other considerations. As of December 31, 2017, we had repurchased 1.2 million shares for 
$44.9 million under our stock repurchase program. 

 As of December 31, 2017, we were compliant with our credit card processing agreements, and not subject to any credit 
card holdbacks. The maximum potential exposure to cash holdbacks by our credit card processors, based upon advance ticket 
sales and $9 Fare Club memberships, as of December 31, 2017 and December 31, 2016, was $286.3 million and $234.6 
million, respectively.

Net Cash Flows Provided By Operating Activities. Operating activities in 2017 provided $425.2 million in cash compared 

to $473.7 million provided in 2016. The decrease in cash provided by operating activities is primarily driven by an increase in 
income tax receivable of $69.8 million and a decrease in prepaid income taxes of $72.3 million, year over year. In addition, we 
had higher deferred heavy maintenance payments, year over year. These decreases in cash were partially offset by higher net 
income, as compared to the prior period.

  Operating activities in 2016 provided $473.7 million in cash compared to $473.0 million provided in 2015. Cash 

provided by operating activities remained relatively flat, year over year, despite lower net income, primarily due to the non-
cash lease termination costs in 2016 of $37.2 million recorded within special charges on the statement of operations. Other 
notable differences include $65.0 million of federal income tax payments made in 2015 and refunded in 2016 and lower 
deferral of income taxes, year over year.

56

Net Cash Flows Used In Investing Activities. During 2017, investing activities used $792.0 million, compared to $826.3 

million used in 2016. The decrease was mainly driven by the initial investment in our available-for-sale investment security 
portfolio made in the prior period. During the twelve months ended December 31, 2016, we purchased $100 million of 
available-for-sale investment securities while in the current period all investment purchases were made from reinvestment of 
proceeds generated from the maturity of our investment securities. The decrease was partially offset by an increase in the 
purchase of property and equipment, year over year, resulting from an increase in aircraft and engine deliveries in 2017.

  During 2016, investing activities used $826.3 million, compared to $701.3 million used in 2015. The increase was 
mainly driven by the purchase of short-term available-for-sale investment securities of $100 million made during 2016. In 
addition, there was an increase in paid PDPs, net of refunds, driven by timing of future aircraft deliveries. During 2016, our 
main investing activities were in expenditures for flight equipment consisting primarily of the purchase of 11 new 
aircraft, 7 previously leased aircraft and 1 spare engine.

Net Cash Provided By Financing Activities. During 2017, financing activities provided $466.7 million. We received 
$629.7 million in connection with the debt financing of 17 aircraft delivered during 2017. We spent $46.6 million to repurchase 
common stock primarily under our stock repurchase authorization, which became effective in October 2017, and we paid 
$102.3 million in debt principal payment obligations related to the financing of our aircraft.

  During 2016, financing activities provided $249.9 million. We received $417.3 million in connection with the debt 

financing of 11 aircraft delivered during 2016. We spent $102.5 million to repurchase common stock primarily under our stock 
repurchase authorization, which became effective in October 2015, and we paid $64.4 million in debt principal payment 
obligations related to the financing of our aircraft.

  During 2015, financing activities provided $399.1 million. We received $7.3 million in proceeds from the sale of one 

spare engine as part of a sale leaseback transaction, $536.8 million in connection with the debt financing of 14 aircraft, and 
retained $8.9 million as a result of excess tax benefits related to share-based payments. We spent $15.2 million in debt issuance 
costs to secure the financing of 14 aircraft purchases, spent $112.3 million to repurchase common stock and made $26.4 million 
in debt and capital lease payments.

Commitments and Contractual Obligations

We have contractual obligations and commitments primarily with regard to future purchases of aircraft and engines, 
payment of debt, and lease arrangements. The following table discloses aggregate information about our contractual obligations 
as of December 31, 2017 and the periods in which payments are due (in millions):

Long-term debt (1)

Interest commitments (2)

Capital and operating lease obligations

Flight equipment purchase obligations

Other (3)

2018

2019 - 2020

2021 - 2022

2023 and
beyond

$

121

$

244

107

433

1,596
3

$

240

$

87

346

802
1

934

133

481

8
—

61

251

528
6

967

Total

$

1,539

388

1,511

2,934
10

6,382

Total future payments on contractual obligations

$

$

2,383

$

1,476

$

1,556

$

(1) 

Includes principal only associated with senior and junior term loans, fixed-rate loans, Class A and Class B Series 
2015-1 EETCs, and Class AA, Class A and Class B Series 2017-1 EETCs. Refer to “Notes to the Financial Statements
—11. Debt and Other Obligations.” 

(2)  Related to senior and junior term loans, fixed-rate loans, Class A and Class B Series 2015-1 EETCs, and Class AA, 

Class A and Class B Series 2017-1 EETCs.

(3)  Primarily related to our reservation system, new airport kiosks and our A320ceo seating reconfiguration project. Refer 

to “Notes to the Financial Statements—16. Commitments and Contingencies.”

Some of our master lease agreements provide that we pay maintenance reserves to aircraft lessors to be held as collateral 

in advance of our required performance of major maintenance activities. Some maintenance reserve payments are fixed 
contractual amounts, while others are based on utilization. In addition to the contractual obligations disclosed in the table 
above, we have fixed maintenance reserve payments for these aircraft and related flight equipment, including estimated 

57

 
amounts for contractual price escalations, which are $8.4 million in 2018, $5.9 million in 2019, $5.6 million in 2020, $5.7 
million in 2021, $4.9 million in 2022 and $12.9 million in 2023 and beyond. 

As of December 31, 2017, principal and interest commitments related to our future secured debt financing for ten aircraft 
to be delivered are $19.6 million in 2018, $39.4 million in 2019, $35.8 million in 2020, $30.3 million in 2021, $29.0 million in 
2022, and $301.4 million in 2023 and beyond.

 In September 2015, we executed a lease agreement with Wayne County Airport Authority (the Authority), which owns 

and operates Detroit Metropolitan Wayne County Airport (DTW). Under the lease agreement, we lease a 10-acre site, adjacent 
to the airfield at DTW, in order to construct, operate and maintain an approximately 126,000-square-foot hangar facility. The 
lease agreement has a 30-year term with two 10-year extension options. Upon termination of the lease, title of the project, 
which will be fully depreciated, will automatically pass to the Authority. We completed the project during the first quarter of 
2017 and had no remaining capital commitments related to this project as of December 31, 2017.

Off-Balance Sheet Arrangements

We have significant obligations for aircraft and spare engines as 58 of our 112 aircraft and 11 of our 15 spare engines are 

financed under operating leases and therefore are not reflected on our balance sheets. These leases expire between 2019 and 
2029. Aircraft rent payments were $220.9 million and $213.9 million for 2017 and 2016, respectively. Our aircraft lease 
payments for 57 of our aircraft are fixed-rate obligations. One of our leases provide for variable rent payments, which fluctuate 
based on changes in LIBOR (London Interbank Offered Rate). 

Our contractual purchase commitments consist primarily of aircraft and engine acquisitions through manufacturers. As of 

December 31, 2017, our firm aircraft orders consisted of the following:

2018

2019

2020

2021

Airbus

A320ceo

A320neo

A321ceo

Total

5

1

6

14

16

18

48

5

5

10

15

16

18

59

During the first quarter of 2018, we negotiated revisions to our A320 aircraft order. We originally had 14 A320neo 

aircraft scheduled for delivery in 2019. Pursuant to the revision, 5 of the 14 scheduled A320neo aircraft were converted to 
A320ceo aircraft but remain scheduled to be delivered in 2019. We also have four spare engine orders for V2500 SelectTwo 
engines with IAE and nine spare engine orders for PurePower PW 1100G-JM engines with Pratt & Whitney. Spare engines are 
scheduled for delivery from 2018 through 2023. Committed expenditures for these aircraft and spare engines, including 
estimated amounts for contractual price escalations and aircraft PDPs, are expected to be $528.4 million in 2018, $774.8 
million in 2019, $820.9 million in 2020, $785.1 million in 2021, $16.8 million in 2022, and $7.9 million in 2023 and beyond.

As of December 31, 2017, we had lines of credit related to corporate credit cards of $33.6 million from which we had 

drawn $1.7 million. 

As of December 31, 2017, we had lines of credit with counterparties for both physical fuel delivery and derivatives in the 

amount of $51.5 million. As of December 31, 2017, we had drawn $24.2 million on these lines of credit for physical fuel 
delivery. We are required to post collateral for any excess above the lines of credit if the derivatives are in a net liability 
position and make periodic payments in order to maintain an adequate undrawn portion for physical fuel delivery. As of 
December 31, 2017, we did not hold any derivatives.

As of December 31, 2017, we have $8.6 million in uncollateralized surety bonds and a $35.0 million unsecured standby 
letter of credit facility, representing an off balance-sheet commitment, of which $17.5 million had been drawn upon for issued 
letters of credit.

58

Set forth below is a glossary of industry terms:

GLOSSARY OF AIRLINE TERMS

“Adjusted CASM” means operating expenses, excluding unrealized gains or losses related to fuel derivative contracts, 

out of period fuel federal excise tax, loss on disposal of assets, special charges and supplemental rent adjustment for liabilities 
accrued in prior years that are no longer probable, divided by ASMs.

“Adjusted CASM ex fuel” means operating expenses excluding aircraft fuel expense, loss on disposal of assets, special 
charges and supplemental rent adjustment for liabilities accrued in prior years that are no longer probable, divided by ASMs.

“AFA-CWA” means the Association of Flight Attendants-CWA.

“Air traffic liability” or “ATL” means the value of tickets sold in advance of travel.

“ALPA” means the Air Line Pilots Association, International.

“ASIF” means an Aviation Security Infrastructure Fee assessed by the TSA on each airline.

“Available seat miles” or “ASMs” means the number of seats available for passengers multiplied by the number of miles 

the seats are flown, also referred to as "capacity".

“Average aircraft” means the average number of aircraft in our fleet as calculated on a daily basis.

“Average daily aircraft utilization” means block hours divided by number of days in the period divided by average 

aircraft.

“Average economic fuel cost per gallon” means total aircraft fuel expense, excluding unrealized gains or losses related to 

fuel derivative contracts and out of period fuel federal excise tax, divided by the total number of fuel gallons consumed.

“Average non-ticket revenue per passenger flight segment” means the total non-ticket revenue divided by passenger flight 

segments.

“Average ticket revenue per passenger flight segment” means total passenger revenue divided by passenger flight 

segments.

“Average stage length” represents the average number of miles flown per flight.

“Average yield” means average operating revenue earned per RPM, calculated as total revenue divided by RPMs.

“Block hours” means the number of hours during which the aircraft is in revenue service, measured from the time of gate 

departure before take-off until the time of gate arrival at the destination.

“CASM” or “unit costs” means operating expenses divided by ASMs.

“CBA” means a collective bargaining agreement.

“CBP” means United States Customs and Border Protection.

“DOT” means the United States Department of Transportation.

“EPA” means the United States Environmental Protection Agency.

"EETC" means enhanced equipment trust certificate.

“FAA” means the United States Federal Aviation Administration.

“FCC” means the United States Federal Communications Commission.

"FLL Airport" means the Fort Lauderdale Hollywood International Airport.

“GDS” means Global Distribution System (e.g., Amadeus, Galileo, Sabre and Worldspan).

"IAMAW" means the International Association of Machinists and Aerospace Workers.

59

“Into-plane fuel cost per gallon” means into-plane fuel expense divided by number of fuel gallons consumed.

“Into-plane fuel expense” represents the cost of jet fuel and certain other charges such as fuel taxes and oil.

“Load factor” means the percentage of aircraft seats actually occupied on a flight (RPMs divided by ASMs).

“NMB” means the National Mediation Board.

“OTA” means Online Travel Agent (e.g., Orbitz and Travelocity).

“Passenger flight segments” means the total number of passengers flown on all flight segments.

“PDP” means pre-delivery deposit payment.

“Revenue passenger mile” or “RPM” means one revenue passenger transported one mile. RPMs equals revenue 

passengers multiplied by miles flown, also referred to as "traffic".

“RLA” means the United States Railway Labor Act.

“Total operating revenue per ASM,” “TRASM” or “unit revenue” means operating revenue divided by ASMs.

“TWU” means the Transport Workers Union of America.

“TSA” means the United States Transportation Security Administration.

“ULCC” means “ultra low-cost carrier.”

60

ITEM 7A. 

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk-Sensitive Instruments and Positions

We are subject to certain market risks, including commodity prices (specifically aircraft fuel) and interest rates. We 
purchase the majority of our jet fuel at prevailing market prices and seek to manage market risk through execution of our 
hedging strategy and other means. We have market-sensitive instruments in the form of fixed-rate debt instruments, and 
financial derivative instruments used to hedge our exposure to jet fuel price increases and interest rate increases. We do not 
purchase or hold any derivative financial instruments for trading purposes. The adverse effects of changes in these markets 
could pose a potential loss as discussed below. The sensitivity analysis provided below does not consider the effects that such 
adverse changes may have on overall economic activity, nor does it consider additional actions we may take to mitigate our 
exposure to such changes. Actual results may differ.

Aircraft Fuel. Our results of operations can vary materially due to changes in the price and availability of aircraft fuel. 
Aircraft fuel expense for the years ended December 31, 2017, 2016 and 2015 represented approximately 27.3%, 23.8% and 
28.3% of our operating expenses, respectfully. Volatility in aircraft fuel prices or a shortage of supply could have a material 
adverse effect on our operations and operating results. We source a significant portion of our fuel from refining resources 
located in the southeast United States, particularly facilities adjacent to the Gulf of Mexico. Gulf Coast fuel is subject to 
volatility and supply disruptions, particularly during hurricane season when refinery shutdowns have occurred, or when the 
threat of weather related disruptions has caused Gulf Coast fuel prices to spike above other regional sources. Both jet fuel 
swaps and jet fuel options are used at times to protect the refining price risk between the price of crude oil and the price of 
refined jet fuel, and to manage the risk of increasing fuel prices. Gulf Coast Jet indexed fuel is the basis for a substantial 
majority of our fuel consumption. Based on our annual fuel consumption, a hypothetical 10% increase in the average price per 
gallon of aircraft fuel would have increased into-plane aircraft fuel cost for 2017 by $61.6 million. 

As of December 31, 2017 and 2016, we did not have any outstanding fuel derivatives. We measure our financial 

derivative instruments at fair value. Fair value of the instruments is determined using standard option valuation models. 
Changes in the related commodity derivative instrument cash flows may change by more or less than the amount based upon 
further fluctuations in future prices. Outstanding financial derivative instruments expose us to credit loss in the event of 
nonperformance by the counterparties to the agreements. However, we do not expect the counterparties to fail to meet their 
obligations. 

Interest Rates. We have market risk associated with our short-term investment securities, which had a fair market value 

of $100.9 million and $100.2 million as of December 31, 2017 and December 31, 2016, respectively. We also have market risk 
associated with changing interest rates due to LIBOR-based lease rates on one of our aircraft. A hypothetical 10% change in 
interest rates in 2017 would affect total aircraft rent expense in 2018 by less than $0.1 million per annum. 

Fixed-Rate Debt. As of December 31, 2017, we had $1,539.6 million outstanding in fixed-rate debt related to the 
purchase of 21 Airbus A320 aircraft and 25 Airbus A321 aircraft, which had a fair value of $1,583.2 million. As of December 
31, 2016, we had $1,012.4 million outstanding in fixed-rate debt related to the purchase of 15 Airbus A320 aircraft and 14 
Airbus A321 aircraft, which had a fair value of $1,033.7 million. 

61

ITEM 8. 

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Financial Statements:

Statements of Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Statements of Comprehensive Income. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Balance Sheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Statements of Cash Flows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Statements of Shareholders’ Equity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Notes to Financial Statements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Report of Independent Registered Public Accounting Firm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page

63

64

65

66

67

68

94

62

 
Spirit Airlines, Inc.
Statements of Operations
(In thousands, except per share data)

Operating revenues:
Passenger
Non-ticket

Total operating revenues
Operating expenses:
Aircraft fuel
Salaries, wages and benefits
Aircraft rent
Landing fees and other rents
Depreciation and amortization
Maintenance, materials and repairs
Distribution
Special charges
Loss on disposal of assets
Other operating
Total operating expenses

Operating income
Other (income) expense:
Interest expense
Capitalized interest
Interest income
Other expense

Total other (income) expense

Income before income taxes
Provision (benefit) for income taxes

Net income

Basic earnings per share

Diluted earnings per share

Year Ended December 31,

2017

2016

2015

$1,366,034
1,281,632
2,647,666

$1,200,621
1,121,335
2,321,956

$1,169,338
972,125
2,141,463

615,581
527,959
205,852
180,655
140,152
110,439
113,620
12,629
4,168
347,820
2,258,875

447,553
472,471
201,675
151,679
101,136
98,587
96,627
37,189
4,187
267,191
1,878,295

461,447
377,508
211,531
131,077
73,908
80,448
86,576
673
1,604
207,569
1,632,341

388,791

443,661

509,122

57,302
(13,793)
(8,736)
366
35,139

41,654
(12,705)
(5,276)
528
24,201

20,382
(11,553)
(2,125)
15
6,719

353,652
(66,954)

419,460
154,581

502,403
185,183

$ 420,606

$ 264,879

$ 317,220

$

$

6.08

6.06

$

$

3.77

3.76

$

$

4.39

4.38

See accompanying Notes to Financial Statements.

63

 
 
 
Spirit Airlines, Inc.
Statements of Comprehensive Income
(In thousands)

Net income

Unrealized gain (loss) on interest rate derivative instruments, net of
deferred taxes of $0, $0, and ($550)

Unrealized gain (loss) on short-term investment securities, net of
deferred taxes of ($41), ($13), and $0
Interest rate derivative (gain) loss reclassified into earnings, net of taxes
of $372, $130, and $50

Other comprehensive income (loss)

Comprehensive income

Year Ended December 31,

2017

2016

2015

$

420,606

$

264,879

$

317,220

—

(82)

(37)
(119) $
$

420,487

$

$

—

(23)

224
201

265,080

(910)

—

82
(828)
316,392

$

$

See accompanying Notes to Financial Statements.

64

 
 
 
 
 
 
Spirit Airlines, Inc.
Balance Sheets
(In thousands, except share data)

Assets
Current assets:

Cash and cash equivalents
Short-term investment securities
Accounts receivable, net
Aircraft maintenance deposits, net
Income tax receivable
Prepaid expenses and other current assets

Total current assets

Property and equipment:
Flight equipment
Ground property and equipment
Less accumulated depreciation

Deposits on flight equipment purchase contracts
Long-term aircraft maintenance deposits

Deferred heavy maintenance, net
Other long-term assets
Total assets

Liabilities and shareholders’ equity
Current liabilities:

Accounts payable
Air traffic liability
Current maturities of long-term debt
Other current liabilities

Total current liabilities

Long-term debt, less current maturities
Deferred income taxes
Deferred gains and other long-term liabilities

Shareholders’ equity:

Common stock: Common stock, $0.0001 par value, 240,000,000 shares authorized
at December 31, 2017 and 2016, respectively; 69,770,795 and 73,549,872 issued
and 68,196,964 and 69,326,202 outstanding as of December 31, 2017 and 2016,
respectively
Additional paid-in-capital
Treasury stock, at cost: 1,573,831 and 4,223,670 shares as of December 31, 2017
and 2016, respectively

Retained earnings
Accumulated other comprehensive loss

Total shareholders’ equity

Total liabilities and shareholders’ equity

See accompanying Notes to Financial Statements.

65

December 31, 2017

December 31, 2016

$

$

$

$

$

$

800,849
100,937
49,323
175,615
69,844
83,692
1,280,260

2,291,110
155,166
(207,808)
2,238,468
253,687
150,617
99,915
121,003
4,143,950

22,822
246,404
115,430
262,370
647,026

1,387,498
313,140
19,205

7
360,153

(65,854)
1,484,239
(1,464)
1,777,081

700,900
100,155
41,136
87,035
—
46,619
975,845

1,461,525
126,206
(122,509)
1,465,222
325,688
199,415
75,534
110,223
3,151,927

15,193
206,392
84,354
226,011
531,950

897,359
308,143
19,868

7
551,004

(218,692)
1,063,633
(1,345)
1,394,607

$

4,143,950

$

3,151,927

 
Spirit Airlines, Inc.
Statements of Cash Flows
(In thousands)

Operating activities:
Net income
Adjustments to reconcile net income to net cash provided by operations:

Unrealized losses on open derivative contracts, net
Losses reclassified from other comprehensive income
Stock-based compensation
Allowance for doubtful accounts (recoveries)
Amortization of deferred gains and losses and debt issuance costs
Depreciation and amortization
Deferred income tax expense (benefit)
Loss on disposal of assets
Lease termination costs
Changes in operating assets and liabilities:

Accounts receivable
Aircraft maintenance deposits, net
Long-term deposits and other assets
Deferred heavy maintenance
Income tax receivable
Prepaid income taxes
Accounts payable
Air traffic liability
Other liabilities

Other

Net cash provided by operating activities
Investing activities:

Purchase of available-for-sale investment securities
Proceeds from the maturity of available-for-sale investment securities
Proceeds from sale of property and equipment
Pre-delivery deposits for flight equipment, net of refunds
Capitalized interest
Purchase of property and equipment

Net cash used in investing activities
Financing activities:

Proceeds from issuance of long-term debt
Proceeds from stock options exercised
Payments on debt and capital lease obligations
Proceeds from sale leaseback transactions
Excess tax (deficiency) benefit from equity-based compensation
Repurchase of common stock
Debt issuance costs

Net cash provided by financing activities
Net (decrease) increase in cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period
Supplemental disclosures
Cash payments for:

Interest, net of capitalized interest
Income taxes paid, net of refunds

Non-cash transactions:

Capital expenditures funded by capital lease borrowings

Year Ended December 31,

2017

2016

2015

$

420,606

$

264,879

$

317,220

—
335
8,522
(53)
7,944
140,152
(1,610)
4,168
12,629

(8,134)
(37,930)
(50,803)
(78,237)
(69,844)
—
6,030
40,011
31,074

380
425,240

(107,246)
105,906
—
(149,477)
(12,305)
(628,881)
(792,003)

629,725
45
(102,738)
—
—
(46,580)
(13,740)
466,712
99,949
700,900
800,849

37,902
5,826

—
354
7,105
80
5,732
101,136
86,146
4,187
37,189

(12,951)
(45,869)
(45,558)
(30,222)
—
72,278
(6,823)
(11,582)
47,391

206
473,678

(103,258)
2,842
50
(173,947)
(10,834)
(541,122)
(826,269)

417,275
92
(64,421)
—
(470)
(102,510)
(107)
249,859
(102,732)
803,632
700,900

2,202
132
9,222
12
1,165
73,908
155,614
1,604
—

(5,592)
(32,101)
(22,208)
(9,127)
—
(72,278)
2,706
36,387
14,119

—
472,985

—
—
—
(142,323)
(10,159)
(548,800)
(701,282)

536,780
32
(26,364)
7,300
8,850
(112,261)
(15,192)
399,145
170,848
632,784
803,632

$

$
39,963
(5,579) $

7,061
95,933

$

$
$

(1,370) $

(31) $

—

$

$
$

$

See accompanying Notes to Financial Statements. 

66

 
Spirit Airlines, Inc.
Statements of Shareholders’ Equity
(In thousands)

Common
Stock

Additional
Paid-In
Capital

Treasury Stock

Retained
Earnings
(Accumulated
Deficit)

Accumulated
Other
Comprehensive
Income (Loss)

Total

Balance at December 31, 2014

$

Share-based compensation

Repurchase of common stock

Proceeds from options exercised

Excess tax benefits from share-
based compensation

Changes in comprehensive
income

Net income

Balance at December 31, 2015

$

Share-based compensation

Repurchase of common stock

Proceeds from options exercised

Excess tax deficiency from share-
based compensation

Changes in comprehensive
income

Net income

Balance at December 31, 2016

$

Share-based compensation

Repurchase of common stock

Proceeds from options exercised

Changes in comprehensive
income
Retirement of treasury stock
Net income

7

—

—

—

—

—

—

7

—

—

—

—

—

—

7

—

—

—

—
—
—

$

526,173

$

9,222

—

32

8,850

—

—

(3,921) $
—
(112,261)

—

—

—

—

481,534

$

—

—

—

—

—

317,220

$

544,277

$

(116,182) $

798,754

$

7,105

—

92

(470)

—

—

—
(102,510)

—

—

—

—

—

—

—

—

—

264,879

$

551,004

$

(218,692) $

1,063,633

$

8,522

—

45

—
(199,418)
—

—
(46,580)

—

—
199,418
—

—

—

—

—
—
420,606

(718) $ 1,003,075
9,222

—

—

—

—

(112,261)

32

8,850

(828)
—

(828)

317,220

(1,546) $ 1,225,310
7,105

—

—

—

—

201

—

(102,510)

92

(470)

201

264,879

(1,345) $ 1,394,607
8,522

—

—

—

(119)
—
—

(46,580)

45

(119)
—
420,606

Balance at December 31, 2017

$

7

$

360,153

$

(65,854) $

1,484,239

$

(1,464) $ 1,777,081

See accompanying Notes to Financial Statements.

67

 
 
 
 
 
 
 
1.  Summary of Significant Accounting Policies

Basis of Presentation 

Notes to Financial Statements

Spirit Airlines, Inc. (Spirit or the Company) headquartered in Miramar, Florida, is an ultra low-cost, low-fare airline that 
provides affordable travel opportunities principally throughout the domestic United States, the Caribbean and Latin America. 
The Company manages operations on a system-wide basis due to the interdependence of its route structure in the various 
markets served. As only one service is offered (i.e., air transportation), management has concluded there is only one reportable 
segment.

Certain prior period amounts have been reclassified to conform to the current year's presentation.

Use of Estimates

The preparation of financial statements in accordance with generally accepted accounting principles in the United States 

of America requires the Company's management to make estimates and assumptions that affect the amounts reported in the 
financial statements and accompanying notes. The Company's estimates and assumptions are based on historical experience 
and changes in the business environment. However, actual results may differ from estimates under different conditions, 
sometimes materially. Critical accounting policies and estimates are defined as those that both (i) are most important to the 
portrayal of the Company's financial condition and results and (ii) require management's most subjective judgments. The 
Company's most critical accounting policies and estimates are described below.

Cash and Cash Equivalents

The Company considers all highly liquid investments with maturities of less than three months at the date of acquisition 
to be cash equivalents. Investments included in this category primarily consist of cash and money market funds. Cash and cash 
equivalents are stated at cost, which approximates fair value.

Short-term Investment Securities

The Company's short-term investment securities consist of available-for-sale asset-backed securities with contractual 
maturities of twelve months or less. These securities are stated at fair value within current assets on the Company's balance 
sheet. For all short-term investments, at each reset period or upon reinvestment, the Company accounts for the transaction as 
proceeds from the maturity of short-term investment securities for the security relinquished, and purchase of short-term 
investment securities for the security purchased, in the Company's statements of cash flows. Realized gains and losses on sales 
of investments, if any, are reflected in non-operating income (expense) in the statements of operations. Unrealized gains and 
losses on investment securities are reflected as a component of accumulated other comprehensive income.

Accounts Receivable

Accounts receivable primarily consist of amounts due from credit card processors associated with the sales of tickets and 

amounts due from the Internal Revenue Service related to federal excise fuel tax. The Company records an allowance for 
doubtful accounts for amounts not expected to be collected. The Company estimates the allowance based on historical write-
offs as well as aging trends. The allowance for doubtful accounts was immaterial as of December 31, 2017 and 2016.

In addition, the provision for doubtful accounts and write-offs for 2017, 2016 and 2015 were each immaterial. 

Income Tax Receivable

Income tax receivable consists of amounts due from tax authorities for recovery of income taxes paid in prior years. 

Property and Equipment

Property and equipment is stated at cost, less accumulated depreciation and amortization. Depreciation of operating 

property and equipment is computed using the straight-line method applied to each unit of property. Residual values for new 
aircraft, new engines, major spare rotable parts, avionics and assemblies are generally estimated to be 10%. Property under 
capital leases and related obligations are initially recorded at an amount equal to the present value of future minimum lease 
payments computed using the Company's incremental borrowing rate or, when known, the interest rate implicit in the lease. 
Amortization of property under capital leases is on a straight-line basis over the lease term and is included in depreciation and 
amortization expense. 

68

Notes to Financial Statements—(Continued)

The depreciable lives used for the principal depreciable asset classifications are:

Aircraft, engines and flight simulators
Spare rotables and flight assemblies
Other equipment and vehicles
Internal use software
Capital leases
Leasehold improvements

Buildings

Estimated Useful Life
25 years
7 to 15 years
5 to 7 years
3 to 10 years
Lease term
Lesser of lease term or estimated useful life of the
improvement
Lesser of lease term or 30 years

As of December 31, 2017, the Company had 54 aircraft, 4 spare engines and 1 flight simulator capitalized within flight 

equipment with depreciable lives of 25 years. As of December 31, 2017, the Company had 58 aircraft financed through 
operating leases with lease terms from 8 to 18 years and 11 spare engines financed through operating leases with lease terms 
from 2 to 13 years. 

The following table illustrates the components of depreciation and amortization expense:

Depreciation
Amortization of heavy maintenance
Total depreciation and amortization

Year Ended December 31,

2017

2016

2015

$ 86,297
53,855
$ 140,152

(in thousands)
$ 57,325
43,811
$ 101,136

$ 30,797
43,111
$ 73,908

The Company capitalizes certain internal and external costs associated with the acquisition and development of internal-
use software for new products, and enhancements to existing products, that have reached the application development stage and 
meet recoverability tests. Capitalized costs include external direct costs of materials and services utilized in developing or 
obtaining internal-use software, and labor cost for employees who are directly associated with, and devote time, to internal-use 
software projects. Capitalized computer software, included as a component of ground and other equipment in the 
accompanying balance sheets, net of amortization, was $7.7 million and $9.4 million at December 31, 2017 and 2016, 
respectively. 

We record amortization of capitalized software on a straight-line basis within depreciation and amortization expense in 
the accompanying statements of operations. Amortization of capitalized software costs was $3.1 million, $3.2 million and $3.1 
million for the years ended 2017, 2016 and 2015, respectively. The Company placed in service internal-use software of $1.4 
million, $4.1 million and $4.3 million, during the years ended 2017, 2016 and 2015, respectively. 

Measurement of Asset Impairments

The Company records impairment charges on long-lived assets used in operations when events and circumstances 
indicate that the assets may be impaired, the undiscounted cash flows estimated to be generated by those assets are less than the 
carrying amount of those assets, and the net book value of the assets exceeds their estimated fair value. In making these 
determinations, the Company uses certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and 
(ii) estimated, undiscounted future cash flows expected to be generated by these assets, which are based on additional 
assumptions such as asset utilization, length of service the asset will be used in the Company’s operations, and estimated 
salvage values.

Passenger Revenue Recognition

Tickets sold are initially deferred as “air traffic liability.” Passenger revenue is recognized at time of departure when 
transportation is provided. All tickets sold by the Company are nonrefundable. An unused ticket expires at the date of scheduled 
travel and is recognized as revenue at the date of scheduled travel.

Customers may elect to change their itinerary prior to the date of departure. A service charge is assessed and recognized 

on the date the change is initiated and is deducted from the face value of the original purchase price of the ticket, and the 
original ticket becomes invalid. The amount remaining after deducting the service charge is called a credit shell which 

69

 
 
 
Notes to Financial Statements—(Continued)

generally expires 60 days from the date the credit shell is created and can be used towards the purchase of a new ticket and the 
Company’s other service offerings. The amount of credits expected to expire is recognized as revenue upon issuance of the 
credit and is estimated based on historical experience. Estimating the amount of credits that will go unused involves some level 
of subjectivity and judgment. However, given the relatively short period of time to expiration, this does not have a significant 
impact on the Company's financial statements.

The Company is also required to collect certain taxes and fees from customers on behalf of government agencies and 
airports and remit to the applicable governmental entity or airport on a periodic basis. These taxes and fees include U.S. federal 
transportation taxes, federal security charges, airport passenger facility charges and international arrival and departure taxes. 
These items are collected from customers at the time they purchase their tickets, but are not included in passenger revenue. The 
Company records a liability upon collection from the customer and relieves the liability when payments are remitted to the 
applicable governmental agency or airport.

Frequent Flier Program

Flown Miles. The Company records unrecognized revenue for mileage credits earned by passengers under its FREE 
SPIRIT program, including mileage credits for members with an insufficient number of mileage credits to earn an award, based 
on the estimated incremental cost of providing free travel for credits that are expected to be redeemed. Incremental costs 
include fuel, insurance, security, ticketing and facility charges reduced by an estimate of fees required to be paid by the 
passenger when redeeming the award.

Affinity Card Program. During 2015, the Company extended its agreement with the administrator of the FREE SPIRIT 

affinity credit card program, which was scheduled to expire in April 2016. The renegotiated program was extended through 
2022. As part of the new agreement, the Company received a $10.7 million signing bonus that is being deferred over the 
contract term and has been reflected in the table below as consideration received from credit card mileage programs in 2015. 
This extension is considered a material change and thus at the inception of this new arrangement, the Company evaluated all 
deliverables in the arrangement to determine whether they represent separate units of accounting using the criteria as set forth 
in ASU No. 2009-13. Under the Company's affinity card program, funds received for the marketing of a co-branded Spirit 
credit card and delivery of award miles are accounted for as a multiple-deliverable arrangement. At the inception of the 
arrangement, the Company evaluated all deliverables in the arrangement to determine whether they represent separate units of 
accounting. The Company determined the arrangement had three separate units of accounting: (i) travel miles to be awarded, 
(ii) licensing of brand and access to member lists and (iii) advertising and marketing efforts. Arrangement consideration was 
allocated based on relative selling price. The Company established the estimated selling price for all deliverables that qualified 
for separation. The manner in which the selling price was established was based on a hierarchy of evidence the Company 
considered. Total arrangement consideration was then allocated to each deliverable on the basis of the deliverable’s relative 
selling price. In considering the hierarchy of evidence, the Company first determined whether vendor specific objective 
evidence of selling price or third-party evidence of selling price existed. It was determined by the Company that neither vendor 
specific objective evidence of selling price nor third-party evidence existed due to the uniqueness of the Company’s program. 
As such, the Company developed its best estimate of the selling price for all deliverables. For the award miles, the Company 
considered a number of entity-specific factors when developing the best estimate of the selling price, including the number of 
miles needed to redeem an award, average fare of comparable segments, breakage, restrictions and other charges. For licensing 
of brand and access to member lists, the Company considered both market-specific factors and entity-specific factors, including 
general profit margins realized in the marketplace/industry, brand power, market royalty rates and size of customer base. For 
the advertising element, the Company considered market-specific factors and entity-specific factors, including the Company’s 
internal costs (and fluctuations of costs) of providing services, volume of marketing efforts and overall advertising plan. 
Consideration allocated based on the relative selling price to both brand licensing and advertising elements is recognized as 
revenue when earned and recorded in non-ticket revenue. Consideration allocated to award miles is deferred and recognized 
ratably as passenger revenue over the estimated period the transportation is expected to be provided which is estimated at 17 
months. 

70

Notes to Financial Statements—(Continued)

The following table illustrates total cash proceeds received from the sale of mileage credits and the portion of such 

proceeds recognized in non-ticket revenue immediately as marketing component:

Year Ended
December 31, 2017
December 31, 2016
December 31, 2015

Consideration received
from credit card mile
programs

Portion of proceeds
recognized immediately
as marketing component

$

(in thousands)

$

49,453
48,882
58,005

37,960
36,640
35,938

Total unrecognized revenue from future FREE SPIRIT award redemptions and the sale of mileage credits was $13.8 
million and $15.3 million at December 31, 2017 and 2016, respectively. The current portion of this balance is recorded within 
air traffic liability and the long-term portion of this balance is recorded within deferred gains and other long-term liabilities in 
the accompanying balance sheets.

Non-ticket Revenue Recognition

Non-ticket revenues are generated from air travel-related services for baggage, bookings through the Company’s call 

center or third-party vendors, advance seat selection, itinerary changes and loyalty programs. Non-ticket revenues also consist 
of services not directly related to providing transportation such as the FREE SPIRIT affinity credit card program, $9 Fare Club 
and the sale of advertising to third parties on Spirit’s website and on board aircraft. 

The following table summarizes the primary components of non-ticket revenue and the revenue recognition method 

utilized for each service or product:

Non-ticket revenue

Recognition method

2017

2016

2015

Year Ended December 31,

Baggage
Passenger usage fee
Advance seat selection
Other
Non-ticket revenue

Time of departure
Time of departure
Time of departure

$ 488,434
411,742
131,821
249,635
$1,281,632

(in thousands)
$ 434,269
358,920
110,966
217,180
$1,121,335

$ 381,386
298,092
97,786
194,861
$ 972,125

Charges for services recognized at time of departure are initially recorded as a liability, within air traffic liability, until 

time of departure. The passenger usage fee is charged for tickets sold through the Company’s primary sales distribution 
channels. The primary sales distribution channels for which passenger usage fees are charged include sales through the 
Company’s website, sales through the third-party provided call center and sales through travel agents; the Company does not 
charge a passenger usage fee for sales made at its airport ticket counters. Other non-ticket revenues include revenues from other 
air related charges as well as non-air related charges. Other air related charges include optional services and products provided 
to passengers such as use of the Company’s call center or travel agents, commissions on travel insurance and commissions on 
sale of on-board products, among others. Non-air related charges primarily consist of revenues from advertising on the 
Company’s aircraft and website, the Company’s $9 Fare Club subscription-based membership program and the Company’s 
FREE SPIRIT affinity credit card program. 

Airframe and Engine Maintenance

The Company accounts for heavy maintenance and major overhaul under the deferral method whereby the cost of heavy 
maintenance and major overhaul is deferred and amortized until the earlier of the end of the useful life of the related asset, the 
end of the remaining lease term or the next scheduled heavy maintenance event.

Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense was 

$53.9 million, $43.8 million and $43.1 million for the years ended 2017, 2016 and 2015, respectively. During the years ended 
2017, 2016 and 2015, the Company deferred $78.2 million, $35.4 million and $9.1 million, respectively, of costs for heavy 
maintenance. At December 31, 2017 and 2016, the Company had deferred heavy maintenance balance of $260.5 million and 
$238.3 million, and accumulated heavy maintenance amortization of $160.7 million and $162.8 million, respectively. 

71

 
 
Notes to Financial Statements—(Continued)

The Company outsources certain routine, non-heavy maintenance functions under contracts that require payment on a 
utilization basis, such as flight hours. Costs incurred for maintenance and repair under flight hour maintenance contracts, where 
labor and materials price risks have been transferred to the service provider, are expensed based on contractual payment terms. 
All other costs for routine maintenance of the airframes and engines are charged to expense as performed.

The table below summarizes the extent to which the Company’s maintenance costs are rate capped due to flight hour 

maintenance contracts:

Flight hour-based maintenance expense

Non-flight hour-based maintenance expense

Total maintenance, materials and repairs

Leased Aircraft Return Costs

Year Ended December 31,

2017

2016

2015

(in thousands)

$ 54,802

$ 48,471

$ 41,818

55,637

50,116

38,630

$ 110,439

$ 98,587

$ 80,448

The Company's aircraft lease agreements often contain provisions that require the Company to return aircraft 
airframes, engines and other aircraft components to the lessor in a certain condition or pay an amount to the lessor based on the 
airframe and engine's actual return condition. Lease return costs include all costs that would be incurred at the return of the 
aircraft, including costs incurred to repair the airframe and engines to the required condition as stipulated by the lease. Lease 
return costs could include, but are not limited to redelivery cost, fuel, final inspections, reconfiguration of the cabin, repairs to 
the airframe, painting, overhaul of engines, replacement of components, and checks. Lease return costs are recognized 
beginning when it is probable that such costs will be incurred and they can be estimated. Incurrence of lease return costs 
becomes probable and the amount of those costs can typically be estimated near the end of the lease term. When determining 
probability and estimated cost, there are various other factors which need to be considered such as current condition of the 
aircraft, the age of the aircraft at lease expiration, utilization of engines and other components, the extent of repairs needed at 
return, return locations, current configuration of the aircraft and cost of repairs and materials at the time of return. In addition, 
typically near the lease return date, the lessors may allow reserves to be applied as return condition consideration or pass on 
certain return provisions if they do not align with their current plans to remarket the aircraft. When costs become both probable 
and estimable, they are accrued on a straight-line basis as contingent rent, a component of supplemental rent, through the 
remaining lease term. Management expects return costs to be estimable near the end of the lease term, as such, contingent rent 
for related aircraft will be higher near the end of the lease term. 

Maintenance Reserves

Some of the Company's aircraft and engine master lease agreements provide that the Company pay maintenance 

reserves to aircraft lessors to be held as collateral in advance of the Company's required performance of major maintenance 
activities. A majority of these maintenance reserve payments are calculated based on a utilization measure, such as flight hours 
or cycles, while some maintenance reserve payments are fixed, time-based contractual amounts. These lease agreements 
generally provide that maintenance reserves are reimbursable to the Company upon completion of the maintenance event. 
Some of the master lease agreements do not require that the Company pay maintenance reserves so long as the Company's cash 
balance does not fall below a certain level. As of December 31, 2017, the Company is in full compliance with such 
requirements and does not anticipate having to pay reserves related to these master leases in the future.

Maintenance reserve payments are reflected as aircraft maintenance deposits in the accompanying balance sheets. The 
Company makes certain assumptions to determine the recoverability of maintenance deposits. These assumptions are based on 
various factors such as the estimated time between the maintenance events, the date the aircraft is due to be returned to the 
lessor, the cost of future maintenance events and the utilization of the aircraft is estimated before it is returned to the lessor. 
When it is not probable the Company will recover amounts currently on deposit with a lessor, such amounts are expensed as 
supplemental rent. 

Aircraft Fuel

Aircraft fuel expense includes jet fuel and associated “into-plane” costs, taxes, and oil, and realized and unrealized gains 

and losses associated with fuel derivative contracts, if any.

Derivative Instruments

72

 
 
 
 
Notes to Financial Statements—(Continued)

The Company accounts for derivative financial instruments at fair value and recognizes them in the balance sheet in 
prepaid expenses and other current assets or other current liabilities. For derivatives designated as cash flow hedges, changes in 
fair value of the derivative are generally reported in other comprehensive income and are subsequently reclassified into 
earnings when the hedged item affects earnings. During the third quarter of 2015, the Company settled six forward interest rate 
swaps having a total notional amount of $120 million. These interest rate swaps fixed the benchmark interest rate component of 
interest payments on the debt related to three Airbus A321 aircraft, which the Company took delivery of during the third quarter 
of 2015. These instruments limited the Company's exposure to changes in the benchmark interest rate in the period from the 
trade date through the date of maturity. The interest rate swaps were designated as cash flow hedges. The Company accounts 
for interest rate swaps at fair value and recognizes them in the balance sheet in prepaid expenses and other current assets or 
other current liabilities with changes in fair value recorded within accumulated other comprehensive income (AOCI). Realized 
gains and losses from cash flow hedges are recorded in the statement of cash flows as a component of cash flows from 
operating activities. Subsequent to the issuance of each debt instrument, amounts remaining in AOCI are amortized over the 
life of the fixed-rate debt instrument. 

For the years ended 2017 and 2016, the Company did not hold any fuel derivative instruments. For the year ended 2015, 
the Company did not hold fuel derivative instruments that were designated as cash flow hedges for accounting purposes. As a 
result, changes in the fair value of such fuel derivative contracts were recorded within aircraft fuel expense in the 
accompanying statements of operations. These amounts include both realized gains and losses and mark-to-market adjustments 
of the fair value of unsettled derivative instruments at the end of the period. For additional information, refer to Note 13, 
Financial Instruments and Risk Management.

Advertising

The Company expenses advertising and the production costs of advertising as incurred. Marketing and advertising 
expenses of $5.1 million, $3.2 million and $3.5 million for the years ended 2017, 2016 and 2015, respectively, were recorded 
within distribution expense in the statement of operations.

Income Taxes

The Company accounts for income taxes using the liability method. The Company records a valuation allowance to 
reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all 
of the deferred tax assets will be not realized. As of December 31, 2017, the Company recorded a valuation allowance of $0.5 
million. For additional information, refer to Note 15, Income Taxes. As of December 31, 2016, the Company had no valuation 
allowance recorded against any deferred tax assets.

Stock-Based Compensation

The Company recognizes cost of employee services received in exchange for awards of equity instruments based on the 
fair value of each instrument at the date of grant. Compensation expense is recognized on a straight-line basis over the period 
during which an employee is required to provide service in exchange for an award. The Company has issued and outstanding 
restricted stock awards, stock option awards and performance share awards. Restricted stock awards are valued at the fair value 
of the shares on the date of grant. The fair value of share option awards is estimated on the date of grant using the Black-
Scholes valuation model. The fair value of performance share awards is estimated through the use of a Monte Carlo simulation 
model. For additional information, refer to Note 9, Stock-Based Compensation.

Concentrations of Risk

The Company’s business may be adversely affected by increases in the price of aircraft fuel, the volatility of the price of 
aircraft fuel, or both. Aircraft fuel, one of the Company’s largest expenditures, represented approximately 27%, 24% and 28% 
of total operating expenses in 2017, 2016 and 2015, respectively.

The Company’s operations are largely concentrated in the southeast United States with Fort Lauderdale being the highest 

volume fueling point in the system. Gulf Coast Jet indexed fuel is the basis for a substantial majority of the Company’s fuel 
consumption. Any disruption to the oil production or refinery capacity in the Gulf Coast, as a result of weather or any other 
disaster, or disruptions in supply of jet fuel, dramatic escalations in the costs of jet fuel and/or the failure of fuel providers to 
perform under fuel arrangements for other reasons could have a material adverse effect on the Company’s financial condition 
and results of operations.

The Company’s operations will continue to be vulnerable to weather conditions (including hurricane season or snow and 
severe winter weather), which could disrupt service or create air traffic control problems. These events may result in decreased 
revenue and/or increased costs.

73

Notes to Financial Statements—(Continued)

Due to the relatively small size of the fleet and high utilization rate, the unavailability of one or more aircraft and 
resulting reduced capacity could have a material adverse effect on the Company’s business, results of operations and financial 
condition.

As of December 31, 2017, the Company had four union-represented employee groups that together represented 
approximately 75% of all employees. As of December 31, 2016, the Company had four union-represented employee groups 
that together represented approximately 73% of all employees. A strike or other significant labor dispute with the Company’s 
unionized employees is likely to adversely affect the Company’s ability to conduct business. Additional disclosures are 
included in Note 16, Commitments and Contingencies.

2.  Recent Accounting Developments

Revenue from Contracts with Customers 

In May 2014, the Financial Accounting Standards Board (the FASB) issued Accounting Standards Update (ASU) No. 
2014-09, (ASU 2014-09), "Revenue from Contracts with Customers." The objective of ASU 2014-09 is to establish a single 
comprehensive model for entities to use in accounting for revenue arising from contracts with customers. The new guidance is 
effective for the Company in the first quarter of 2018. Entities have the option to use either a full retrospective or a modified 
retrospective approach to adopt ASU 2014-09. The Company currently anticipates utilizing the full retrospective method of 
adoption allowed by the standard, in order to provide for comparative results in all periods presented, and will adopt the 
standard as of January 1, 2018. While the Company is still evaluating the impact, it currently believes the most significant 
impact of this ASU will be the elimination of the incremental cost method for frequent flier program accounting, which will 
require the Company to re-value and record a liability associated with customer flight miles earned as part of the Company’s 
frequent flier program with a relative fair value approach. While our evaluation is ongoing, the Company currently estimates 
that applying a relative fair value would increase its air traffic liability by approximately $10 million at the date of adoption. 
The Company also expects the classification and timing of recognition of certain ancillary fees to be impacted by the adoption 
of ASU 2014-09. While the Company believes the adoption will not have a significant impact on earnings, the classification of 
certain revenues, such as bags, seats and other travel-related fees may be deemed part of the single performance obligation of 
providing passenger transportation. The Company expects that these revenues currently classified as non-ticket revenue, 
approximately $1 billion annually, will be reclassified to passenger revenue after adoption.

Financial Instruments

In January 2016, the FASB issued ASU 2016-01, “Financial Instruments – Overall (Subtopic 825-10).” ASU 2016-01 
makes several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity 
investments, and requires equity investments with readily determinable fair values to be measured at fair value with changes in 
fair value recognized in net income. ASU 2016-01 is effective for interim and annual periods beginning January 1, 2018 and is 
not expected to have a material impact on the Company’s financial statements. 

Leases

In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)." This standard will require all leases with 
durations greater than twelve months to be recognized on the balance sheet and is effective for the Company in the first quarter 
of 2019, with early adoption permitted. The Company is currently evaluating the new guidance and believes adoption of this 
standard will have a significant impact on its balance sheets although adoption is not expected to significantly change the 
recognition, measurement or presentation of lease expenses within the statements of operations and cash flows. Refer to Note 
16, Commitments and Contingencies for information regarding the Company's undiscounted future lease payments and the 
timing of those payments.

Share-Based Compensation

In March 2016, the FASB issued ASU No. 2016-09, "Improvements to Employee Share-Based Payment Accounting," 
which simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for 
income taxes, forfeitures, and statutory tax withholding requirements, as well as classification on the statement of cash flows. 
The Company adopted this guidance on January 1, 2017. As a result, excess income tax benefits and deficiencies related to 
share-based compensation are now included within income tax expense rather than additional paid in capital. For the twelve 
months ended December 31, 2017, $0.5 million of income tax deficiency related to share-based compensation was included 

74

Notes to Financial Statements—(Continued)

within income tax expense on the Company's statements of operations. Additionally, excess income tax benefits and 
deficiencies for share-based payments are now included in net operating cash flows rather than net financing cash flows. The 
changes have been applied prospectively in accordance with the guidance and prior periods have not been adjusted. 

Accounting for Credit Losses

In June 2016, the FASB issued ASU No. 2016-13, "Financial Instruments  – Credit Losses." The standard requires the use 

of an "expected loss" model on certain types of financial instruments. The standard also amends the impairment model for 
available-for-sale debt securities and requires estimated credit losses to be recorded as allowances instead of reductions to 
amortized cost of the securities. This standard is effective for fiscal years, and interim periods within those years, beginning 
January 1, 2020, with early adoption permitted. The Company is evaluating the new guidance, but does not expect it to have a 
material impact on its financial statements. 

Statement of Cash Flows

In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows." The standard is intended to reduce 
diversity in practice in how certain transactions are classified in the statement of cash flows. This standard is effective for fiscal 
years, and interim periods within those years, beginning January 1, 2018, with early adoption permitted. The Company is 
evaluating the new guidance, but does not expect it to have a material impact on its financial statements. 

3. 

Special Charges

During the twelve months ended December 31, 2017, the Company purchased one engine and one aircraft which were 

previously financed under operating lease agreements. The purchase price of the one engine and one aircraft was $8.1 million 
and $20.0 million, respectively, comprised of a cash payment of $3.8 million and $12.6 million, respectively, and the non-cash 
application of maintenance and security deposits held by the previous lessor of $4.3 million and $7.4 million, respectively. The 
Company estimated the fair value of the engine and aircraft to be $3.1 million and $11.9 million, respectively, and has recorded 
the one purchased engine and one aircraft at fair value within flight equipment on the condensed balance sheets. The Company 
determined the valuation of the engine and aircraft based on a third-party appraisal considering the condition of the engine and 
aircraft (a Level 3 measurement). The Company recognized $4.8 million and $7.9 million as a cost of terminating the lease 
within special charges on the condensed statement of operations, respectively, made up of the excess of the purchase price paid 
over the fair value of the engine and the aircraft, less other non-cash items of $0.2 million and $0.2 million, respectively. 

During the twelve months ended December 31, 2016, the Company purchased seven A319 aircraft which were 
previously financed under operating lease agreements. The purchase price for the seven aircraft was $147.7 million, comprised 
of cash payments of $107.1 million and the application of maintenance and security deposits held by the previous lessors of 
$40.6 million. The Company estimated the fair value of the aircraft to be $95.7 million and has recorded the seven purchased 
aircraft within flight equipment on the balance sheets. The Company determined the valuation of the aircraft based on a third-
party appraisal considering the condition of each aircraft (a Level 3 measurement). The Company recognized $37.2 million as a 
cost of terminating the leases within special charges on the statement of operations, made up of the excess of the purchase price 
paid over the fair value of the aircraft, less previously expensed supplemental rent and other non-cash items of $14.8 million. 

During the twelve months ended December 31, 2015, the Company incurred $0.7 million in special charges related to 

restructuring charges for outsourcing of ramp and passenger services.

4.  Letters of Credit

As of December 31, 2017 and 2016, the Company had a $35.0 million and $25.2 million unsecured standby letter of 

credit facility, of which $17.5 million and $19.7 million had been drawn upon for issued letters of credit, respectively. 

5.  Credit Card Processing Arrangements

The Company has agreements with organizations that process credit card transactions arising from the purchase of air 

travel, baggage charges and other ancillary services by customers. As it is standard in the airline industry, the Company's 
contractual arrangements with credit card processors permit them, under certain circumstances, to retain a holdback or other 
collateral, which the Company records as restricted cash, when future air travel and other future services are purchased via 

75

 
 
  
 
  
Notes to Financial Statements—(Continued)

credit card transactions. The required holdback is the percentage of the Company's overall credit card sales that its credit card 
processors hold to cover refunds to customers if the Company fails to fulfill its flight obligations.   

The Company's credit card processors do not require the Company to maintain cash collateral provided that the Company 
satisfies certain liquidity and other financial covenants. Failure to meet these covenants would provide the processors the right 
to place a holdback, resulting in a commensurate reduction of unrestricted cash. As of December 31, 2017 and 2016, the 
Company was in compliance with such liquidity and other financial covenants in its credit card processing agreements, and the 
processors were holding back no remittances.  

The maximum potential exposure to cash holdbacks by the Company's credit card processors, based upon advance ticket 
sales and $9 Fare Club memberships as of December 31, 2017 and 2016, was $286.3 million and $234.6 million, respectively.

6.  Short-term Investment Securities

The Company's short-term investment securities consist of available-for-sale asset-backed securities with contractual 
maturities of twelve months or less. These securities are stated at fair value within current assets on the Company's balance 
sheet. Realized gains and losses on sales of investments, if any, are reflected in non-operating income (expense) in the 
statements of operations. Unrealized gains and losses on investment securities are reflected as a component of accumulated 
other comprehensive income, (AOCI). 

As of December 31, 2017 and December 31, 2016, the Company had $100.9 million and $100.2 million in short-term 

available-for-sale investment securities, respectively. During the twelve months ended December 31, 2017 and December 31, 
2016, these investments earned interest income at a weighted-average fixed rate of approximately 1.4% and 1.1%, respectively. 
For the twelve months ended December 31, 2017 and December 31, 2016, an unrealized loss of $82 thousand and $23 
thousand, net of deferred taxes of $41 thousand and $13 thousand, respectively, was recorded within AOCI related to these 
investment securities. The Company has not recognized any realized gains or losses related to these securities as the Company 
has not transacted any sales of these securities. As of December 31, 2017 and December 31, 2016, $105 thousand and $23 
thousand, net of tax, respectively, remained in AOCI, related to these instruments.

7.  Accrued Liabilities

Accrued liabilities included in other current liabilities as of December 31, 2017 and 2016 consist of the following: 

Salaries and wages
Airport obligations
Federal excise and other passenger taxes and fees payable
Aircraft maintenance
Fuel
Aircraft and facility lease obligations
Interest payable
Other
Other current liabilities

As of December 31,

2017

2016

(in thousands)

$

$

54,338
56,299
42,036
33,033
25,171
16,992
11,384
23,117
262,370

$

$

54,578
43,989
42,064
30,233
14,828
10,378
8,499
21,442
226,011

8.  Common Stock and Preferred Stock

The Company’s amended and restated certificate of incorporation dated June 1, 2011, authorizes the Company to issue up 
to 240,000,000 shares of common stock, $0.0001 par value per share, 50,000,000 shares of non-voting common stock, $0.0001 
par value per share and 10,000,000 shares of preferred stock, $0.0001 par value per share. All of the Company’s issued and 
outstanding shares of common stock and preferred stock are duly authorized, validly issued, fully paid and non-assessable. The 
Company’s shares of common stock and non-voting common stock are not redeemable and do not have preemptive rights.

76

 
Notes to Financial Statements—(Continued)

Common Stock

Dividend Rights. Holders of the Company’s common stock are entitled to receive dividends, if any, as may be declared 

from time to time by the Company’s board of directors out of legally available funds ratably with shares of the Company’s non-
voting common stock, subject to preferences that may be applicable to any then outstanding preferred stock and limitations 
under Delaware law.

Voting Rights. Each holder of the Company’s common stock is entitled to one vote for each share on all matters submitted 

to a vote of the stockholders, including the election of directors. The Company’s stockholders do not have cumulative voting 
rights in the election of directors. Accordingly, holders of a majority of the voting shares are able to elect all of the directors 
properly up for election at any given stockholders’ meeting.

Liquidation. In the event of the Company’s liquidation, dissolution or winding up, holders of the Company's common 
stock will be entitled to share ratably with shares of the Company’s non-voting common stock in the net assets legally available 
for distribution to stockholders after the payment of all of the Company’s debts and other liabilities and the satisfaction of any 
liquidation preference granted to the holders of any then outstanding shares of preferred stock.

Rights and Preferences. Holders of the Company’s common stock have no preemptive, conversion, subscription or other 

rights and there are no redemption or sinking fund provisions applicable to the Company’s common stock. The rights, 
preferences and privileges of the holders of the Company’s common stock are subject to and may be adversely affected by, the 
rights of the holders of shares of any series of the Company’s preferred stock that the Company may designate in the future.

Non-Voting Common Stock

Dividend Rights. Holders of the Company’s non-voting common stock are entitled to receive dividends, if any, as may be 

declared from time to time by the Company’s board of directors out of legally available funds ratably with shares of the 
Company’s common stock, subject to preferences that may be applicable to any then outstanding preferred stock and 
limitations under Delaware law.

Voting Rights. Shares of the Company’s non-voting common stock are not entitled to vote on any matters submitted to a 

vote of the stockholders, including the election of directors, except to the extent required under Delaware law.

Conversion Rights. Shares of the Company’s non-voting common stock will be convertible on a share-for-share basis into 
common stock at the election of the holder subject to the Company remaining in compliance with applicable foreign ownership 
limitations.

Liquidation. In the event of the Company’s liquidation, dissolution or winding up, holders of the Company’s non-voting 
common stock will be entitled to share ratably with shares of the Company’s common stock in the net assets legally available 
for distribution to stockholders after the payment of all of the Company’s debts and other liabilities and the satisfaction of any 
liquidation preference granted to the holders of any then outstanding shares of preferred stock.

Rights and Preferences. Holders of the Company’s non-voting common stock have no preemptive, subscription or other 

rights, and there are no redemption or sinking fund provisions applicable to the Company’s common stock. The rights, 
preferences and privileges of the holders of the Company’s common stock are subject to and may be adversely affected by, the 
rights of the holders of shares of any series of the Company’s preferred stock that the Company may designate in the future.

As of December 31, 2017 and 2016, there were no shares of non-voting common stock outstanding.

Preferred Stock

The Company’s board of directors has the authority, without further action by the Company’s stockholders, to issue up to 
10,000,000 shares of preferred stock in one or more series and to fix the rights, preferences, privileges and restrictions thereof. 
These rights, preferences and privileges could include dividend rights, conversion rights, voting rights, terms of redemption, 
liquidation preferences, sinking fund terms and the number of shares constituting any series or the designation of such series, 
any or all of which may be greater than the rights of common stock. The Company’s issuance of preferred stock could 
adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend 
payments and payments upon liquidation. In addition, the issuance of preferred stock could have the effect of delaying, 
deferring or preventing a change of control of the Company or other corporate action. As of December 31, 2017 and 2016, 
there were no shares of preferred stock outstanding. 

77

Notes to Financial Statements—(Continued)

9.  Stock-Based Compensation

The Company has stock plans under which directors, officers, key employees and consultants of the Company may be 

granted restricted stock awards, stock options and other equity-based instruments as a means of promoting the Company’s 
long-term growth and profitability. The plans are intended to encourage participants to contribute to, and participate in, the 
success of the Company. 

On December 16, 2014, the Company's Board of Directors approved the 2015 Incentive Award Plan, or 2015 Plan, which 

was subsequently approved by the Company's stockholders on June 16, 2015. The number of shares reserved for issuance or 
transfer pursuant to awards under the 2015 Plan will be increased by the number of shares represented by awards outstanding 
under the Company's former equity plan, the 2011 Equity Incentive Award Plan (2011 Plan), that are forfeited or lapse 
unexercised and which, following the effective date of the 2015 Plan, are not issued under the Company's 2011 Plan. No further 
awards will be granted under the 2011 Stock Plan, and all outstanding awards will continue to be governed by their existing 
terms. As of December 31, 2017 and December 31, 2016, 2,377,650 and 2,358,283 shares of the Company’s common stock, 
respectively, remained available for future issuance under the 2015 Plan. 

Stock-based compensation cost amounted to $8.5 million, $7.1 million and $9.2 million for 2017, 2016 and 2015, 

respectively. During 2017, there was $1.6 million tax expense recognized in income related to stock-based compensation. 
During 2016 and 2015, there was $2.6 million and $3.4 million tax benefit recognized in income related to stock-based 
compensation. 

Restricted Stock and Restricted Stock Units

Restricted stock and restricted stock unit awards are valued at the fair value of the shares on the date of grant. Generally, 

granted shares and units vest over a three or four year graded vesting period. Each restricted stock unit represents the right to 
receive one share of common stock upon vesting of such restricted stock unit. Vesting of restricted stock units is based on time-
based service conditions. In order to vest, the participant must still be employed by the Company, with certain contractual 
exclusions, at each vesting event. Generally, within 30 days after vesting, the shares underlying the award will be issued to the 
participant. In the event a successor corporation in a change in control situation fails to assume or substitute for the restricted 
stock units, the restricted stock units will automatically vest in full as of immediately prior to the consummation of such change 
in control. In the event of death or permanent disability of a participant, the restricted stock units will automatically vest in full. 
Compensation expense is recognized on a straight-line basis over the requisite service period.

A summary of the status of the Company’s restricted stock shares (restricted stock awards and restricted stock unit 

awards) as of December 31, 2017 and changes during the year ended December 31, 2017 is presented below:

Outstanding at December 31, 2016

Granted

Vested

Forfeited

Outstanding at December 31, 2017

Number of
Shares

Weighted-
Average
Grant Date Fair 
Value ($)

274,645

103,030
(88,580)
(22,573)
266,522

49.55

51.68

47.64

55.79

50.48

There were 103,030 and 237,001 restricted stock shares granted during the years ended December 31, 2017 and 
December 31, 2016, respectively. As of December 31, 2017 and December 31, 2016, there was $7.5 million and $9.2 million, 
respectively, of total unrecognized compensation cost related to nonvested restricted stock to be recognized over 2.0 years and 
2.5 years, respectively. 

The weighted-average fair value of restricted stock granted during the years ended December 31, 2017, 2016 and 2015 

was $51.68, $42.91 and $75.40, respectively. The total fair value of restricted stock shares vested during the years ended 
December 31, 2017, 2016 and 2015 was $4.3 million, $6.6 million and $9.2 million respectively.

Stock Options

Stock option awards are granted with an exercise price equal to the fair market value of the Company’s common stock at 

the date of grant, vest over four years of continuous service and have ten-year contractual terms. The fair value of each stock 
option award is estimated on the date of grant using the Black Scholes model. There were no options granted during 2017, 
2016, or 2015. The Company has not granted options since 2011, at which time the Company’s weighted average assumptions 

78

Notes to Financial Statements—(Continued)

for expected volatility, dividends, term and risk-free interest rate were 46.25%, 0%, 6.25 years and 2.03%, 
respectively. Expected volatilities are based on the historical volatility of a group of peer entities within the same industry. The 
expected term of options is based upon the simplified method, which represents the average of the vesting term and the 
contractual term. The risk-free interest rate is based on U.S. Treasury yields for securities with terms approximating the 
expected term of the option.        

Prior to the Company's IPO, to the extent a market price was not available, the fair value of the Company’s common 
stock was estimated using a discounted cash flow analysis and market multiples, based on management’s estimates of revenue, 
driven by assumed market growth rates, and estimated costs as well as appropriate discount rates. These estimates were 
consistent with the plans and estimates management used to manage the Company’s business. 

A summary of share option activity as of December 31, 2017 and changes during the year ended December 31, 2017 is 

presented below:

Outstanding at December 31, 2016

Exercised

Forfeited or expired

Outstanding at December 31, 2017

Exercisable at December 31, 2017

Vested at December 31, 2017

Weighted-
Average
Exercise
Price ($)

Average
Remaining
Contractual
Term
(Years)

Aggregate
Intrinsic
Value
($000)

8.37

7.80

—
8.68

8.68

8.68

3.7

2.7

2.7

2.7

804

380

380

380

Number
of Options

16,250
(5,750)
—
10,500

10,500

10,500

The total intrinsic value of share options exercised during the years ended December 31, 2017, 2016 and 2015 was $0.2 
million, $0.4 million and $0.2 million, respectively. There were no options that vested during the year ended December 31, 
2017 and 2016. The total fair value of options vested during the year ended December 31, 2015 was $4 thousand.

As of December 31, 2017, 2016 and 2015, there was no unrecognized compensation cost related to options as all 

option awards were fully vested. 

Performance Share Awards 

The Company grants certain senior-level executives performance stock units that vest based on either market and time-

based service conditions or performance and time-based service conditions as part of a long-term incentive plan, which are 
referred to herein as performance share awards. The number of shares of common stock underlying each award is determined at 
the end of a three-year performance period. In order to vest, the senior level executive must still be employed by the Company, 
with certain contractual exclusions, at the end of the performance period. Depending on the type of performance stock unit, at 
the end of the performance period, the percentage of the stock units that will vest will be determined by ranking the Company’s 
total shareholder return compared to the total shareholder return of the peer companies identified in the plan or by ranking the 
Company's adjusted operating margin percentage compared to the adjusted operating margin percentage of the peer company's 
identified in the plan. Based on the level of performance, between 0% and 200% of the award may vest. Within 60 days after 
vesting, the shares underlying the award will be issued to the participant. In the event of a change in control of the Company or 
the death or permanent disability of a participant, the payout of any award is limited to a pro-rated portion of such award based 
upon a performance assessment prior to the change-in-control date or date of death or permanent disability.  

The grant date fair value of the performance share awards based on total shareholder return (market condition) is 
determined through the use of a Monte Carlo simulation model. The market condition requirements are reflected in the grant 
date fair value of the award, and the compensation expense, net of forfeitures, for the award is recognized assuming that the 
requisite service is rendered regardless of whether the market conditions are achieved. The Monte Carlo simulation model used 
for valuation of these awards utilizes multiple input variables that determine the probability of satisfying the market condition 
requirements applicable to each award. The inputs utilized for the performance share awards based on total shareholder return 
are as follows: 

79

 
Notes to Financial Statements—(Continued)

Expected volatility factor

Risk free interest rate

Expected term (in years)

Expected dividend yield

Weighted-Average at 
Grant Date for Twelve 
Months Ended 
December 31, 2017

Weighted-Average at 
Grant Date for Twelve 
Months Ended 
December 31, 2016

0.40

1.47 %

2.93

— %

0.39

1.12 %

2.94

— %

For grants awarded in 2017, 2016 and 2015, the volatility was based upon a weighted average historical volatility for the 
Company. The Company chose to use historical volatility to value these awards because historical prices were used to develop 
the correlation coefficients between the Company and each of the peer companies within the peer group in order to model stock 
price movements. The volatilities used were calculated as the remaining term of the performance period at the date of grant. 
The risk-free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms 
equivalent to the remaining performance period. The Company does not intend to pay dividends on its common stock in the 
foreseeable future. Accordingly, the Company used a dividend yield of zero in its model.  

The following table summarizes the Company’s market condition performance share awards for the year ended 

December 31, 2017: 

Outstanding at December 31, 2016

Granted

Vested

Forfeited

Outstanding at December 31, 2017

Number of
Awards

Weighted-Average
Fair Value at Grant
Date ($)

133,907

89,338

(17,592)

(85,294)

120,359

50.54

48.86

50.07

45.64

52.84

The grant date fair value of the performance share awards based on operating margin (performance condition) is based on 

grant date stock price, in accordance with the valuation of performance conditions applicable to this award type. The 
probability of payout for these awards is evaluated at each report date and adjustments are made to stock-based compensation 
expense based on the number of shares deemed probable of issuance upon vesting.

The following table summarizes the Company’s performance condition performance share awards for the year ended 

December 31, 2017:

Outstanding at December 31, 2016

Granted

Vested

Forfeited

Outstanding at December 31, 2017

Number of
Awards

Weighted-Average
Fair Value at Grant
Date ($)

—

37,649

—

(2,142)

35,507

—

46.28

—

55.50

45.72

As of December 31, 2017 and 2016, there was $3.7 million and $4.3 million, respectively, of total unrecognized 

compensation cost related to performance share awards expected to be recognized over 1.52 years and 1.90 years, respectively. 

Treasury Stock

During the year ended December 31, 2017 and 2016, the Company repurchased 1.2 million and 2.4 million shares, 
respectively, for $46.6 million and $102.5 million, respectively. Repurchases of equity securities for these periods include open 
market repurchases made under our stock repurchase programs as well as repurchases made from employees who received 

80

Notes to Financial Statements—(Continued)

restricted stock or performance share awards. During the year ended December 31, 2017, the Company retired 3.9 million 
treasury shares in a total aggregate amount of $199.4 million.

10.   Net Income per Share

The following table sets forth the computation of basic and diluted earnings per common share:

Numerator:

Net income (1)
Denominator:

Year Ended December 31,

2017

2016

2015

 (in thousands, except per share amounts)

$

420,606

$

264,879

$

317,220

Weighted-average shares outstanding, basic

Effect of dilutive stock awards

Adjusted weighted-average shares outstanding, diluted

69,221

156

69,377

70,344

164

70,508

Net Income per Share:

Basic earnings per common share (1)

Diluted earnings per common share (1)

$

$

6.08

6.06

$

$

3.77

3.76

$

$

Anti-dilutive weighted-average shares

85

66

72,208

218

72,426

4.39

4.38

52

(1) During the fourth quarter of 2017, the Company recorded a non-recurring income tax benefit of $199.3 million 
($2.88 and $2.87 per basic and diluted share, respectively) due to the enactment of the Tax Cuts and Jobs Act of 2017. 
For additional information, refer to Note 15, Income Taxes.

11.  Debt and Other Obligations

    Long-term debt 

As of December 31, 2017, the Company held non-public and public debt instruments. During 2017, the Company 

acquired additional debt through the 2017 fixed-rate loans and the 2017-1 EETCs described below. 

2017 Fixed-rate Loans

During 2017, the Company entered into fixed-rate debt, which as of December 31, 2017, provided $527.3 million of 

debt financing for 4 Airbus A320 aircraft and 10 Airbus A321 aircraft. Each loan is secured by a first-priority security interest on 
the individual aircraft. Each loan amortizes on a mortgage-style basis and has a 10 to 12 year term. Loans bear interest payable 
quarterly on a fixed-rate basis. As of December 31, 2017, the Company has taken delivery of all aircraft financed through the 
2017 fixed-rate loans.

2017-1 EETCs

In November 2017, the Company created three separate pass-through trusts, which issued $420.5 million aggregate face 

amount of Series 2017-1 Class AA, Class A and Class B EETCs in connection with the financing of seven new Airbus A320 
aircraft and five new Airbus A321 aircraft. Each class of certificates represents a fractional undivided interest in the respective 
pass-through trusts and is not an obligation of the Company. The proceeds from the issuance of these certificates are initially 
held in escrow by a depositary and, upon satisfaction of certain terms and conditions, are released and used to purchase 
equipment notes which are issued by the Company and secured by the Company's aircraft. Interest on the issued and outstanding 
equipment notes are payable semiannually on February 15 and August 15 of each year, commencing on August 15, 2018, and 
principal on such equipment notes is scheduled for payment on February 15 and August 15 of certain years. Principal payments 

81

 
 
 
 
 
Notes to Financial Statements—(Continued)

commence on August 15, 2018 in the case of five new Airbus A321 scheduled for delivery from February 2018 to March 2018 
and three Airbus A320 scheduled for delivery from December 2017 to January 2018 and on February 15, 2019 for four Airbus 
A320 aircraft scheduled for delivery from April 2018 to October 2018. Issued and outstanding Series AA and Series A 
equipment notes mature in February 2030 and Series B equipment notes mature in February 2026. Issued and outstanding Series 
AA, Series A and Series B equipment notes accrue interest at a rate of 3.375%, 3.650% and 3.800%, respectively. As 
of December 31, 2017, $63.9 million of the proceeds from the sale of the Series 2017-1 EETCs had been used to purchase 
equipment notes in connection with the financing of two Airbus A320 aircraft. The remaining $356.6 million of escrowed 
proceeds held by the pass-through trusts will be used to purchase equipment notes as the remaining 10 new aircraft are delivered. 
Equipment notes that are issued are reported as debt on the Company's condensed balance sheets.

The Company evaluated whether the pass-through trusts formed are variable interest entities (VIEs) required to be 
consolidated by the Company under applicable accounting guidance. The Company determined that the pass-through trusts are 
VIEs and that it does not have a variable interest in the pass-through trusts. Based on this analysis, the Company determined that 
it is not required to consolidate these pass-through trusts.

  Long-term debt is comprised of the following:

As of

Twelve Months Ended December 31,

2017

2016

2017

2016

(in millions)

(weighted-average interest rates)

Fixed-rate senior term loans due through 2027
Fixed-rate junior term loans due through 2022

Fixed-rate loans due through 2029
Fixed-rate class A 2015-1 EETC due through 2028
Fixed-rate class B 2015-1 EETC due through 2024
Fixed-rate class AA 2017-1 EETC due through 2030
Fixed-rate class A 2017-1 EETC due through 2030
Fixed-rate class B 2017-1 EETC due through 2026

Long-term debt

Less current maturities

Less unamortized discount, net

Total

$

$

$

417.9
39.3
518.0
408.6
92.0
37.5
12.5
13.8
1,539.6

115.4

36.7
1,387.5

$

$

$

451.9
47.1
—
409.8
103.6
—
—
—
1,012.4

84.4

30.6
897.4

4.10%
6.90%
3.83%
4.10%
4.45%
3.38%
3.65%
3.80%

4.10%
6.90%
N/A
4.10%
4.45%
N/A
N/A
N/A

The Company's debt financings are collateralized by first priority security interest in the individual aircraft being 

financed. During the year ended December 31, 2017 and 2016, the Company made scheduled principal payments of $102.3 
million and $64.4 million on its outstanding debt obligations, respectively. 

At December 31, 2017, long-term debt principal payments for the next five years and thereafter are as follows:

2018
2019
2020
2021
2022
2023 and beyond
Total debt principal payments

December 31, 2017

(in millions)

$

$

121.0
122.3
121.8
121.5
118.8
934.2
1,539.6

    Interest Expense

Interest expense related to long-term debt consists of the following:

82

Notes to Financial Statements—(Continued)

Senior term loans
Junior term loans
Fixed-rate loans
Class A 2015-1 EETC
Class B 2015-1 EETC
Class AA 2017-1 EETC
Class A 2017-1 EETC
Class B 2017-1 EETC
Commitment fees
Amortization of deferred financing costs

Total

Twelve Months Ended December 31,

2017

2016

(in thousands)

$

$

18,328
3,035
8,610
17,230
4,446
54
19
22
124
5,280
57,148

$

$

19,759
3,568
—
11,509
3,243
—
—
—
127
3,435
41,641

As of December 31, 2017 and 2016, the Company had a line of credit for $33.6 million and $23.6 million related to 
corporate credit cards. Respectively, the Company had drawn $1.7 million and $9.9 million as of December 31, 2017 and 2016, 
which is included in accounts payable.  

As of December 31, 2017 and 2016, the Company had lines of credit with counterparties for derivatives and physical fuel 
delivery in the amount of $51.5 million and $46.5 million, respectively. As of December 31, 2017 and 2016, the Company had 
drawn $24.2 million and $8.0 million on these lines of credit for physical fuel delivery, which is included in other current 
liabilities. The Company is required to post collateral for any excess above the lines of credit if the fuel derivatives are in a net 
liability position and make periodic payments in order to maintain an adequate undrawn portion for physical fuel delivery. As of 
December 31, 2017 and 2016, the Company did not have any outstanding fuel derivatives. 

12.  Leases and Aircraft Maintenance Deposits

The Company leases various types of equipment and property, primarily aircraft, spare engines and airport facilities 
under leases, which expire in various years through 2047. Lease terms are generally 8 to 18 years for aircraft and up to 30 years 
for other leased equipment and property.

Total rental expense for all leases charged to operations for the years ended 2017, 2016 and 2015 was $309.8 million, 
$283.9 million and $282.7 million, respectively. Total rental expense charged to operations for aircraft and engine operating 
leases for the years ended December 31, 2017, 2016 and 2015 was $205.9 million, $201.7 million and $211.5 million, 
respectively. 

Some of the Company’s aircraft and engine master lease agreements provide that the Company pays maintenance 
reserves to aircraft lessors to be held as collateral in advance of the Company’s required performance of major maintenance 
activities. A majority of these maintenance reserve payments are calculated based on a utilization measure, such as flight hours 
or cycles, while some maintenance reserve payments are fixed, time-based contractual amounts. Fixed maintenance reserve 
payments for these aircraft and related flight equipment, including estimated amounts for contractual price escalations, are 
expected to be $8.4 million in 2018, $5.9 million in 2019, $5.6 million in 2020, $5.7 million in 2021, $4.9 million in 2022, and 
$12.9 million in 2023 and beyond. These lease agreements generally provide that maintenance reserves are reimbursable to the 
Company upon completion of the maintenance event. Some of the master lease agreements do not require that the Company 
pay maintenance reserves so long as the Company's cash balance does not fall below a certain level. As of December 31, 2017, 
the Company is in full compliance with those requirements and does not anticipate having to pay reserves related to these 
master leases in the future.

At lease inception and at each balance sheet date, the Company assesses whether the maintenance reserve payments 
required by the master lease agreements are substantively and contractually related to the maintenance of the leased asset. 
Maintenance reserve payments that are substantively and contractually related to the maintenance of the leased asset are 
accounted for as maintenance deposits to the extent they are expected to be recoverable and are reflected as aircraft 
maintenance deposits in the accompanying balance sheets. The Company makes certain assumptions to determine the 
recoverability of maintenance deposits. These assumptions are based on various factors such as the estimated time between the 
maintenance events, the date the aircraft is due to be returned to the lessor, the cost of future maintenance events and the 

83

 
Notes to Financial Statements—(Continued)

utilization of the aircraft is estimated before it is returned to the lessor. When it is not probable the Company will recover 
amounts currently on deposit with a lessor, such amounts are expensed as supplemental rent. 

Supplemental rent is made up of maintenance reserves paid to aircraft lessors that are not probable of being reimbursed 

and probable and estimable return condition obligations. The Company expensed $8.4 million, $9.0 million and $7.7 million of 
supplemental rent recorded within aircraft rent during 2017, 2016 and 2015, respectively. These amounts include $0.4 million, 
$2.2 million and $2.3 million of paid maintenance reserves expensed as supplemental rent during 2017, 2016 and 2015, 
respectively. As of December 31, 2017 and 2016, the Company had short-term and long-term aircraft maintenance deposits of 
$326.2 million and $286.4 million, respectively, on its balance sheets. 

As of December 31, 2017, the Company had a fleet consisting of 112 A320 family aircraft. As of December 31, 2017, the 

Company had 58 aircraft financed under operating leases with lease term expirations between 2020 and 2029 and owned 54 
aircraft of which 8 were purchased off lease and are currently unencumbered. In addition, as of December 31, 2017, the 
Company had 11 spare engines financed under operating leases with lease term expiration dates ranging from 2019 to 2027 and 
owned 4 spare engines of which 1 was purchased off lease and all 4 are currently unencumbered. One of the Company's leased 
aircraft have variable rent payments, which fluctuate based on changes in LIBOR (London Interbank Offered Rate). The 
Company entered into sale leaseback transactions with third-party aircraft lessors for the majority of these aircraft and engine 
leases. Deferred losses resulting from these sale leaseback transactions are included in other long-term assets on the 
accompanying balance sheet. Deferred losses are recognized as an increase to rent expense on a straight-line basis over the 
term of the respective operating leases. Deferred gains are included in deferred gains and other long-term liabilities on the 
accompanying balance sheet. Deferred gains are recognized as a decrease to rent expense on a straight-line basis over the term 
of the respective operating leases. 

During the twelve months ended December 31, 2017, the Company took delivery of 17 aircraft under secured debt 
arrangements, purchased 1 previously leased aircraft, took delivery of 2 aircraft under operating leases and returned 2 aircraft 
to its lessors. In addition, the Company purchased two spare engines, purchased one previously leased engine and took delivery 
of one engine under an operating lease. All of the Company's aircraft and engine leases are accounted for as operating leases. 
Under the terms of the lease agreements, the Company will continue to operate and maintain the aircraft. Payments under the 
lease agreements are fixed for the term of the lease. The lease agreements contain standard termination events, including 
termination upon a breach of the Company's obligations to make rental payments and upon any other material breach of the 
Company's obligations under the leases, and standard maintenance and return condition provisions. Upon a termination of the 
lease due to a breach by the Company, the Company would be liable for standard contractual damages, possibly including 
damages suffered by the lessor in connection with remarketing the aircraft or while the aircraft is not leased to another party. 

The majority of the Company's capital lease obligations relate to the lease of computer equipment used by the Company's 

flight crew. Payments under this lease agreement are fixed for the 3-year term of the lease which commenced in the second 
quarter of 2017.

Future minimum lease payments under capital leases and noncancellable operating leases with initial or remaining terms 

in excess of one year at December 31, 2017 were as follows:

Capital Leases

Aircraft
and Spare Engine
Leases

Property Facility
Leases

Total Operating and
Capital Lease
Obligations

Operating Leases

(in thousands)

204,292
189,106
180,842
170,643
150,212
419,908
1,315,003

$

$

45,737
36,852
25,870
12,740
11,931
61,211
194,341

$

$

250,566
226,462
206,900
183,411
162,143
481,119
1,510,601

2018
2019
2020
2021
2022
2023 and thereafter
Total minimum lease payments
Less amount representing interest
Present value of minimum lease
payments

Less current portion
Long-term portion

$

$

$

$

537
504
188
28
—
—
1,257
94

1,163
476
687

$

$

84

Notes to Financial Statements—(Continued)

13.  Financial Instruments and Risk Management

As part of the Company’s risk management program, the Company from time to time uses a variety of financial 

instruments to reduce its exposure to fluctuations in the price of jet fuel and interest rates. The Company does not hold or issue 
derivative financial instruments for trading purposes.

The Company is exposed to credit losses in the event of nonperformance by counterparties to these financial instruments. 

The Company periodically reviews and seeks to mitigate exposure to the financial deterioration and nonperformance of any 
counterparty by monitoring the absolute exposure levels, each counterparty's credit ratings and the historical performance of the 
counterparties relating to hedge transactions. The credit exposure related to these financial instruments is limited to the fair 
value of contracts in a net receivable position at the reporting date. The Company also maintains security agreements that 
require the Company to post collateral if the value of selected instruments falls below specified mark-to-market thresholds. The 
Company records financial derivative instruments at fair value, which includes an evaluation of each counterparty's credit risk. 
As of December 31, 2017 and 2016, the Company did not hold any derivatives. 

Fuel Derivative Instruments

From time to time, the Company may enter into fuel derivative contracts in order to mitigate the risk of future volatility in 

fuel prices. The Company's fuel derivative contracts, if any, generally consist of United States Gulf Coast jet fuel swaps (jet 
fuel swaps) and United States Gulf Coast jet fuel options (jet fuel options). Both jet fuel swaps and jet fuel options are used at 
times to protect the refining price risk between the price of crude oil and the price of refined jet fuel, and to manage the risk of 
increasing fuel prices. Fair value of the instruments is determined using standard option valuation models. 

The Company accounts for any fuel derivative contracts at fair value and recognizes them in the balance sheet in prepaid 

expenses and other current assets or other current liabilities. The Company did not enter into any fuel derivative instruments 
during 2017 and 2016. The Company did not elect hedge accounting on any fuel derivative instruments entered into during 
2015 and, as a result, changes in the fair value of these fuel derivative contracts are recorded in aircraft fuel expense.

The following table summarizes the components of aircraft fuel expense for the years ended December 31, 2017, 2016 

and 2015:

Into-plane fuel cost
Realized losses (gains) related to fuel derivative contracts, net
Unrealized losses (gains) related to fuel derivative contracts, net
Aircraft fuel

Year Ended December 31,

2017

2016

2015

$

$

615,581
—
—
615,581

(in thousands)
447,553
$
—
—
447,553

$

$

$

454,747
10,580
(3,880)
461,447

Premiums and settlements received or paid on fuel derivative contracts, if any, are reflected in the accompanying 

statements of cash flows in net cash provided by operating activities. 

As of December 31, 2017 and 2016, the Company did not have any outstanding fuel derivatives and had no fuel hedging 

activity for the twelve months ended December 31, 2017.

Interest Rate Swaps

During 2015, the Company settled six forward interest rate swaps that were designed to fix the benchmark interest rate 

component of the interest payments on the debt related to three Airbus A321 aircraft, which the company took delivery of 
during the third quarter of 2015. These instruments limited the Company's exposure to changes in the benchmark interest rate 
in the period from the trade date through the date of maturity. The interest rate swaps were designated as cash flow hedges. The 
Company accounts for these interest rate swaps at fair value and recognizes them in the balance sheet in prepaid expenses and 
other current assets or other current assets or other current liabilities with changes in fair value recorded within accumulated 
other comprehensive income (AOCI). As of December 31, 2017 and 2016, the Company did not have any outstanding interest 
rate swaps.

85

 
Notes to Financial Statements—(Continued)

 Realized gains and losses from cash flow hedges are recorded in the statement of cash flows as a component of cash 
flows from operating activities. Subsequent to the issuance of each debt instrument, amounts remaining in AOCI are amortized 
over the life of the fixed-rate debt instrument. During the twelve months ended December 31, 2017 and December 31, 2016, 
there were no unrealized gains or losses recorded within AOCI related to these instruments as they settled in 2015. During the 
twelve months ended December 31, 2017, the Company reclassified interest rate swap losses of $335 thousand, into earnings, 
resulting in a gain of $37 thousand, net of tax of $372 thousand. During the twelve months ended December 31, 2016, the 
Company reclassified interest rate swap losses of $354 thousand, into earnings, resulting in a loss of $224 thousand, net of tax 
of $130 thousand. As of December 31, 2017 and December 31, 2016, $1.4 million and $1.3 million, net of tax, remained in 
AOCI related to these instruments.

14.  Defined Contribution 401(k) Plan

The Company sponsors three defined contribution 401(k) plans, Spirit Airlines, Inc. Employee Retirement Savings Plan 
(first plan), Spirit Airlines, Inc. Pilots’ Retirement Savings Plan (second plan) and Spirit Airlines, Inc. Puerto Rico Retirement 
Savings Plan (third plan). The first plan is for all employees that are not covered by the pilots’ collective bargaining agreement, 
who have at least 60 days of service and have attained the age of 21. The Company may make a Qualified Discretionary 
Contribution, as defined in the plan, or provide matching contributions to this plan. For flight attendants and dispatchers 
participating in the first plan, the Company currently matches 100% of the employee's contribution, up to a maximum of 6% of 
the employee's annual compensation. Prior to May 1, 2016, the Company matched 50% of the flight attendant and dispatcher's 
contribution, up to a maximum of 6% of the employee's annual compensation. For all other employees participating in the first 
plan, the Company matches 50% of the employee’s contribution, up to a maximum of 6% of the employee’s annual 
compensation.

The second plan is for the Company’s pilots, and contains the same service requirements as the first plan. Throughout 

2017, the Company matched 100% of the pilot's contribution, up to 9% of the individual pilot's annual compensation. Both the 
first and the second plans are subject to the annual IRS elective deferral limit, which was $18,000 for 2017.

The third plan is for all Company employees residing in Puerto Rico and was adopted on April 16, 2012. It contains the 

same service requirements as the first and second plans. For pilots participating in the Puerto Rico plan, the Company matched 
100% of their contribution, up to 9% of the individual pilot's annual compensation, but subject to the annual Puerto Rico pre-
tax elective deferral limit, which was $15,000 for 2017. For all other employees participating in the Puerto Rico plan, the 
Company matches 50% of the employee's contribution, up to 6% of the employee's annual compensation.

Matching contributions made to all plans were $19.6 million, $16.2 million and $12.5 million in 2017, 2016 and 2015, 

respectively, and were included within salaries, wages and benefits in the accompanying statements of operations. 

15.  Income Taxes

Significant components of the provision for income taxes from continuing operations are as follows: 

Current:

Federal
State and local
Foreign

Total current expense (benefit)
Deferred:

Federal
State and local

Total deferred expense (benefit)
Total income tax expense (benefit)

Year Ended December 31,

2017

2016

2015

(in thousands)

(68,601) $
515
2,742
(65,344)

(10,370)
8,760
(1,610)
(66,954) $

60,079
6,322
2,034
68,435

82,455
3,691
86,146
154,581

$

$

21,632
6,702
1,235
29,569

149,583
6,031
155,614
185,183

$

$

86

 
Notes to Financial Statements—(Continued)

The income tax provision differs from that computed at the federal statutory corporate tax rate as follows: 

Expected provision at federal statutory tax rate

State tax expense, net of federal benefit

Income tax credits
Revaluation of deferred taxes
Other
Total income tax expense (benefit)

Year Ended December 31,

2017

2016

2015

35.0 %

1.7 %
— %
(56.3)%
0.7 %
(18.9)%

35.0%

1.6%
—%
—%
0.3%
36.9%

35.0%

1.7%
—%
—%
0.2%
36.9%

The Company accounts for income taxes using the asset and liability method. Deferred taxes are recorded based on 

differences between the financial statement basis and tax basis of assets and liabilities and available tax loss and credit 
carryforwards. At December 31, 2017 and 2016, the significant components of the Company's deferred taxes consisted of the 
following: 

Deferred tax assets:

Foreign tax credits
Deferred revenue
Nondeductible accruals
Deferred manufacturing credits
Accrued maintenance
Equity compensation
Other
Valuation allowance

Deferred tax assets
Deferred tax liabilities:

Deferred gain (loss) on leases, net
Accrued rent
Prepaid expenses
Property, plant and equipment
Deferred financing costs
Accrued aircraft and engine maintenance

Deferred tax liabilities
Net deferred tax assets (liabilities)

December 31,

2017

2016

(in thousands)

$

5,980
1,631
10,107
258
1,991
2,392
5,555
(454)
27,460

—
3,057
20,547
910
1,854
3,882
4,026
—
34,276

1,605
12,055
754
298,703
225
27,258
340,600
(313,140) $

2,435
14,025
1,217
278,872
5,358
40,512
342,419
(308,143)

$

$

On December 22, 2017, the Tax Cuts and Jobs Act (“TCJA”) was enacted.  The TCJA reduces the statutory federal tax 

rate from 35.0% to 21.0% effective for tax year 2018 in addition to various other tax law changes that impact the Company.  
Pursuant to ASC 740, the Company is required to recognize the effects of changes in tax laws and rates on deferred tax assets 
and liabilities upon enactment. The Company reasonably estimated and recorded a provisional reduction in net deferred tax 
liabilities of $196.0 million upon enactment of the TCJA as written. In addition, the Company generated $6.3 million of 
alternative minimum tax credits, which are recorded within other long-term assets on the balance sheet. These provisional 
amounts may be affected as the Company gains a more thorough understanding of the tax law, including those related to the 
deductibility of acquired assets, state tax treatment and amounts related to employee compensation.

In assessing the realizability of the deferred tax assets, management considered whether it is more likely than not that 
some or all of the deferred tax assets would be realized. In evaluating the Company’s ability to utilize its deferred tax assets, it 
considered all available evidence, both positive and negative, in determining future taxable income on a jurisdiction by 
jurisdiction basis. The Company recorded a valuation allowance of $0.5 million against certain deferred tax assets related to 
equity compensation for executives due to changes in tax law resulting from the TCJA. 

87

 
 
 
Notes to Financial Statements—(Continued)

At December 31, 2017, the Company has $6.0 million of foreign tax credits and $14.8 million of state net operating 

losses available, that may be applied against future tax liabilities. The foreign tax credits will start to expire in 2025 and the 
state net operating losses will start to expire in 2027.

In accordance with ASU No. 2016-09, excess income tax benefits and deficiencies related to share-based 

compensation are now included within income tax expense rather than additional paid in capital. For the twelve months ended 
December 31, 2017, $0.5 million of income tax deficiency related to share-based compensation was included within income tax 
expense. Prior to the adoption of ASU No. 2016-09, the excess tax benefit/(deficiency) was recorded as a reduction/(increase) 
to income tax payable and a corresponding entry to additional paid in capital. The Company recognized an excess tax 
deficiency of $0.5 million and an excess tax benefit of $8.9 million for tax years ended December 31, 2016 and 2015, 
respectively.   

The Company's policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of 

selling, general and administrative expenses. For tax years ended December 31, 2017, 2016 and 2015, the Company did not 
recognize any liabilities for uncertain tax positions nor any interest and penalties on unrecognized tax benefits. 

For tax years 2017, 2016 and 2015, the entire income before income taxes for the Company is subject to domestic income 

taxes.  

The Company files its tax returns as prescribed by the tax laws of the jurisdictions in which it operates. The Company's 

federal income tax returns for 2014 through 2016 tax years are still subject to examination in the U.S. Various state and foreign 
jurisdiction tax years remain open to examination. The Company believes that any potential assessment would be immaterial to 
its financial statements.

16.  Commitments and Contingencies   

Aircraft-Related Commitments and Financing Arrangements 

The Company’s contractual purchase commitments consist primarily of aircraft and engine acquisitions through 
manufacturers. During the first quarter of 2017, the Company negotiated revisions to its A320 aircraft order. The Company 
originally had four A320neo aircraft scheduled for delivery in 2018 of which two were converted to A320ceo aircraft and 
delivered in 2017, and the remaining two are deferred until 2019. As of December 31, 2017, the Company's firm aircraft orders 
consisted of the following:

2018

2019

2020

2021

Airbus

A320ceo

A320neo

A321ceo

Total

5

1

6

14

16

18

48

5

5

10

15

16

18

59

During the first quarter of 2018, the Company negotiated revisions to its A320 aircraft order. The Company originally had 

14 A320neo aircraft scheduled for delivery in 2019. Pursuant to the revision, 5 of the 14 scheduled A320neo aircraft were 
converted to A320ceo aircraft but remain scheduled to be delivered in 2019. The Company also has four spare engine orders for 
V2500 SelectTwo engines with IAE and nine spare engine orders for PurePower PW 1100G-JM engines with Pratt & Whitney. 
Spare engines are scheduled for delivery from 2018 through 2023. Purchase commitments for these aircraft and engines, 
including estimated amounts for contractual price escalations and pre-delivery payments, are expected to be $528.4 million in 
2018, $774.8 million in 2019, $820.9 million in 2020, $785.1 million in 2021, $16.8 million in 2022, and $7.9 million in 2023 
and beyond. As of December 31, 2017, the Company had secured financing commitments of $356.6 million for ten aircraft, 
scheduled for delivery in 2018, and did not have financing commitments in place for the remaining 49 Airbus aircraft currently 
on firm order, which are scheduled for delivery in 2019 through 2021. 

Interest commitments related to the secured debt financing of 46 delivered aircraft as of December 31, 2017 are $60.8 

million in 2018, in $56.2 million 2019, $51.0 million in 2020, $45.8 million in 2021, $40.7 million in 2022, and $133.3 million 
in 2023 and beyond. For principal commitments related to these financed aircraft, refer to Note 11, Debt and Other Obligations. 

88

 
Notes to Financial Statements—(Continued)

As of December 31, 2017, principal and interest commitments related to the Company's future secured debt financing of ten 
undelivered aircraft under the Series 2017-1 EETC are approximately $19.6 million in 2018, $39.4 million in 2019, $35.8 
million in 2020, $30.3 million in 2021, $29.0 million in 2022, and $301.4 million in 2023 and beyond. 

In July 2015, the Company executed an upgrade service agreement with Airbus Americas Customer Services Inc. 

(Airbus) to reconfigure the seating and increase capacity in 40 of the Company’s A320ceos from 178 to 182 seats 
(reconfiguration). The reconfiguration of the aircraft commenced in the first quarter of 2016 and is expected to be completed in 
the second quarter of 2018 for a remaining committed cost of $0.6 million as of December 31, 2017. These amounts will be 
capitalized within flight equipment on the balance sheet.

In September 2015, the Company executed a lease agreement with Wayne County Airport Authority (the Authority), 

which owns and operates Detroit Metropolitan Wayne County Airport (DTW). Under the lease agreement, the Company leases 
a 10-acre site, adjacent to the airfield at DTW, in order to construct, operate and maintain an approximately 126,000-square-foot 
hangar facility (the project). The project allows for the development of a maintenance hangar in order to fulfill the requirements 
of the Company's growing fleet and will reduce dependence on third-party facilities and contract line maintenance. The lease 
agreement has a 30-year term with two 10-year extension options. Upon termination of the lease, title of the project, which will 
be fully depreciated, will automatically pass to the Authority. The Company completed the project during the first quarter of 
2017 and has no remaining capital commitments related to this project as of December 31, 2017.

The Company is contractually obligated to pay the following minimum guaranteed payments for its reservation system, 

new airport kiosks and other miscellaneous subscriptions and services as of December 31, 2017: $5.9 million in 2018, $1.8 
million in 2019, $1.3 million in 2020, $0.7 million in 2021, $0.4 million in 2022, and $0.0 million in 2023 and beyond. The 
Company's current agreement with its reservation system provider expires in 2018.

Litigation

The Company is subject to commercial litigation claims and to administrative and regulatory proceedings and reviews that 

may be asserted or maintained from time to time. The Company believes the ultimate outcome of such lawsuits, proceedings 
and reviews will not, individually or in the aggregate, have a material adverse effect on its financial position, liquidity or results 
of operations.

Employees

The Company has four union-represented employee groups that together represent approximately 75% of all employees at 

December 31, 2017. The Company had four union-represented employee groups that together represented approximately 73% 
of all employees at December 31, 2016. The table below sets forth the Company's employee groups and status of the collective 
bargaining agreements as of December 31, 2017. 

Employee Groups
Pilots

Flight Attendants

Dispatchers

Representative
Air Line Pilots Association, International (ALPA)

Association of Flight Attendants (AFA-CWA)

Transport Workers Union (TWU)

Ramp Service Agents

International Association of Machinists and Aerospace Workers
(IAMAW)

   Amendable Date
   August 2015
   May 2021
   August 2018
June 2020

Percentage of
Workforce
26%

44%

1%

4%

In August 2015, the Company's collective bargaining agreement with its pilots, represented by ALPA, became amendable. 

In June 2016, ALPA requested the services of the National Mediation Board (NMB) to facilitate negotiations for an amended 
agreement and the Company joined ALPA in the request. In January 2018, under the guidance of the NMB assigned mediators, 
the parties reached a tentative amendable agreement which is subject to ratification by the pilot group. The ratification vote will 
take place throughout February 2018. The current tentative agreement is for a five-year contract which includes a one-time $75 
million ratification incentive and other negotiated contractual provisions. The Company can provide no assurance that the 
tentative agreement will be approved. Under the Railway Labor Act (RLA), the parties' current agreement remains in effect 
until an amended agreement is ratified.

In March 2016, under the supervision of the NMB, the Company and AFA-CWA reached a tentative agreement for a five-

year contract with the Company's flight attendants. In May 2016, the flight attendants voted to approve the new five-year 
contract with the Company. In connection with this agreement, the Company paid a $9.6 million ratification incentive payment 
to the flight attendants recorded within salaries, wages and benefits in the statement of operations. Of the total ratification 
incentive, $8.4 million was recorded during 2016 as the remaining $1.2 million was previously accrued in 2015.

89

 
  
  
  
  
Notes to Financial Statements—(Continued)

In December 2017, the Professional Airline Flight Control Association (“PAFCA”) filed an application with the NMB 

seeking to represent our dispatchers, who are currently represented by the TWU. In January 2018, the NMB determined that a 
representation election would be held. The voting period for the representation election will close on February 20, 2018.  

The Company is self-insured for health care claims, subject to a stop-loss policy, for eligible participating employees and 

qualified dependent medical claims, subject to deductibles and limitations. The Company’s liabilities for claims incurred but 
not reported are determined based on an estimate of the ultimate aggregate liability for claims incurred. The estimate is 
calculated from actual claim rates and adjusted periodically as necessary. The Company has accrued $3.9 million and $5.7 
million, for health care claims as of December 31, 2017, and 2016, respectively, recorded within other current liabilities on the 
Company's balance sheet.

17.  Fair Value Measurements

Under ASC 820, Fair Value Measurements and Disclosures, disclosures relating to how fair value is determined for 
assets and liabilities are required, and a hierarchy for which these assets and liabilities must be grouped is established, based on 
significant levels of inputs, as follows:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices 

in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for 
substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of 

the assets or liabilities.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) 

in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on 
the measurement date. The Company utilizes several valuation techniques in order to assess the fair value of the Company’s 
financial assets and liabilities. 

Fuel Derivative Instruments

From time to time, the Company may enter into fuel derivative contracts in order to mitigate the risk of future volatility 

in fuel prices. The Company’s fuel derivative contracts generally consist of jet fuel swaps and jet fuel options. These 
instruments are valued using energy and commodity market data, which is derived by combining raw inputs with quantitative 
models and processes to generate forward curves and volatilities.

The Company utilizes the market approach to measure fair value for its fuel derivative instruments, if any. The market 

approach uses prices and other relevant information generated by market transactions involving identical or comparable assets 
or liabilities.

The Company does not elect hedge accounting on its fuel derivative instruments, if any. As a result, the Company records 

the fair value adjustment of any fuel derivatives in the accompanying statement of operations within aircraft fuel and on the 
balance sheet within prepaid expenses and other current assets or other current liabilities, depending on whether the net fair 
value of the derivatives is in an asset or liability position as of the respective date. Fair values of any fuel derivative instruments 
are determined using standard option valuation models. The Company also considers counterparty risk and its own credit risk 
in its determination of all estimated fair values. The Company offsets fair value amounts recognized for any derivative 
instruments executed with the same counterparty under a master netting arrangement. The Company determines fair value of 
any jet fuel options utilizing an option pricing model based on inputs that are either readily available in public markets or can 
be derived from information available in publicly quoted markets. The Company has consistently applied these valuation 
techniques in all periods presented and believes it has obtained the most accurate information available for the types of 
derivative contracts it holds. 

The fair value of the Company's jet fuel swaps, if any, are determined based on inputs that are readily available in public 

markets or can be derived from information available in publicly quoted markets; therefore, the Company categorizes these 
instruments as Level 2. Due to the fact that certain inputs utilized to determine the fair value of jet fuel options are 
unobservable (principally implied volatility), the Company categorizes these derivatives as Level 3. Implied volatility of a jet 
fuel option is the volatility of the price of the underlying commodity that is implied by the market price of the option based on 

90

Notes to Financial Statements—(Continued)

an option pricing model. Thus, it is the volatility that when used in a particular pricing model, yields a theoretical value for the 
option equal to the current market price of that option. Implied volatility, a forward-looking measure, differs from historical 
volatility because the latter is calculated from known past returns. At each balance sheet date, the Company substantiates and 
adjusts unobservable inputs. The Company routinely assesses the valuation model's sensitivity to changes in implied volatility. 
Based on the Company's assessment of the valuation model's sensitivity to changes in implied volatility, it concluded that 
holding other inputs constant, a significant increase (decrease) in implied volatility would result in significantly higher (lower) 
determination of fair value measurement for the Company's aircraft fuel derivatives. As of December 31, 2017 and 2016, the 
Company had no outstanding jet fuel derivatives. 

Long-term Debt

The estimated fair value of the Company's non publicly held debt agreements has been determined to be Level 3 as 

certain inputs used to determine the fair value of these agreements are unobservable. The Company utilizes a discounted cash 
flow method to estimate the fair value of the Level 3 long-term debt. The estimated fair value of the Company's publicly held 
debt agreements has been determined to be Level 2 as the Company utilizes quoted market prices to estimate the fair value of 
it's public long-term debt.

The carrying amounts and estimated fair values of the Company's long-term debt at December 31, 2017 and 

December 31, 2016, were as follows:

As of December 31,

2017

2016

Carrying
Value

Estimated
Fair Value

Carrying
Value

Estimated
Fair Value

$

417.9

$

435.3

$

(in millions)

39.3

518.0

408.6

92.0

37.5

12.5

13.8

40.4

528.6

420.9

94.2

37.4

12.6

13.8

451.9
47.1
—
409.8
103.6

—

—

—

463.9

48.1

N/A

416.0

105.7

N/A

N/A

N/A

$

1,539.6

$

1,583.2

$

1,012.4

$

1,033.7

Fair value
level
hierarchy

Level 3

Level 3

Level 3

Level 2

Level 2

Level 2

Level 2

Level 2

Senior term loans

Junior term loans

Fixed-rate loans

2015-1 EETC Class A

2015-1 EETC Class B

2017-1 EETC Class AA

2017-1 EETC Class A

2017-1 EETC Class B

Total long-term debt

Cash and Cash Equivalents 

Cash and cash equivalents at December 31, 2017 and December 31, 2016 are comprised of liquid money market funds 

and cash and are categorized as Level 1 instruments. The Company maintains cash with various high-quality financial 
institutions. 

Short-term Investment Securities 

Short-term investment securities at December 31, 2017 and December 31, 2016 are comprised of available-for-sale asset-

backed securities with contractual maturities of twelve months or less and are categorized as Level 1 instruments, as the 
Company uses quoted market prices in active markets when determining the fair value of these securities. For additional 
information, refer to Note 6, Short-term Investment Securities. 

Assets and liabilities measured at gross fair value on a recurring basis are summarized below:

91

 
 
 
 
Notes to Financial Statements—(Continued)

Cash and cash equivalents

Short-term investment securities

Total assets

Total liabilities

Cash and cash equivalents

Short-term investment securities

Total assets

Total liabilities

Fair Value Measurements as of December 31, 2017

Total

Level
1

Level
2

Level
3

(in millions)

800.8

100.9

901.7

$

$

800.8

100.9

901.7

$

$

— $

—

— $

— $

— $

— $

Fair Value Measurements as of December 31, 2016

Total

Level
1

Level
2

Level
3

(in millions)

700.9

100.2

801.1

$

$

700.9

100.2

801.1

$

$

— $

—

— $

— $

— $

— $

—

—

—

—

—

—

—

—

$

$

$

$

$

$

The Company had no transfers of assets or liabilities between any of the above levels during the years ended 

December 31, 2017 or 2016. 

The Company's Valuation Group, which reports to the Chief Financial Officer, is made up of individuals from the 

Company's Treasury and Corporate Accounting departments. The Valuation Group is responsible for the execution of the 
Company's valuation policies and procedures. The Valuation Group compares the results of the Company's internally developed 
valuation methods with counterparty reports at each balance sheet date, assesses the Company's valuation methods for 
accurateness and identifies any needs for modification. 

18.  Operating Segments and Related Disclosures

The Company is managed as a single business unit that provides air transportation for passengers. Operating revenues by 

geographic region as defined by the Department of Transportation (DOT) area are summarized below:

DOT—Domestic
DOT—Latin America
Total

2017

$

$

2,435.9
211.8
2,647.7

2016
(in millions)
2,136.2
$
185.8
2,322.0

$

2015

$

$

1,940.2
201.3
2,141.5

During 2017, 2016 and 2015, no revenue from any one foreign country represented greater than 4% of the Company’s 

total passenger revenue. The Company attributes operating revenues by geographic region based upon the origin and 
destination of each passenger flight segment. The Company’s tangible assets consist primarily of flight equipment, which are 
mobile across geographic markets and, therefore, have not been allocated.

19.  Quarterly Financial Data (Unaudited)

Quarterly results of operations for the years ended December 31, 2017 and 2016 are summarized below:

92

 
 
 
 
 
2017

Operating revenue

Operating income

Net income (1)

Basic earnings per share (1)

Diluted earnings per share (1)

2016

Operating revenue

Operating income

Net income

Basic earnings per share

Diluted earnings per share

Three Months Ended

March 31

June 30

September 30

December 31

(in thousands, except per share amounts)

$

591,746

$

701,682

$

687,231

$

59,405

31,935

0.46

0.46

132,736

78,143

1.13

1.12

104,104

60,190

0.87

0.87

667,007

92,546

250,338

3.64

3.63

$

538,143

$

584,133

$

621,329

$

578,351

101,299

61,920

0.87

0.86

121,835

73,084

1.03

1.03

135,216

81,382

1.17

1.17

85,311

48,493

0.70

0.70

(1) During the fourth quarter of 2017, the Company recorded a non-recurring income tax benefit of $199.3 million 
($2.90 and $2.89 per basic and diluted share, respectively, for fourth quarter 2017) due to the enactment of the Tax 
Cuts and Jobs Act of 2017. For additional information, refer to Note 15, Income Taxes.

93

 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and the Board of Directors of Spirit Airlines, Inc.

Opinion on the Financial Statements
We have audited the accompanying balance sheets of Spirit Airlines, Inc. (the Company) as of December 31, 2017 and 2016, the 
related statements of operations, comprehensive income, shareholders' equity and cash flows for each of the three years in the 
period ended December 31, 2017, and the related notes (collectively referred to as the “financial statements”). In our opinion, the 
financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2017 and 2016, 
and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017, in conformity 
with U.S. generally accepted accounting principles. 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) 
(PCAOB), the Company’s internal control over financial reporting as of December 31, 2017, based on criteria established in 
Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission 
(2013 framework) and our report dated February 13, 2018 expressed an unqualified opinion thereon. 

Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on 
the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are 
required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable 
rules and regulations of the Securities and Exchange Commission and the PCAOB. 

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the 
audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error 
or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether 
due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, 
evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting 
principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial 
statements. We believe that our audits provide a reasonable basis for our opinion. 

We have served as the Company’s auditor since 1995.

Miami, Florida
February 13, 2018 

/s/ Ernst & Young LLP
Certified Public Accountants

94

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Shareholders and the Board of Directors of Spirit Airlines, Inc.

Opinion on Internal Control over Financial Reporting
We have audited Spirit Airlines, Inc.’s internal control over financial reporting as of December 31, 2017, based on criteria established 
in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission 
(2013 framework), (the COSO criteria). In our opinion, Spirit Airlines, Inc. (the Company) maintained, in all material respects, 
effective internal control over financial reporting as of December 31, 2017, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) 
(PCAOB),  the  balance  sheets  of  the  Company  as  of  December  31,  2017  and  2016,  the  related  statements  of  operations, 
comprehensive income, shareholders' equity and cash flows for each of the three years in the period ended December 31, 2017, 
and the related notes and our report dated February 13, 2018 expressed an unqualified opinion thereon.

Basis for Opinion
The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment 
of the effectiveness of internal control over financial reporting included in the accompanying Management's Annual Report on 
Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over 
financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent 
with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the 
Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the 
audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material 
respects.  Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a 
material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed 
risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides 
a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability 
of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted 
accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain 
to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets 
of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial 
statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are 
being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable 
assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that 
could have a material effect on the financial statements. 

Because  of  its  inherent  limitations,  internal  control  over  financial  reporting  may  not  prevent  or  detect  misstatements. Also, 
projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because 
of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Miami, Florida
February 13, 2018

/s/ Ernst & Young LLP
Certified Public Accountants

95

 
 
 
 
 
ITEM 9. 
FINANCIAL DISCLOSURE

CHANGES AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND 

None.

ITEM 9A. 

CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Management, with the participation of our Chief Executive Officer and our Chief Financial Officer, evaluated the 

effectiveness of our disclosure controls and procedures as of December 31, 2017. The term “disclosure controls and 
procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a 
company that are designed to ensure that information required to be disclosed by a company in the reports that it files or 
submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the 
SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to 
ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is 
accumulated and communicated to our management, including its principal executive and principal financial officers, as 
appropriate to allow timely decisions regarding required disclosure.

Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only 

reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-
benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of 
December 31, 2017, our Chief Executive Officer and Chief Financial Officer concluded that, as of such date, our disclosure 
controls and procedures were effective at the reasonable assurance level. 

Management's Annual Report on Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting, as such 
term is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934. Our internal control over financial 
reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of 
financial statements for external purposes in accordance with accounting principles generally accepted in the United States of 
America.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. 
Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate 
because of changes in conditions, or that the degree of compliance with the policies may deteriorate.

Management conducted an evaluation of the effectiveness of our internal control over financial reporting based on the 

2013 framework established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations 
of the Treadway Commission (the COSO Framework). Based on that evaluation, management believes that our internal control 
over financial reporting was effective as of December 31, 2017.

The effectiveness of our internal control over financial reporting as of December 31, 2017 has been audited by Ernst & 

Young LLP, an independent registered public accounting firm, which also audited our Financial Statements for the year ended 
December 31, 2017. Ernst & Young LLP's report on our internal control over financial reporting is included herein.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during 2017 that have materially affected, or are 

reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B. 

OTHER INFORMATION

  None.

96

PART III

ITEM 10. 

DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information under the captions, “Election of Directors,” “Corporate Governance,” “Committee and Meetings of the 
Board of Directors,” “Executive Officers,” “Code of Ethics” and “Section 16(a) Beneficial Ownership Reporting Compliance” 
in our 2018 Proxy Statement is incorporated herein by reference. 

ITEM 11. 

EXECUTIVE COMPENSATION

The information under the captions, “Director Compensation” and “Executive Compensation” in our 2018 Proxy 

Statement is incorporated herein by reference. 

ITEM 12. 
RELATED STOCKHOLDER MATTERS

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND 

The information under the captions, “Security Ownership” and “Equity Compensation Plan Information” in our 2018 

Proxy Statement is incorporated herein by reference. 

ITEM 13. 

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

The information under the captions, “Certain Relationships and Related Transactions” and “Corporate Governance” in 

our 2018 Proxy Statement is incorporated herein by reference. 

ITEM 14. 

PRINCIPAL ACCOUNTING FEES AND SERVICES

The information under the captions, “Ratification of Independent Registered Public Accounting Firm” in our 2018 Proxy 

Statement is incorporated herein by reference. 

With the exception of the information specifically incorporated by reference in Part III to this Annual Report on Form 10-

K from our 2018 Proxy Statement, our 2018 Proxy Statement shall not be deemed to be filed as part of this Report. 

97

ITEM 15. 

EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

PART IV

(a) 1.  Financial Statements:

The financial statements included in Item 8. Financial Statements and Supplementary Data above are filed as part of 

this annual report.

     2.  Financial Statement Schedules:

There are no financial statement schedules filed as part of this annual report, since the required information is included 

in the Financial Statements, including the notes thereto, or the circumstances requiring inclusion of such schedules are not 
present.

     3. Exhibits:

The exhibits filed as part of this Annual Report on Form 10-K are listed on the Exhibit Index included after the 

signature page.

98

 
 
 
Exhibit No.

   Description of Exhibit

EXHIBIT INDEX

3.1

3.2

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

4.10

4.11

Amended and Restated Certificate of Incorporation of Spirit Airlines, Inc., dated as of June 1, 2011, filed as 
Exhibit 3.1 to the Company's Current Report on Form 8-K dated June 1, 2011, is hereby incorporated by 
reference.

Amended and Restated Bylaws of Spirit Airlines, Inc., dated as of June 1, 2011, filed as Exhibit 3.2 to the 
Company's Current Report on Form 8-K dated June 1, 2011, is hereby incorporated by reference.

Specimen Common Stock Certificate, filed as Exhibit 4.1 to the Company's Form S-1 Registration 
Statement (No. 333-178336), is hereby incorporated by reference.

Pass Through Trust Agreement, dated as of August 11, 2015, between Spirit Airlines, Inc. and Wilmington 
Trust, National Association, filed as Exhibit 4.1 to the Company’s Form 8-K dated August 11, 2015, is 
hereby incorporated by reference.

Trust Supplement No. 2015-1A, dated as of August 11, 2015, between Spirit Airlines, Inc. and Wilmington 
Trust, National Association, as Trustee, to the Pass Through Trust Agreement, dated as of August 11, 2015, 
filed as Exhibit 4.2 to the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Trust Supplement No. 2015-1B, dated as of August 11, 2015, between Spirit Airlines, Inc. and Wilmington 
Trust, National Association, as Trustee, to the Pass Through Trust Agreement, dated as of August 11, 2015, 
filed as Exhibit 4.3 to the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Revolving Credit Agreement (2015-1A), dated as of August 11, 2015, between Wilmington Trust, National 
Association, as Subordination Agent (as agent and trustee for the trustee of Spirit Airlines Pass Through 
Trust 2015-1A), as Borrower, and Natixis, acting via its New York Branch, as Liquidity Provider, filed as 
Exhibit 4.4 to the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Revolving Credit Agreement (2015-1B), dated as of August 11, 2015, between Wilmington Trust, National 
Association, as Subordination Agent (as agent and trustee for the trustee of Spirit Airlines Pass Through 
Trust 2015-1B), as Borrower, and Natixis, acting via its New York Branch, as Liquidity Provider, filed as 
Exhibit 4.5 to the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Intercreditor Agreement (2015-1), dated as of August 11, 2015, among Wilmington Trust, National 
Association, as Trustee of the Spirit Airlines Pass Through Trust 2015-1A and as Trustee of the Spirit 
Airlines Pass Through Trust 2015-1B, Natixis, acting via its New York Branch, as Class A Liquidity 
Provider and Class B Liquidity Provider, and Wilmington Trust, National Association, as Subordination 
Agent, filed as Exhibit 4.6 to the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by 
reference.

Deposit Agreement (Class A), dated as of August 11, 2015, between Wilmington Trust Company, as Escrow 
Agent, and Natixis, acting via its New York Branch, as Depositary, filed as Exhibit 4.7 to the Company’s 
Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Deposit Agreement (Class B), dated as of August 11, 2015, between Wilmington Trust Company, as Escrow 
Agent, and Natixis, acting via its New York Branch, as Depositary, filed as Exhibit 4.8 to the Company’s 
Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Escrow and Paying Agent Agreement (Class A), dated as of August 11, 2015, among Wilmington Trust 
Company, as Escrow Agent, Citigroup Global Markets Inc., Morgan Stanley & Co. LLC and Credit Suisse 
Securities (USA) LLC, as Underwriters, Wilmington Trust, National Association, not in its individual 
capacity, but solely as Pass Through Trustee for and on behalf of Spirit Airlines Pass Through Trust 
2015-1A, and Wilmington Trust, National Association, as Paying Agent, filed as Exhibit 4.9 to the 
Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference. 

Escrow and Paying Agent Agreement (Class B), dated as of August 11, 2015, among Wilmington Trust 
Company, as Escrow Agent, Citigroup Global Markets Inc., Morgan Stanley & Co. LLC and Credit Suisse 
Securities (USA) LLC, as Underwriters, Wilmington Trust, National Association, not in its individual 
capacity, but solely as Pass Through Trustee for and on behalf of Spirit Airlines Pass Through Trust 
2015-1B, and Wilmington Trust, National Association, as Paying Agent, filed as Exhibit 4.10 to the 
Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference.

99

  
  
  
4.12

4.13

4.14

4.15

4.16

4.17

4.18

4.19

4.20

4.21

4.22

4.23

4.24

Note Purchase Agreement, dated as of August 11, 2015, among Spirit Airlines, Inc., Wilmington Trust, 
National Association, as Pass Through Trustee under each of the Pass Through Trust Agreements, 
Wilmington Trust, National Association, as Subordination Agent, Wilmington Trust Company, as Escrow 
Agent, and Wilmington Trust National Association, as Paying Agent, filed as Exhibit 4.11 to the Company’s 
Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Form of Participation Agreement (Participation Agreement among Spirit Airlines, Inc., Wilmington Trust, 
National Association, as Pass Through Trustee under each of the Pass Through Trust Agreements, 
Wilmington Trust, National Association, as Subordination Agent, Wilmington Trust, National Association, 
as Loan Trustee, and Wilmington Trust, National Association, in its individual capacity as set forth therein) 
(Exhibit B to Note Purchase Agreement), filed as Exhibit 4.12 to the Company’s Form 8-K dated August 
11, 2015, is hereby incorporated by reference.

Form of Indenture and Security Agreement (Indenture and Security Agreement between Spirit Airlines, Inc. 
and Wilmington Trust, National Association, as Loan Trustee) (Exhibit C to Note Purchase Agreement), 
filed as Exhibit 4.13 to the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by 
reference.

Form of Pass Through Trust Certificate, Series 2015-1A (included in Exhibit A to Exhibit 4.2), filed as 
Exhibit 4.14 to the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Form of Pass Through Trust Certificate, Series 2015-1B (included in Exhibit A to Exhibit 4.3), filed as 
Exhibit 4.15 to the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Form of Series 2015-1 Equipment Notes (included in Section 2.01 of Exhibit 4.13), filed as Exhibit 4.16 to 
the Company’s Form 8-K dated August 11, 2015, is hereby incorporated by reference.

Trust Supplement No. 2017-1AA, dated as of November  28, 2017, between Spirit Airlines, Inc. and 
Wilmington Trust, National Association, as Trustee, to the Pass Through Trust Agreement, dated as of 
August 11, 2015, filed as Exhibit 4.2 to the Company’s Form 8-K dated November 28, 2017, is hereby 
incorporated by reference.  

Trust Supplement No. 2017-1A, dated as of November  28, 2017, between Spirit Airlines, Inc. and 
Wilmington Trust, National Association, as Trustee, to the Pass Through Trust Agreement, dated as of 
August 11, 2015, filed as Exhibit 4.3 to the Company’s Form 8-K dated November 28, 2017, is hereby 
incorporated by reference.

Trust Supplement No. 2017-1B, dated as of November  28, 2017, between Spirit Airlines, Inc. and 
Wilmington Trust, National Association, as Trustee, to the Pass Through Trust Agreement, dated as of 
August 11, 2015, filed as Exhibit 4.4 to the Company’s Form 8-K dated November 28, 2017, is hereby 
incorporated by reference.

Revolving Credit Agreement (2017-1AA), dated as of November  28, 2017, between Wilmington Trust, 
National Association, as Subordination Agent (as agent and trustee for the trustee of Spirit Airlines Pass 
Through Trust 2017-1AA), as Borrower, and Commonwealth Bank of Australia, New York Branch, as 
Liquidity Provider, filed as Exhibit 4.5 to the Company’s Form 8-K dated November 28, 2017, is hereby 
incorporated by reference.  

Revolving Credit Agreement (2017-1A), dated as of November  28, 2017, between Wilmington Trust, 
National Association, as Subordination Agent (as agent and trustee for the trustee of Spirit Airlines Pass 
Through Trust 2017-1A), as Borrower, and Commonwealth Bank of Australia, New York Branch, as 
Liquidity Provider, filed as Exhibit 4.6 to the Company’s Form 8-K dated November 28, 2017, is hereby 
incorporated by reference.

Revolving Credit Agreement (2017-1B), dated as of November  28, 2017, between Wilmington Trust, 
National Association, as Subordination Agent (as agent and trustee for the trustee of Spirit Airlines Pass 
Through Trust 2017-1B), as Borrower, and Commonwealth Bank of Australia, New York Branch, as 
Liquidity Provider, filed as Exhibit 4.7 to the Company’s Form 8-K dated November 28, 2017, is hereby 
incorporated by reference.

Intercreditor Agreement (2017-1), dated as of November  28, 2017, among Wilmington Trust, National 
Association, as Trustee of the Spirit Airlines Pass Through Trust 2017-1AA, as Trustee of the Spirit Airlines 
Pass Through Trust 2017-1A  and as Trustee of the Spirit Airlines Pass Through Trust 2017-1B, 
Commonwealth Bank of Australia, New York Branch, as Class AA Liquidity Provider, Class A Liquidity 
Provider and Class B Liquidity Provider, and Wilmington Trust, National Association, as Subordination 
Agent, filed as Exhibit 4.8 to the Company’s Form 8-K dated November 28, 2017, is hereby incorporated 
by reference.

100

4.25

4.26

4.27

4.28

4.29

4.30

4.31

4.32

4.33

4.34

4.35

4.36

4.37

10.1+

10.2+

Deposit Agreement (Class AA), dated as of November 28, 2017, between Wilmington Trust Company, as 
Escrow Agent, and Citibank, N.A., as Depositary, filed as Exhibit 4.9 to the Company’s Form 8-K dated 
November 28, 2017, is hereby incorporated by reference.

Deposit Agreement (Class A), dated as of November 28, 2017, between Wilmington Trust Company, as 
Escrow Agent, and Citibank, N.A., as Depositary, filed as Exhibit 4.10 to the Company’s Form 8-K dated 
November 28, 2017, is hereby incorporated by reference.

Deposit Agreement (Class B), dated as of November 28, 2017, between Wilmington Trust Company, as 
Escrow Agent, and Citibank, N.A., as Depositary, filed as Exhibit 4.11 to the Company’s Form 8-K dated 
November 28, 2017, is hereby incorporated by reference.

Escrow and Paying Agent Agreement (Class AA), dated as of November 28, 2017, among Wilmington 
Trust Company, as Escrow Agent, Morgan Stanley  & Co. LLC, Citigroup Global Markets Inc., Goldman 
Sachs  & Co. LLC and Barclays Capital Inc., as Underwriters, Wilmington Trust, National Association, not 
in its individual capacity, but solely as Pass Through Trustee for and on behalf of Spirit Airlines Pass 
Through Trust 2017-1AA, and Wilmington Trust, National Association, as Paying Agent, filed as Exhibit 
4.12 to the Company’s Form 8-K dated November 28, 2017, is hereby incorporated by reference.

Escrow and Paying Agent Agreement (Class A), dated as of November 28, 2017, among Wilmington Trust 
Company, as Escrow Agent, Morgan Stanley  & Co. LLC, Citigroup Global Markets Inc., Goldman Sachs  
& Co. LLC and Barclays Capital Inc., as Underwriters, Wilmington Trust, National Association, not in its 
individual capacity, but solely as Pass Through Trustee for and on behalf of Spirit Airlines Pass Through 
Trust 2017-1A, and Wilmington Trust, National Association, as Paying Agent, filed as Exhibit 4.13 to the 
Company’s Form 8-K dated November 28, 2017, is hereby incorporated by reference.

Escrow and Paying Agent Agreement (Class B), dated as of November 28, 2017, among Wilmington Trust 
Company, as Escrow Agent, Morgan Stanley  & Co. LLC, Citigroup Global Markets Inc., Goldman Sachs  
& Co. LLC and Barclays Capital Inc., as Underwriters, Wilmington Trust, National Association, not in its 
individual capacity, but solely as Pass Through Trustee for and on behalf of Spirit Airlines Pass Through 
Trust 2017-1B, and Wilmington Trust, National Association, as Paying Agent, filed as Exhibit 4.14 to the 
Company’s Form 8-K dated November 28, 2017, is hereby incorporated by reference.

Note Purchase Agreement, dated as of November 28, 2017, among Spirit Airlines, Inc., Wilmington Trust, 
National Association, as Pass Through Trustee under each of the Pass Through Trust Agreements, 
Wilmington Trust, National Association, as Subordination Agent, Wilmington Trust Company, as Escrow 
Agent, and Wilmington Trust National Association, as Paying Agent, filed as Exhibit 4.15 to the Company’s 
Form 8-K dated November 28, 2017, is hereby incorporated by reference.  

Form of Participation Agreement (Participation Agreement among Spirit Airlines, Inc., Wilmington Trust, 
National Association, as Pass Through Trustee under each of the Pass Through Trust Agreements, 
Wilmington Trust, National Association, as Subordination Agent, Wilmington Trust, National Association, 
as Loan Trustee, and Wilmington Trust, National Association, in its individual capacity as set forth therein) 
(Exhibit B to Note Purchase Agreement), filed as Exhibit 4.16 to the Company’s Form 8-K dated November 
28, 2017, is hereby incorporated by reference.  

Form of Indenture and Security Agreement (Indenture and Security Agreement between Spirit Airlines, Inc. 
and Wilmington Trust, National Association, as Loan Trustee) (Exhibit C to Note Purchase Agreement), 
filed as Exhibit 4.17 to the Company’s Form 8-K dated November 28, 2017, is hereby incorporated by 
reference.  

Form of Pass Through Trust Certificate, Series 2017-1AA (included in Exhibit A to Exhibit 4.2), filed as 
Exhibit 4.18 to the Company’s Form 8-K dated November 28, 2017, is hereby incorporated by reference.

Form of Pass Through Trust Certificate, Series 2017-1A (included in Exhibit A to Exhibit 4.3), filed as 
Exhibit 4.19 to the Company’s Form 8-K dated November 28, 2017, is hereby incorporated by reference.

Form of Pass Through Trust Certificate, Series 2017-1B (included in Exhibit A to Exhibit 4.4), filed as 
Exhibit 4.20 to the Company’s Form 8-K dated November 28, 2017, is hereby incorporated by reference.

Form of Series 2017-1 Equipment Notes(included in Section 2.01 of Exhibit 4.17), filed as Exhibit 4.21 to 
the Company’s Form 8-K dated November 28, 2017, is hereby incorporated by reference.

General Release, dated January 14, 2014, between Spirit Airlines, Inc. and Ben Baldanza, filed as Exhibit 
10.1 to the Company's Form 10-K dated February 20, 2014, is hereby incorporated by reference.

Amended and Restated Employment Agreement, dated as of January 8, 2014, between Spirit Airlines, Inc. 
and Ben Baldanza, filed as Exhibit 10.2 to the Company's Form 10-K dated February 20, 2014, is hereby 
incorporated by reference. 

101

  
  
10.3+

10.4†

10.5†

10.6†

10.7†

10.8†

10.9†

10.10†

10.11†

10.12

10.13†

10.14†

10.15†

10.16

Offer Letter, dated September 7, 2013, between Spirit Airlines, Inc. and John Bendoraitis, filed as Exhibit 
10.3 to the Company's Form 10-K dated February 20, 2014, is hereby incorporated by reference. 

Amended and Restated V2500 General Terms of Sale, dated as of October 1, 2013, by and between Spirit 
Airlines, Inc. and IAE International Aero Engines AG, as supplemented by Side Letter No. 1 dated as of 
October 1, 2013, filed as Exhibit 10.1 to the Company's Form 10-Q/A dated February 20, 2014, is hereby 
incorporated by reference. 

Amended and Restated Fleet Hour Agreement, dated as of October 1, 2013, by and between Spirit Airlines, 
Inc. and IAE International Aero Engines AG, as supplemented by Side Letter No. 1 dated as of October 1, 
2013, filed as Exhibit 10.2 to the Company's Form 10-Q/A dated February 20, 2014, is hereby incorporated 
by reference.

V2500 General Terms of Sale, dated as of October 1, 2013, by and between Spirit Airlines, Inc. and IAE 
International Aero Engines AG, as supplemented by Side Letter No. 1 dated as of October 1, 2013 and Side 
Letter No. 2 dated as of October 1, 2013, filed as Exhibit 10.3 to the Company's Form 10-Q/A dated 
February 20, 2014, is hereby incorporated by reference.

Fleet Hour Agreement, dated of as October 1, 2013, by and between Spirit Airlines, Inc. and IAE 
International Aero Engines AG, as supplemented by Side Letter No. 1 dated as of October 1, 2013, filed as 
Exhibit 10.4 to the Company's Form 10-Q/A dated February 20, 2014, is hereby incorporated by reference.

PurePower PW1100G Engine Purchase Support Agreement, dated as of October 1, 2013, by and between 
the Company and United Technologies Corporation, acting through its Pratt & Whitney Division, filed as 
Exhibit 10.5 to the Company's Form 10-Q dated October 30, 2013, is hereby incorporated by reference.

Hosted Services Agreement, dated as of February 28, 2007, between Spirit Airlines, Inc. and Navitaire Inc., 
as amended by Amendment No. 1 dated as of October 23, 2007, Amendment No. 2 dated as of May 15, 
2008, Amendment No. 3 dated as of November 21, 2008, Amendment No. 4 dated as of August 17, 2009 
and Amendment No. 5 dated November 4, 2009, filed as Exhibit 10.3 to the Company's Amendment No. 4 
to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.

Signatory Agreement, dated as of May 21, 2009, between Spirit Airlines, Inc. and U.S. Bank National 
Association, as amended by First Amendment dated January 18, 2010, filed as Exhibit 10.4 to the 
Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby 
incorporated by reference.

Terms and Conditions for Worldwide Acceptance of the American Express Card by Airlines, dated 
September 4, 1998, between Spirit Airlines, Inc. and American Express Travel Related Services Company, 
Inc., as amended January 1, 2003 and August 28, 2003, filed as Exhibit 10.6 to the Company's Amendment 
No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.

Tax Receivable Agreement, dated as of June 1, 2011 between Spirit Airlines, Inc., Indigo Pacific Partners 
LLC, and OCM FIE, LLC, filed as Exhibit 10.12 to the Company's Form S-1 Registration Statement (No. 
333-178336), is hereby incorporated by reference.

Lease, dated as of June 17, 1999, between Sunbeam Development Corporation and Spirit Airlines, Inc., as 
amended by Lease Modification and Contraction Agreement dated as of May 7, 2009, filed as Exhibit 10.13 
to the Company's Amendment No. 4 to Form S-1 Registration Statement (No. 333-169474), is hereby 
incorporated by reference.

Lease Modification and Extension Agreement, dated as of September 26th, 2013, between Sunbeam 
Development Corporation and Spirit Airlines, Inc., filed as Exhibit 10.14 to the Company's Form 10-K 
dated February 20, 2014, is hereby incorporated by reference.

Lease, dated as of September 26th, 2013, between Sunbeam Development Corporation and Spirit Airlines, 
Inc., filed as Exhibit 10.15 to the Company's Form 10-K dated February 20, 2014, is hereby incorporated by 
reference.

Airline-Airport Lease and Use Agreement, dated as of August 17, 1999, between Broward County and 
Spirit Airlines, Inc., as supplemented by Addendum dated August 17, 1999, filed as Exhibit 10.14 to the 
Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby 
incorporated by reference.

102

  
  
  
  
  
  
  
  
Airbus A320 Family Purchase Agreement, dated as of May 5, 2004, between AVSA, S.A.R.L. and Spirit 
Airlines, Inc.; as amended by Amendment No. 1 dated as of December 21, 2004, Amendment No. 2 dated 
as of April 15, 2005, Amendment No. 3 dated as of June 30, 2005, Amendment No. 4 dated as of October 
27, 2006 (as amended by Letter Agreement No. 1, dated as of October 27, 2006, to Amendment No. 4 and 
Letter Agreement No. 2, dated as of October 27, 2006, to Amendment No. 4), Amendment No. 5 dated as of 
March 5, 2007, Amendment No. 6 dated as of March 27, 2007, Amendment No. 7 dated as of June 26, 2007 
(as amended by Letter Agreement No. 1, dated as of June 26, 2007, to Amendment No. 7), Amendment No. 
8 dated as of February 4, 2008, Amendment No. 9 dated as of June 24, 2008 (as amended by Letter 
Agreement No. 1, dated as of June 24, 2008, to Amendment No. 9) and Amendment No. 10 dated July 17, 
2009 (as amended by Letter Agreement No. 1, dated as of July 17, 2009, to Amendment No. 10), and as 
supplemented by Letter Agreement No. 1 dated as of May 5, 2004, Letter Agreement No. 2 dated as of May 
5, 2004, Letter Agreement No. 3 dated as of May 5, 2004, Letter Agreement No. 4 dated as of May 5, 2004, 
Letter Agreement No. 5 dated as of May 5, 2004, Letter Agreement No. 6 dated as of May 5, 2004, Letter 
Agreement No. 7 dated as of May 5, 2004, Letter Agreement No. 8 dated as of May 5, 2004, Letter 
Agreement No. 9 dated as of May 5, 2004, Letter Agreement No. 10 dated as of May 5, 2004 and Letter 
Agreement No. 11 dated as of May 5, 2004, all filed as Exhibit 10.15 to the Company's Amendment No. 4 
to Form S-1 Registration Statement (No. 333-169474); as further amended by Amendment No. 11 dated as 
of December 29, 2011 (as amended by Letter Agreement No. 1 dated as of December 29, 2011, Letter 
Agreement No. 2 dated as of December 29, 2011, Letter Agreement No. 3 dated as of December 29, 2011, 
Letter Agreement No. 4 dated as of December 29, 2011, Letter Agreement No. 5 dated as of December 29, 
2011, Letter Agreement No. 6 dated as of December 29, 2011, Letter Agreement No. 7 dated as of 
December 29, 2011 and Letter Agreement No. 8 dated as of December 29, 2011) all filed as Exhibit 10.1 to 
the Company's Form 8-K dated January 5, 2012; Amendment No. 12, dated as of June 29, 2012, filed as 
Exhibit 10.1 to the Company's Form 10-Q dated July 26, 2013; Amendment No. 13, dated as of January 10, 
2013, filed as Exhibit 10.2 to the Company's Form 10-Q dated July 26, 2013; and Amendment No. 14, 
dated as of June 20, 2013, filed as Exhibit 10.3 to the Company's Form 10-Q dated July 26, 2013; and 
Amendment No. 15 dated as of November 21, 2013, filed as Exhibit 10.1 to the Company's Form 10-Q 
dated July 29, 2016; Amendment No. 16 dated as of December 17, 2013, filed as Exhibit 10.2 to the 
Company's Form 10-Q dated July 29, 2016; Amendment No. 17 dated as of March 11, 2014, filed as 
Exhibit 10.3 to the Company's Form 10-Q dated July 29, 2016; Amendment No. 18 dated as of July 31, 
2014, filed as Exhibit 10.4 to the Company's Form 10-Q dated July 29, 2016; Amendment No. 19 dated as 
of August 21, 2015, filed as Exhibit 10.5 to the Company's Form 10-Q dated July 29, 2016; and 
Amendment No. 20 dated as of April 27, 2016, filed as Exhibit 10.6 to the Company's Form 10-Q dated 
July 29, 2016 is hereby incorporated by reference.

Spirit Airlines, Inc. Executive Severance Plan, filed as Exhibit 10.16 to the Company's Amendment No. 3 to 
Form S-1 Registration Statement (No. 333-169474), is hereby incorporated by reference.

Amended and Restated Spirit Airlines, Inc. 2005 Stock Incentive Plan and related documents, filed as 
Exhibit 10.17 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), 
is hereby incorporated by reference.

Spirit Airlines, Inc. 2011 Equity Incentive Award Plan, filed as Exhibit 10.2 to the Company's Form S-8 
Registration Statement (No. 333-174812), is hereby incorporated by reference.

Offer Letter, dated September 10, 2007, between Spirit Airlines, Inc. and Thomas Canfield, filed as Exhibit 
10.22 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 333-169474), is hereby 
incorporated by reference.

Form of Indemnification Agreement between Spirit Airlines, Inc. and its directors and executive officers, 
filed as Exhibit 10.24 to the Company's Amendment No. 3 to Form S-1 Registration Statement (No. 
333-169474), is hereby incorporated by reference.

Form of Restricted Stock Unit Award Grant Notice and Restricted Stock Unit Award Agreement under the 
Spirit Airlines, Inc. 2011 Equity Incentive Award Plan, filed as Exhibit 10.4 to the Company's Form S-8 
Registration Statement (No. 333-174812), is hereby incorporated by reference.

Addendum and Amendment to the Agreement Governing Acceptance of the American Express Card by 
Airlines, dated as of June 24, 2011, by and between Spirit Airlines, Inc. and American Express Travel 
Related Services Company, Inc., filed as Exhibit 10.1 to the Company's Form 10-Q dated July 28, 2011, is 
hereby incorporated by reference.

Second Amendment to Signatory Agreement, effective as of September 6, 2011, by and between the 
Company and U.S. Bank, National Association, filed as Exhibit 10.1 to the Company's Form 10-Q/A dated 
December 22, 2011, is hereby incorporated by reference.

Letter Agreement, effective April 16, 2012, by and between Spirit Airlines, Inc. and Edward M. Christie, 
III, filed as Exhibit 10.2 to the Company's Form 10-Q dated May 1, 2012, is hereby incorporated by 
reference.

103

10.17†

10.18+

10.19+

10.20+

10.21+

10.22

10.23+

10.24†

10.25†

10.26+

  
10.27+

10.28+

10.29

10.30

10.31

10.32

10.33

10.34

10.35

10.36

10.37

10.38

10.39

10.40

10.41

10.42

12.1

23.1

31.1

31.2

32.1*

Letter Agreement, dated January 16, 2012, by and between Spirit Airlines, Inc. and Jim Lynde, filed as 
Exhibit 10.27 to the Company's Form 10-K dated February 20, 2014, is hereby incorporated by reference.

Separation and Transition Agreement with Tony Lefebvre, dated April 29, 2013, filed as Exhibit 10.4 to the 
Company's Form 10-Q dated July 26, 2013, is hereby incorporated by reference.

Framework Agreement, dated as of October 1, 2014 by and between Spirit Airlines, Inc., BNP Paribas, New 
York Branch, Landesbank Hessen-Thuringen Girozentrale, Natixis, New York Branch, KfW IPEX-Bank 
GmbH, Investec Bank PLC and Wilmington Trust Company, filed as Exhibit 10.1 to the Company's Form 
10-Q dated October 28, 2014, is hereby incorporated by reference.

Form of Performance Share Award Grant Notice and Performance Share Award Agreement for awards 
under the Spirit Airlines, Inc. 2015 Incentive Award Plan, filed as Exhibit 10.2 to the Company’s Form 10-
Q dated July 24, 2015, is hereby incorporated by reference.

Form of Restricted Stock Unit Award Grant Notice and Restricted Stock Unit Award Agreement for awards 
under the Spirit Airlines, Inc. 2015 Incentive Award Plan, filed as Exhibit 10.3 to the Company’s Form 10-
Q dated July 24, 2015, is hereby incorporated by reference.

Form of Annual Cash Award Grant Notice and Annual Cash Award Agreement for awards under the Spirit 
Airlines, Inc. 2015 Incentive Award Plan, filed as Exhibit 10.4 to the Company’s Form 10-Q dated July 24, 
2015, is hereby incorporated by reference.

Non-Employee Director Form of Restricted Stock Unit Award Grant Notice and Restricted Stock Unit 
Award Agreement for awards under the Spirit Airlines, Inc. 2015 Incentive Award Plan, filed as Exhibit 
10.5 to the Company’s Form 10-Q dated July 24, 2015, is hereby incorporated by reference.

Form of Restricted Stock Award Grant Notice and Restricted Stock Award Agreement for awards under the 
Spirit Airlines, Inc. 2011 Equity Incentive Award Plan, filed as Exhibit 10.6 to the Company’s Form 10-Q 
dated July 24, 2015, is hereby incorporated by reference.

Robert L. Fornaro Employment Agreement, filed as Exhibit 10.35 to the Company's Form 10-K dated 
February 17, 2016, is hereby incorporated by reference.

B. Ben Baldanza Separation Agreement, filed as Exhibit 10.36 to the Company's Form 10-K dated February 
17, 2016, is hereby incorporated by reference.

B. Ben Baldanza General Release, filed as Exhibit 10.37 to the Company's Form 10-K dated February 17, 
2016, is hereby incorporated by reference.

Theodore Botimer Severance and Release Agreement, filed as Exhibit 10.1 to the Company's Form 10-Q 
dated October 25, 2016, is hereby incorporated by reference.

Framework Agreement, dated as of March 29, 2017, by and between Spirit Airlines, Inc., BNP Paribas, 
certain financial institutions named therein, and Wilmington Trust Company, filed as Exhibit 10.1 to the 
Company's Form 10-Q dated April 28, 2017, is hereby incorporated by reference. 

Spirit Airlines, Inc. 2017 Executive Severance Plan, filed as Exhibit 10.1 to the Company's Form 8-K dated 
August 22, 2017, is hereby incorporated by reference.

Form of Performance Award Grant Notice and Performance Award Agreement under the Spirit Airlines, 
Inc. 2015 Equity Incentive Award Plan.

Form of Severance and Release Agreement. 

Computation of Ratio of Earnings to Fixed Charges.

Consent of Ernst & Young LLP, independent registered public accounting firm.

Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

Certifications pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-
Oxley Act of 2002.

104

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†

+

 *

Confidential treatment granted for certain portions of this Exhibit pursuant to Rule 406 under the Securities Act or Rule
24b-2 under the Exchange Act, which portions are omitted and filed separately with the Securities and Exchange
Commission.

Indicates a management contract or compensatory plan or arrangement.
Exhibits 32.1 is being furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Exchange Act,
or otherwise subject to the liability of that section, nor shall such exhibits be deemed to be incorporated by reference in
any registration statement or other document filed under the Securities Act or the Exchange Act, except as otherwise
specifically stated in such filing.

105

Pursuant to the requirements of Section 13 or Section 15(d) of the Securities Exchange Act of 1934, the registrant has 

duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

Date: February 13, 2018

SPIRIT AIRLINES, INC.
By:

/s/ Edward M. Christie

Edward M. Christie

President and Chief Financial Officer

106

 
 
POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and 
appoints Robert Fornaro, Edward Christie and Thomas Canfield, and each of them, their true and lawful attorneys-in-fact, each 
with full power of substitution, for them in any and all capacities, to sign any amendments to this report on Form 10-K and to 
file the same, with exhibits thereto and other documents in connection therewith, with the Securities and Exchange 
Commission, hereby ratifying and confirming all that each of said attorneys-in-fact or their substitute or substitutes may do or 
cause to be done by virtue hereof. 

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed by the following persons 

on behalf of the registrant in the capacities and on the dates indicated

Signature

Title

Date

Chief Executive Officer and Director (Principal
Executive Officer)

February 13, 2018

President, Chief Financial Officer and Director (Principal
Financial Officer)

February 13, 2018

Vice President, Controller (Principal Accounting Officer)

February 13, 2018

Director (Chairman of the Board)

February 13, 2018

February 13, 2018

February 13, 2018

February 13, 2018

February 13, 2018

February 13, 2018

February 13, 2018

/s/ Robert L. Fornaro
Robert L. Fornaro

/s/ Edward M. Christie
Edward M. Christie

/s/ Brian J. McMenamy
Brian J. McMenamy

/s/ H. McIntyre Gardner
H. McIntyre Gardner

/s/ Carlton D. Donaway
Carlton D. Donaway

/s/ David G. Elkins
David G. Elkins

/s/ Robert D. Johnson
Robert D. Johnson

/s/ Barclay G. Jones
Barclay G. Jones

Director

Director

Director

Director

/s/ Myrna M. Soto

Director

Myrna M. Soto

/s/ Dawn M. Zier

Director

Dawn M. Zier

107