10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

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

For the fiscal year ended December 31, 2015

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. 1-7259

Southwest Airlines Co.

(Exact name of registrant as specified in its charter)

TEXAS	74-1563240
(State or other jurisdiction of	(IRS Employer
incorporation or organization)	Identification No.)
P.O. Box 36611
Dallas, Texas	75235-1611
(Address of principal executive offices)	(Zip Code)

Registrant's telephone number, including area code:  (214) 792-4000

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

Title of Each Class	Name of Each Exchange on Which Registered
Common Stock ($1.00 par value)	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  þ    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  þ

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  þ    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  þ    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.    þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer þ Accelerated filer ¨ Non-accelerated filer ¨ Smaller reporting company ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  þ

The aggregate market value of the common stock held by non-affiliates of the registrant was approximately $21,774,060,585 computed by reference to the closing sale price of the common stock on the New York Stock Exchange on June 30, 2015, the last trading day of the registrant’s most recently completed second fiscal quarter.

Number of shares of common stock outstanding as of the close of business on January 29, 2016: 638,070,032 shares

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Definitive Proxy Statement for the Company’s Annual Meeting of Shareholders to be held May 18, 2016, are incorporated into Part III of this Annual Report on Form 10-K.

TABLE OF CONTENTS

	PART I
Item 1.	Business	4
Item 1A.	Risk Factors	20
Item 1B.	Unresolved Staff Comments	28
Item 2.	Properties	28
Item 3.	Legal Proceedings	30
Item 4.	Mine Safety Disclosures	31
	PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities	33
Item 6.	Selected Financial Data	35
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	37
	Liquidity and Capital Resources	52
	Off-Balance Sheet Arrangements, Contractual Obligations, and Contingent Liabilities and Commitments	53
	Critical Accounting Policies and Estimates	56
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	63
Item 8.	Financial Statements and Supplementary Data	67
	Southwest Airlines Co. Consolidated Balance Sheet	67
	Southwest Airlines Co. Consolidated Statement of Income	68
	Southwest Airlines Co. Consolidated Statement of Comprehensive Income	69
	Southwest Airlines Co. Consolidated Statement of Stockholders’ Equity	70
	Southwest Airlines Co. Consolidated Statement of Cash Flows	71
	Notes to Consolidated Financial Statements	72
Item 9.	Changes in and Disagreements With Accountants on Accounting and Financial Disclosure	111
Item 9A.	Controls and Procedures	111
Item 9B.	Other Information	112
	PART III
Item 10.	Directors, Executive Officers, and Corporate Governance	112
Item 11.	Executive Compensation	112
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	112
Item 13.	Certain Relationships and Related Transactions, and Director Independence	113
Item 14.	Principal Accounting Fees and Services	113
	PART IV
Item 15.	Exhibits and Financial Statement Schedules	114
Signatures		119

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PART I

Item 1. Business

Company Overview

Southwest Airlines Co. (the “Company” or “Southwest”) operates Southwest Airlines, a major passenger airline that provides scheduled air transportation in the United States and near-international markets. For the 43rd consecutive year, the Company was profitable, earning $2.2 billion in net income.

Southwest commenced service on June 18, 1971, with three Boeing 737 aircraft serving three Texas cities: Dallas, Houston, and San Antonio. The Company ended 2015 serving 97 destinations in 40 states, the District of Columbia, the Commonwealth of Puerto Rico, and seven near-international countries including Mexico, Jamaica, The Bahamas, Aruba, Dominican Republic, Costa Rica, and Belize. During 2015, the Company added its first three destinations in Central America (San Jose, Costa Rica, Belize City, Belize, and Liberia, Costa Rica) and also commenced Southwest service to a fourth destination in Mexico (Puerto Vallarta). At December 31, 2015, Southwest operated a total of 704 Boeing 737 aircraft.

During 2015, the Company also added 20 domestic nonstop destinations from Dallas Love Field. These routes were made possible by the repeal of certain federal flight restrictions at Dallas Love Field in October 2014. At year-end 2015, Southwest offered a total of 180 weekday departures to 50 nonstop destinations from Dallas Love Field. In addition, the Company added eight international nonstop destinations from a newly constructed five-gate international terminal at Houston’s William P. Hobby Airport. Based on the most recent data available from the U.S. Department of Transportation, as of June 30, 2015, Southwest was the largest domestic air carrier in the United States, as measured by the number of domestic originating passengers boarded.

Industry

The airline industry has historically been an extremely volatile industry subject to numerous challenges. Among other things, it has been cyclical, energy intensive, labor intensive, capital intensive, technology intensive, highly regulated, heavily taxed, and extremely competitive. The airline industry has also been particularly susceptible to detrimental events such as acts of terrorism, poor weather, and natural disasters.

The U.S. airline industry benefited from moderate economic growth during 2015 and was further aided by a significant drop in fuel prices. The U.S. airline industry, including Southwest, has increased available seat miles (also referred to as “capacity,” an available seat mile is one seat, empty or full, flown one mile and is a measure of space available to carry passengers in a given period), and has increased the number of seats per trip (or “gauge”) through slimline seat retrofits and the use of larger aircraft.

Company Operations

Route Structure

General

Southwest principally provides point-to-point service, rather than the “hub-and-spoke” service provided by most major U.S. airlines. The hub-and-spoke system concentrates most of an airline’s operations at a limited number of central hub cities and serves most other destinations in the system by providing one-stop or connecting service through a hub. By not concentrating operations through one or more central transfer points, Southwest’s point-to-point route structure has allowed for more direct nonstop routing than hub-and-spoke service. Approximately 74 percent of the Company's Customers flew nonstop during 2015, and, as of December 31, 2015, Southwest served 637 nonstop city pairs.

Southwest’s point-to-point service has also enabled it to provide its markets with frequent, conveniently timed flights and low fares. For example, Southwest currently offers 20 weekday roundtrips from Dallas Love Field to Houston Hobby, 14 weekday roundtrips from Los Angeles International to Oakland, 12 weekday roundtrips from Burbank to Oakland, 11 weekday roundtrips from Phoenix to Las Vegas, and ten weekday roundtrips from San Diego to San Jose.

Southwest complements its high-frequency short-haul routes with long-haul nonstop service between markets such as Los Angeles and Nashville, Las Vegas and Orlando, San Diego and Baltimore, and Houston and New York LaGuardia.

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During 2015, the Company continued to incorporate the Boeing 737-800 into its fleet, which offers significantly more Customer seating capacity than Southwest’s other aircraft. This has enabled the Company to more economically serve long-haul routes, as well as high-demand, slot-controlled and gate-restricted airports, by adding seats for such routes without increasing the number of flights (a “slot” is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration (“FAA”), to operate a takeoff or landing at a specific time at certain airports). For 2015, the Company’s average aircraft trip stage length was 750 miles, with an average duration of approximately 2.0 hours, as compared with an average aircraft trip stage length of 721 miles and an average duration of approximately 2.0 hours in 2014. During 2014, the Company also operated AirTran Airways (“AirTran”). AirTran’s final passenger service occurred on December 28, 2014, and it has been integrated into Southwest.

International Service

Southwest Airlines launched international service in 2014, and ended 2015 with service to 11 international destinations. The Company’s international expansion in 2015 was facilitated by the completion of construction of a new five-gate international terminal at Houston’s William P. Hobby Airport. The new terminal includes an expanded security checkpoint and an upgraded Southwest ticketing area. The Company controlled this expansion and the related financial terms pursuant to an Airport Use and Lease Agreement with the City of Houston. Additional information regarding this project is provided below under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 4 to the Consolidated Financial Statements.

Approximately $287 million of the Company’s 2015 operating revenues were attributable to foreign operations. The remainder of the Company’s 2015 operating revenues, approximately $19.5 billion, was attributable to domestic operations. Approximately $226 million of the Company’s 2014 operating revenues were attributable to foreign operations (including those attributable to both Southwest and AirTran). The remainder of the Company’s 2014 operating revenues, approximately $18.4 billion, was attributable to domestic operations. The Company's assets are not allocated to a geographic area because the Company’s tangible assets primarily consist of flight equipment, the majority of which are interchangeable and are deployed systemwide, with no individual aircraft dedicated to any specific route or region.

Cost Structure

General

A key component of the Company’s business strategy has historically been its low-cost structure, which was designed to allow it to profitably charge low fares. Adjusted for stage length, the Company has lower unit costs, on average, than the majority of major domestic carriers. The Company’s low-cost structure has historically been facilitated by Southwest’s use of a single aircraft type, the Boeing 737, its operationally efficient point-to-point route structure, and its highly productive Employees. Southwest’s use of a single aircraft type has allowed for simplified scheduling, maintenance, flight operations, and training activities. Southwest’s point-to-point route structure includes service to and from many secondary or downtown airports such as Dallas Love Field, Houston Hobby, Chicago Midway, Baltimore-Washington International, Burbank, Manchester, Oakland, San Jose, Providence, and Ft. Lauderdale-Hollywood. These conveniently located airports are typically less congested than other airlines’ hub airports, which has contributed to Southwest's ability to achieve high asset utilization because aircraft can be scheduled to minimize the amount of time they are on the ground. This, in turn, has reduced the number of aircraft and gate facilities that would otherwise be required and allows for high Employee productivity (headcount per aircraft).

Impact of Fuel Costs on the Company’s Low-Cost Structure; Fuel Initiatives

Although 2015 fuel prices were lower than 2014 fuel prices, Fuel and oil expense remained one of the Company's largest operating costs. The table below shows the Company’s average cost of jet fuel for each year beginning in 2003 and during each quarter of 2015.

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Year	Cost (Millions)		Average Cost Per Gallon		Percentage of     Operating Expenses
2003	$	920	$	0.80	16.5	%
2004	$	1,106	$	0.92	18.1	%
2005	$	1,470	$	1.13	21.4	%
2006	$	2,284	$	1.64	28.0	%
2007	$	2,690	$	1.80	29.7	%
2008	$	3,713	$	2.44	35.1	%
2009	$	3,044	$	2.12	30.2	%
2010	$	3,620	$	2.51	32.6	%
2011	$	5,644	$	3.19	37.7	%
2012	$	6,120	$	3.30	37.2	%
2013	$	5,763	$	3.16	35.1	%
2014	$	5,293	$	2.93	32.3	%
2015	$	3,616	$	1.90	23.0	%
First Quarter 2015	$	877	$	2.01	24.1	%
Second Quarter 2015	$	1,005	$	2.03	25.0	%
Third Quarter 2015	$	936	$	1.98	22.9	%
Fourth Quarter 2015	$	798	$	1.65	20.2	%

The Company enters into fuel derivative contracts to manage its risk associated with significant increases in fuel prices; however, as is evidenced by the table above, energy prices can fluctuate significantly in a relatively short amount of time, and the cost of hedging generally increases with sustained high potential for volatility in the fuel market. Therefore, the Company continually monitors and adjusts its fuel hedge portfolio and strategies to address not only fuel price increases, but also fuel price volatility, hedge costs, and hedge collateral requirements. The Company’s fuel hedging activities are discussed in more detail below under “Risk Factors,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and Note 10 to the Consolidated Financial Statements.

During 2015, the Company continued to focus on reducing fuel consumption and improving efficiency through fleet modernization and other fuel initiatives. The Company continued to replace its older aircraft with newer aircraft that are less maintenance intensive and more fuel efficient. For example, during 2015, the Company took delivery of 19 Boeing 737-800 aircraft and 24 Boeing 737-700 aircraft. In 2016, the Company currently expects to take delivery of an additional 36 Boeing 737-800 aircraft and 17 Boeing 737-700 aircraft. As further discussed in "Management's Discussion and Analysis of Financial Condition and Results of Operations" and in Note 1 to the Consolidated Financial Statements, the Company recently announced its intent to accelerate the retirement of its 737-300 and 737-500 aircraft. The Company's fleet composition and delivery schedule is discussed in more detail below under "Properties - Aircraft." The Company also continued to participate in Required Navigation Performance (“RNP”) operations as part of the FAA’s Performance Based Navigation program. RNP combines the capabilities of advanced aircraft avionics, Global Positioning System satellite navigation (instead of less precise ground-based navigation), and new flight procedures to produce more efficient flight patterns and conserve fuel. The Company’s RNP activities are discussed further under “Regulation - Environmental Regulation."

The table below illustrates the Company's available seat miles produced per fuel gallon consumed over the last five years:

	Year ended December 31,
	2015	2014	2013	2012	2011
Available seat miles per fuel gallon consumed	73.9	72.8	71.7	69.4	68.3

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Fare Structure

General

Southwest offers a relatively simple fare structure that features competitive, unrestricted, unlimited, everyday coach fares, as well as lower fares available on a restricted basis. Southwest bundles fares into three major categories: “Wanna Get Away^®,” “Anytime^SM,” and “Business Select^®,” with the goal of making it easier for Customers to choose the fare they prefer. All fare products include the privilege of two free checked bags (weight and size limits apply). In addition, regardless of the fare product, Southwest does not charge fees for changes to flight reservations.

• “Wanna Get Away” fares are generally the lowest fares and are typically subject to advance purchase requirements. They are nonrefundable but, subject to compliance with Southwest’s No Show policy, funds may be applied to future travel on Southwest without a change fee. Southwest’s No Show policy applies if a Customer has booked a nonrefundable fare anywhere in his/her itinerary and that portion of the flight is not used and not canceled or changed by the Customer at least ten minutes prior to scheduled departure. In such event, subject to certain exceptions, all unused funds on the full itinerary will be forfeited, and the remaining reservation will be canceled. The intent of the No Show policy is to promote Customer behavior that will enable Southwest to re-sell the open seat prior to departure.

• “Anytime” fares are refundable and changeable, and funds may also be applied toward future travel on Southwest. Anytime fares also include a higher frequent flyer point multiplier under Southwest’s Rapid Rewards® frequent flyer program than do Wanna Get Away fares. The Company's frequent flyer program is discussed below under "Rapid Rewards Frequent Flyer Program."

• “Business Select” fares are refundable and changeable, and funds may be applied toward future travel on Southwest. Business Select fares also include additional perks, when available, such as priority boarding in the first 15 boarding positions within boarding group “A,” a higher frequent flyer point multiplier than other Southwest fares (including twice as many points per dollar spent as compared with Wanna Get Away fares), “Fly By^®” priority security and/or ticket counter access in participating airports, and one complimentary adult beverage coupon for the day of travel (for Customers of legal drinking age).

Ancillary Services

The Company offers ancillary service offerings such as Southwest’s EarlyBird Check-In^® and transportation of pets and unaccompanied minors, in accordance with Southwest's respective policies. EarlyBird Check-In provides Customers with automatic check-in before general boarding positions become available, improving Customers' seat selection options (priority boarding privileges are already a benefit of being an "A-List" tier member under the Company's Rapid Rewards Frequent Flyer Program). Southwest’s Pet Policy provides Customers an opportunity to bring a small cat or dog into the aircraft cabin. Southwest also has an unaccompanied minor travel policy to address the administrative costs and the extra care necessary to safely transport these Customers.

When available, Southwest also sells, at the gate, open priority boarding positions in the first 15 positions in its "A" boarding group.

Southwest offers inflight satellite-based WiFi service on all of its 737-700 and 737-800 aircraft, representing over 80 percent of Southwest’s fleet. Southwest’s Customers with small portable electronic devices are able to utilize the airline’s onboard WiFi from gate-to-gate when travelling on a Southwest WiFi-enabled airplane. Southwest was the first carrier to offer gate-to-gate connectivity. Southwest’s onboard entertainment options on WiFi-enabled aircraft for viewing on Customers’ personal wireless devices include free access to Southwest’s live and on-demand television product. The television product currently consists of 19 live channels and up to 75 on-demand recorded episodes from popular television series. Due to licensing restrictions, free live TV may not be available onboard WiFi-enabled international flights. Southwest also provides movies-on-demand, and also offers a Messaging-only option, including all WiFi-enabled stops and connections. The Messaging service allows access to iMessage and pre-downloaded apps for Viber and WhatsApp. Customers do not have to purchase WiFi to access television offerings, movies-on-demand, or the Messaging-only service.

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Rapid Rewards Frequent Flyer Program

Southwest’s Rapid Rewards frequent flyer program enables program members (“Members”) to earn points for every dollar spent on Southwest fares. The amount of points earned under the program is based on the fare and fare class purchased, with higher fare products (e.g., Business Select) earning more points than lower fare products (e.g., Wanna Get Away). Each fare class is associated with a points earning multiplier, and points for flights are calculated by multiplying the fare for the flight by the fare class multiplier. Likewise, the amount of points required to be redeemed for a flight is based on the fare and fare class purchased. Under the program (i) Members are able to redeem their points for every available seat, every day, on every flight, with no blackout dates; and (ii) points do not expire so long as the Member has points-earning activity during the most recent 24 months.

Under the program, Members continue to accumulate points until the time they decide to redeem them. As a result, the program provides Members significant flexibility and options for earning and redeeming rewards. For example, Members can earn more points (and/or achieve tiered status such as A-List and Companion Pass faster) by purchasing higher fare tickets. Members also have significant flexibility in redeeming points, such as the opportunity to book in advance to take advantage of a lower fare (including many fare sales) ticket by redeeming fewer points or by being able to redeem more points and book at the last minute if seats are still available for sale. Members can also earn points through qualifying purchases with Rapid Rewards Partners (which include, for example, car rental agencies, hotels, restaurants, and retailers), as well as by using Southwest’s co-branded Chase^® Visa credit card. In addition, holders of Southwest’s co-branded Chase Visa credit card are able to redeem their points for items other than travel on Southwest, such as international flights on other airlines, cruises, hotel stays, rental cars, gift cards, event tickets, and more. In addition to earning points for revenue flights and qualifying purchases with Rapid Rewards Partners, Members also have the ability to purchase, gift, and transfer points, as well as the ability to donate points to selected charities.

Southwest’s Rapid Rewards frequent flyer program features tier and Companion Pass programs for the most active Members, including “A-List” and “A-List Preferred” status. Both A-List and A-List Preferred Members enjoy benefits such as “Fly By^®” priority check-in and security lane access, where available, as well as dedicated phone lines, standby priority, and an earnings bonus on eligible revenue flights (25 percent for A-List and 100 percent for A-List Preferred). In addition, A-List Preferred Members enjoy free inflight WiFi on equipped flights. Members who attain A-List or A-List Preferred status receive priority boarding privileges for an entire year. When these Customers purchase travel at least 36 hours prior to flight time, they receive the best boarding pass number available (generally, an “A” boarding pass). Members who fly 100 qualifying one-way flights or earn 110,000 qualifying points in a calendar year automatically receive a Companion Pass, which provides for unlimited free travel for one year to any destination available on Southwest for a designated companion of the qualifying Member. The Member and designated companion must travel together on the same flight.

Southwest’s Rapid Rewards frequent flyer program has been designed to drive more revenue by (i) bringing in new Customers, including new Members, as well as new holders of Southwest’s co-branded Chase Visa credit card; (ii) increasing business from existing Customers; and (iii) strengthening the Company’s Rapid Rewards hotel, rental car, credit card, and retail partnerships. The program continues to exceed the Company’s expectations with respect to the number of Members added, the amount spent per Member on airfare, the number of flights taken by Members, the number of Southwest’s co-branded Chase Visa credit card holders added, the number of points sold to business partners, and the number of frequent flyer points purchased by Members. During 2015, the Company entered into an amended co-branded credit card agreement with Chase Bank USA, N.A. Additional information regarding this amended co-branded credit card agreement, including the effect of the resulting change in accounting methodology, is provided below under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 1 to the Consolidated Financial Statements.

For the Company’s 2015 consolidated results, Customers of Southwest redeemed approximately 7.3 million flight awards, accounting for approximately 12.0 percent of revenue passenger miles flown. For the Company’s 2014 consolidated results, Customers of Southwest and AirTran redeemed approximately 6.2 million flight awards, accounting for approximately 11.0 percent of revenue passenger miles flown. For the Company’s 2013 consolidated results, Customers of Southwest and AirTran redeemed approximately 5.4 million flight awards, accounting for approximately 9.5 percent of revenue passenger miles flown. The Company’s accounting policies with respect to its frequent flyer programs are discussed in more detail in Note 1 to the Consolidated Financial Statements.

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Southwest.com

The Company’s Internet website, Southwest.com^®, is the only avenue for Southwest Customers to purchase and manage travel online. Customers’ trips can be planned and managed directly from the southwest.com home page. Southwest.com is designed to help make the Customer's experience personal and intuitive with features such as recognizing the Customer's location to provide relevant deals, remembering recent searches to make it easy to get to trips of interest, and shopping cart functionality allowing Customers to purchase air, hotel, and car rental in one visit. The newly redesigned “My Accounts” section of the website provides a detailed view into a Customer’s travel and loyalty activity. Southwest.com highlights points of differentiation between Southwest and other air carriers, as well as the fact that southwest.com is the only place where Customers can purchase Southwest fares online. In addition, southwest.com and swabiz.com (the Company’s business travel reservation web page) are available in a translated Spanish version, which provides Customers who prefer to transact in Spanish the same level of Customer Service provided by the English versions of the websites. Additionally, Southwest offers Customers a mobile website and app to provide Customers the ability to transact with Southwest anytime they have access to their mobile device. For the year ended December 31, 2015, approximately 79.4 percent of the Company’s Passenger revenues came through its website (including revenues from SWABIZ^®).

Marketing

During 2015, the Company continued to benefit from, and aggressively market, Southwest’s points of differentiation from its competitors. In October 2015, the Company premiered a new advertising campaign called Transfarency^SM.. The campaign emphasizes Southwest's approach to treating Customers fairly, honestly, and respectfully, with its low fares and no unexpected bag fees, change fees, or hidden fees.

Southwest continues to be the only major U.S. airline that offers to all ticketed Customers up to two checked bags that fly free (weight and size limits apply). Through both its national and local marketing campaigns, Southwest has continued to aggressively promote this point of differentiation from its competitors with its “Bags Fly Free^®” message. The Company believes its decision not to charge for first and second checked bags on Southwest, as reinforced by the Company’s related marketing campaign, has driven an increase in Southwest’s market share and a resulting net increase in revenues.

Southwest is also the only major U.S. airline that does not charge a fee on any of its fares for a Customer change in flight reservations. The Company has continued to incorporate this key point of differentiation in its marketing campaigns. The campaigns highlight the importance to Southwest of Customer Service by showing that Southwest understands plans can change and therefore does not charge a change fee. While a Customer may pay a difference in airfare, the Customer will not be charged a change fee on top of any difference in airfare.

Also unlike most of its competitors, Southwest does not impose additional fees for items such as seat selection, snacks, curb-side check-in, and telephone reservations. In addition, Southwest allows each ticketed Customer to check one stroller and one car seat free of charge, in addition to the two free checked bags.

The Company also continues to promote all of the many other reasons to fly Southwest such as its low fares, network size, Customer Service, free live television offerings, and its Rapid Rewards frequent flyer program.

In 2014, the Company launched a new visual expression of its brand by introducing a new Heart aircraft livery, airport experience, and logo. Aircraft already in the Company's fleet are scheduled to receive the newly painted livery within the aircraft's existing repainting schedule, while new aircraft will be delivered in the Heart livery. In addition, many of the future airport conversions will be integrated into existing and upcoming airport improvement projects.

Technology Initiatives

During 2015, the Company continued its commitment to technology improvements to support its ongoing operations and initiatives.

The Company is in the midst of a multi-year project to completely replace its reservation system. In 2014, the Company launched the Amadeus Altéa reservations solution to support the Company’s international service. The Company has since begun implementing Amadeus' Altéa reservations solution as the Company's future single reservation system for both domestic and international reservations. This single reservation system is expected to be implemented in 2017 and is expected to (i) provide significant incremental revenue opportunities beyond implementation; (ii) allow the

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Company to offer product enhancements that will benefit Customers; (iii) give the Company a flexible and reliable foundation that will allow it to adapt more quickly and efficiently, and better respond to industry demands; and (iv) reduce the complexities associated with maintaining and operating multiple reservation systems. In August 2015, the Company achieved one of the first milestones of the single reservation system when its Customer Support & Services group (“CS&S”) began using Amadeus Group Manager for international group reservations. This enhanced functionality allows CS&S to book larger numbers of Passengers on a single reservation via streamlined booking processes.

During 2015, the Company also activated a new recovery optimization tool designed to help the Company effectively manage its increasingly complex network. The optimizing tool assists with irregular operations such as out of service events, station reduction, and station shutdown, by considering many factors including passenger and crew connections, airport curfews, equipment mismatches, and mission and maintenance requirements.

The Company intends to continue to devote significant technology resources towards, among other things, (i) the continued development of systems to improve both revenue management and network optimization capabilities, (ii) the aforementioned replacement of Southwest's existing domestic reservation system with the comprehensive Amadeus' Altéa reservations solution, and (iii) tools to improve operational management.

Regulation

The airline industry is heavily regulated, especially by the federal government, and there are a significant number of governmental agencies and legislative bodies that have the ability to directly or indirectly affect the Company and/or the airline industry financially and/or operationally. Examples of regulations affecting the Company and/or the airline industry, imposed by several of these governmental agencies and legislative bodies, are discussed below.

Economic and Operational Regulation

Consumer Protection Regulation by the U.S. Department of Transportation

The U.S. Department of Transportation (the “DOT”) regulates economic operating authority for air carriers and consumer protection for airline passengers. The Federal Aviation Authority (“FAA”), a sub-agency of the DOT, regulates aviation safety. The DOT may impose civil penalties on air carriers for violating its regulations.

To provide passenger transportation in the United States, a domestic airline is required to hold both a Certificate of Public Convenience & Necessity from the DOT and an Air Carrier Operating Certificate from the FAA. A Certificate of Public Convenience & Necessity is unlimited in duration, and the Company’s certificate generally permits it to operate among any points within the United States and its territories and possessions. Additional DOT authority, in the form of a certificate or exemption from certificate requirements, is required for a U.S. airline to serve foreign destinations either with its own aircraft or via code-sharing with another airline. Exemptions granted by the DOT to serve international markets are generally limited in duration and are subject to periodic renewal requirements. The DOT also has jurisdiction over international tariffs and pricing in certain markets. The DOT may revoke a certificate or exemption, in whole or in part, for intentional failure to comply with federal aviation statutes, regulations, orders, or the terms of the certificate itself.

The DOT’s consumer protection and enforcement activities relate to areas such as unfair and deceptive practices and unfair competition by air carriers, deceptive airline advertising (concerning, e.g., fares, ontime performance, schedules, and code-sharing), and violations of rules concerning denied boarding compensation, ticket refunds, and baggage liability requirements. The DOT is also charged with prohibiting discrimination by airlines against consumers on the basis of race, religion, national origin, or sex.

Under the above-described authority, the DOT has adopted so-called “Passenger Protection Rules,” which address a wide variety of matters including flight delays on the tarmac, chronically delayed flights, denied boarding compensation, and advertising of airfares, among others. Under the Passenger Protection Rules, U.S. passenger airlines are required to adopt contingency plans that include the following: (i) assurances that no domestic flight will remain on the airport tarmac for more than three hours and that no international flight will remain on the tarmac at a U.S. airport for more than four hours, unless the pilot-in-command determines there is a safety-related or security-related impediment to deplaning passengers, or air traffic control advises the pilot-in-command that returning to the gate or permitting passengers to disembark elsewhere would significantly disrupt airport operations; (ii) an assurance that air carriers

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will provide adequate food and potable drinking water no later than two hours after the aircraft leaves the gate (in the case of departure) or touches down (in the case of arrival) if the aircraft remains on the tarmac, unless the pilot-in-command determines that safety or security considerations preclude such service; and (iii) an assurance of operable lavatories, as well as adequate medical attention, if needed. Air carriers are required to publish their contingency plans on their websites.

The Passenger Protection Rules also subject airlines to potential DOT enforcement action for unfair and deceptive practices in the event of chronically delayed domestic flights (i.e., domestic flights that operate at least ten times a month and arrive more than 30 minutes late more than 50 percent of the time during that month). In addition, airlines are required to (i) display ontime performance on their websites; (ii) adopt customer service plans, publish those plans on their website, and audit their own compliance with their plans; (iii) designate an employee to monitor the performance of their flights; (iv) provide information to passengers on how to file complaints; and (v) respond in a timely and substantive fashion to consumer complaints.

The Passenger Protection Rules also require airlines to (i) pay up to $1,350 in denied boarding compensation to each passenger involuntarily bumped from a flight; (ii) refund any checked bag fee for permanently lost luggage; (iii) prominently disclose all potential fees for optional ancillary services on their websites; and (iv) refund passenger fees paid for ancillary services if a flight cancels or oversells and a passenger is unable to take advantage of such services.

The Passenger Protection Rules also require that (i) advertised airfares include all government-mandated taxes and fees; (ii) passengers be allowed to hold a reservation for up to 24 hours without making a payment; (iii) passengers be allowed to cancel a paid reservation without penalty for 24 hours after the reservation is made, as long as the reservation is made at least seven days in advance of travel; (iv) fares may not increase after purchase; (v) baggage fees must be disclosed to the passenger at the time of booking; (vi) the same baggage allowances and fees must apply throughout a passenger’s trip; (vii) baggage fees must be disclosed on e-ticket confirmations; and (viii) passengers must be promptly notified in the event of delays of more than 30 minutes or if there is a cancellation or diversion of their flight.

The DOT has issued a proposed rule that would further expand the Passenger Protection Rules. First, the proposed rule would require airlines to share with ticket agents fee information for “basic ancillary services,” including fees for a first checked bag, second checked bag, carry-on items, and advance seat selection. Second, the proposed rule would require enhanced reporting of information to the DOT by mainline carriers for their domestic code-share partner operations. Third, the proposed rule would require ticket agencies to disclose which carriers' tickets they sell to avoid leading consumers to mistakenly believe they are searching all possible flight options when in fact other options may be available. Fourth, the proposed rule would impose a variety of additional requirements on ticket agents and air carriers, such as public disclosures of information. The Company is not able to predict the impact of any new consumer protection rules on its services, although the Company is likely to be affected to a lesser degree than most other airlines, which generally offer more ancillary products and services, and sell their services largely via ticket agencies. The DOT is expected to issue a final rule in this proceeding in 2016.

The DOT has expressed its intent to aggressively investigate alleged violations of its consumer protection rules. Airlines that violate any DOT regulation are subject to potential fines of up to $27,500 per occurrence.

The Company is also monitoring other potential rulemakings that could impact its business such as (i) an FAA proposed rule designed to tighten the utilization requirements for takeoff and landing slots operated by air carriers at the three New York City airports; (ii) a DOT proposed rule to change the metric by which the DOT computes an air carrier’s mishandled baggage performance; (iii) a DOT proposed rule to require air carriers to publicly disclose the revenues received from the sale of ancillary services to passengers; (iv) a potential DOT proposed rule to enhance accessibility for disabled passengers with respect to aircraft lavatories and in-flight entertainment; and (v) a potential DOT proposed rule to restrict passenger cell phone voice calls on aircraft.

Aviation Taxes and Fees

The statutory authority for the federal government to collect most types of aviation taxes, which are used, in part, to finance programs administered by the FAA, must be periodically reauthorized by the U.S. Congress. In 2012, Congress adopted the FAA Modernization and Reform Act of 2012, which extended most commercial aviation taxes through

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September 30, 2015. In September 2015, Congress extended the expiration date for an additional six months. Congress is expected to try to enact a new FAA reauthorization bill in 2016, which may make substantive changes with respect to aviation taxes (including, possibly, airport-assessed passenger facility charges) and/or FAA offices and programs that are financed through aviation tax revenue. Congress must either adopt a new FAA reauthorization bill or pass a “status quo” extension by April 1, 2016; otherwise, a lapse in the statutory authority could affect the airlines’ and passengers’ respective tax burdens, as well as impact the FAA’s ability to fund airport grants and regulate the airline industry.

In addition to FAA-related taxes, there are additional federal taxes related to the Department of Homeland Security. These taxes do not need to be reauthorized periodically. Congress has set the Transportation Security Fee paid by passengers at $5.60 per one-way passenger trip. In December 2015, Congress enacted another statute that indexes immigration and customs fees to inflation, beginning in 2016. These two fees are paid by inbound international passengers and are used to support the operations of U.S. Customs and Border Protection (“CBP”). Finally, the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service published a final regulation in October 2015 that modifies international agriculture inspection fees. Under this new rule, effective December 28, 2015, the per-passenger agriculture inspection fee is $5.00 and the per-commercial aircraft fee is $225.00.

In 2016, in addition to FAA reauthorization legislation, Congress may consider comprehensive tax reform legislation, which could result in a lower corporate tax rate and the elimination of certain tax deductions and preferences. Grants to airports and/or airport bond financing may also be affected through future legislation, which could result in higher fees, rates, and charges at many of the airports the Company serves.

Operational, Safety, and Health Regulation

The FAA has the authority to regulate safety aspects of civil aviation operations. Specifically, the Company and its third-party service providers are subject to the jurisdiction of the FAA with respect to aircraft maintenance and operations, including equipment, ground facilities, dispatch, communications, flight training personnel, and other matters affecting air safety. The FAA, acting through its own powers or through the appropriate U.S. Attorney, has the power to bring proceedings for the imposition and collection of fines for violation of the FAA regulations.

To address compliance with its regulations, the FAA requires airlines to obtain the Air Carrier Operating Certificate and other certificates, approvals, and authorities. These certificates, approvals, and authorities are subject to suspension or revocation for cause.

The FAA has rules in effect with respect to flight, duty, and rest regulations. Among other things, the rules require a ten hour minimum rest period prior to a pilot’s flight duty period; mandate that a pilot must have an opportunity for eight hours of uninterrupted sleep within the rest period; and impose pilot “flight time” and “duty time” limitations based upon report times, the number of scheduled flight segments, and other operational factors. The rules affect the Company’s staffing flexibility, which could impact the Company’s operational performance, costs, and Customer Experience.

In addition to its role as safety regulator, the FAA also operates the nation’s air traffic control system and is in the midst of implementing a multi-faceted “next generation” air traffic control system (“NextGen”). The Air Traffic Organization (“ATO”) is the operational arm of the FAA. The ATO is responsible for providing safe and efficient air navigation services to all of the United States and large portions of the Atlantic and Pacific Oceans and the Gulf of Mexico. The Company is subject to any operational changes imposed by the FAA/ATO as they relate to the “NextGen” program, as well as the day-to-day management of the air traffic control system. The FAA reauthorization discussed above under “Aviation Taxes and Fees,” as well as the annual appropriation legislation that will fund the DOT and the FAA in federal fiscal year 2017, could include provisions impacting future FAA safety-related activities and ATO operations in 2016 and beyond.

The Company is subject to various other federal, state, and local laws and regulations relating to occupational safety and health, including Occupational Safety and Health Administration and Food and Drug Administration regulations.

Security Regulation

Pursuant to the Aviation and Transportation Security Act (“ATSA”), the Transportation Security Administration (the “TSA”), a division of the U.S. Department of Homeland Security, is responsible for certain civil aviation security

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matters. ATSA and subsequent TSA regulations and procedures implementing ATSA address, among other things, (i) flight deck security; (ii) the use of federal air marshals onboard flights; (iii) airport perimeter access security; (iv) airline crew security training; (v) security screening of passengers, baggage, cargo, mail, employees, and vendors; (vi) training and qualifications of security screening personnel; (vii) provision of passenger data to CBP; and (viii) background checks. Under ATSA, substantially all security officers at airports are federal employees, and significant other elements of airline and airport security are overseen and performed by federal employees, including federal security managers, federal law enforcement officers, and federal air marshals. TSA personnel and TSA-mandated security procedures can affect the Company’s operations, costs, and Customer experience. For example, as part of its security measures, the TSA regulates the types of liquid items that can be carried onboard aircraft. In addition, as part of its Secure Flight program, the TSA requires airlines to collect a passenger’s full name (as it appears on a government-issued ID), date of birth, gender, and Redress Number (if applicable). Airlines must transmit this information to Secure Flight, which uses the information to perform matching against terrorist watch lists. After matching passenger information against the watch lists, Secure Flight transmits the matching results back to airlines. This serves to identify individuals for enhanced security screening and to prevent individuals on watch lists from boarding an aircraft. It also helps prevent the misidentification of passengers who have names similar to individuals on watch lists. The TSA has also implemented enhanced security procedures as part of its enhanced, multi-layer approach to airport security, including physical pat down procedures, at security checkpoints. Such enhanced security procedures have raised privacy concerns by some air travelers.

The Company, in conjunction with the TSA and CBP, participates in TSA PreCheck™, a pre-screening initiative that allows a select group of low risk passengers to move through security checkpoints with greater efficiency and ease when traveling. Eligible passengers may use dedicated screening lanes at certain airports the Company serves for screening benefits, which include leaving on shoes, light outerwear, and belts, as well as leaving laptops and permitted liquids in carryon bags.

The Company also participates in the TSA Known Crewmember^® program, which is a risk-based screening system that enables TSA security officers to positively verify the identity and employment status of flight-crew members. The program expedites flight crew member access to sterile areas of airports.

The Company works collaboratively with foreign national governments and airports to provide risk-based security measures at international departure locations.

The Company has also made significant investments to address the effect of security regulations, including investments in facilities, equipment, and technology to process Customers, checked baggage, and cargo efficiently; however, the Company is not able to predict the impact, if any, that various security measures or the lack of TSA resources at certain airports will have on Passenger revenues and the Company’s costs, either in the short-term or the long-term.

Environmental Regulation

The Company is subject to various federal laws and regulations relating to the protection of the environment, including the Clean Air Act, the Resource Conservation and Recovery Act, the Clean Water Act, the Safe Drinking Water Act, and the Comprehensive Environmental Response, Compensation and Liability Act, as well as state and local laws and regulations. These laws and regulations govern aircraft drinking water, emissions, and storm water discharges from operations, and the disposal of materials such as jet fuel, chemicals, hazardous waste, and aircraft deicing fluid. Additionally, in conjunction with airport authorities, other airlines, and state and local environmental regulatory agencies, the Company, as a normal course of business, undertakes voluntary investigation or remediation of soil or groundwater contamination at several airport sites. The Company does not believe that any environmental liability associated with these airport sites will have a material adverse effect on the Company’s operations, costs, or profitability, nor has it experienced any such liability in the past that has had a material adverse effect on its operations, costs, or profitability. Further regulatory developments pertaining to the control of engine exhaust emissions from ground support equipment could increase operating costs in the airline industry. The Company does not believe, however, that pending environmental regulatory developments in this area will have a material effect on the Company’s capital expenditures or otherwise materially adversely affect its operations, operating costs, or competitive position.

The federal government, as well as several state and local governments, the governments of other countries, and the United Nations’ International Civil Aviation Organization (“ICAO”) are considering legislative and regulatory proposals and voluntary measures to address climate change by reducing green-house gas emissions. At the federal

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level, on July 1, 2015, the Environmental Protection Agency (the “EPA”) issued a proposed endangerment finding for greenhouse gas emissions from aircraft. That proposal is expected to be finalized sometime in 2016. The EPA would be required under the Clean Air Act to regulate greenhouse gases from aircraft if it determines the emissions endanger public health or the environment. In addition, along with its proposed endangerment finding, the EPA published an advance notice of proposed rulemaking summarizing international efforts to regulate aircraft emissions. ICAO could adopt a carbon dioxide standard for aircraft in 2016 and possibly a larger international framework for aviation emissions. Regardless of the method of regulation, policy changes with regards to climate change are possible, which could significantly increase operating costs in the airline industry and, as a result, adversely affect operations.

In addition to climate change, aircraft noise continues to be an environmental focus, especially as the FAA implements new flight procedures as part of its “NextGen” airspace modernization program discussed below. The Airport Noise and Capacity Act of 1990 gives airport operators the right, under certain circumstances, to implement local noise abatement programs, so long as they do not unreasonably interfere with interstate or foreign commerce or the national air transportation system. Some airports have established airport restrictions to limit noise, including restrictions on aircraft types to be used and limits on the number of hourly or daily operations or the time of operations. These types of restrictions can cause curtailments in service or increases in operating costs and can limit the ability of air carriers to expand operations at the affected airports. At the federal level, the FAA is considering changes in 2016 to enhance community engagement when developing new flight procedures, and there is a possibility that Congress may enact legislation in 2016 to address local noise concerns at one or more commercial airports in the United States.

The Company has undertaken a number of fuel conservation and carbon emission reduction initiatives such as the following:

• installation of blended winglets, which reduce drag and increase fuel efficiency, on all Boeing 737-700 and 737-800 aircraft in Southwest’s fleet and on a majority of Southwest’s 737-300 aircraft;

• upgrading of the Company’s 737-800 fleet with newly designed, split scimitar winglets;

• periodic engine washes;

• use of electric ground power for aircraft air and power at the gate and for ground support equipment at select locations;

• deployment of auto-throttle and vertical navigation to maintain optimum cruising speeds;

• implementation of engine start procedures to support the Company's single engine taxi procedures;

• adjustment of the timing of auxiliary power unit starts on originating flights to reduce auxiliary power unit usage;

• implementation of fuel planning initiatives to safely reduce loading of excess fuel;

• Evolve aircraft cabin interior retrofitting featuring lighter seats;

• reduction of aircraft engine idle speed while on the ground, which also increases engine life;

• galley refreshes with dry goods weight reduction;

• Company optimized routes (flying the best wind routes to take advantage of tailwinds or to minimize headwinds);

• improvements in flight planning algorithms to better match the Company's aircraft flight management system (and thereby enabling the Company to fly at the most efficient altitudes);

• substitution of Pilot flight bags with lighter Electronic Flight Bag tablets; and

• implementation of Real Time Descent Winds (automatic uplinking of up-to-date wind data to the aircraft allowing crews to time the descent to minimize thrust inputs).

The Company has also participated in Required Navigation Performance (“RNP”) operations as part of the FAA’s Performance Based Navigation program, which is intended to modernize the U.S. Air Traffic Control System by addressing limitations on air transportation capacity and making more efficient use of airspace. RNP combines the

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capabilities of advanced aircraft avionics, Global Positioning System ("GPS") satellite navigation (instead of less precise ground-based navigation), and new flight procedures to (i) enable aircraft to carry navigation capabilities rather than relying on airports; (ii) improve operational capabilities by opening up many new and more direct airport approach paths to produce more efficient flight patterns; and (iii) conserve fuel, improve safety, and reduce carbon emissions. By the end of 2015, Southwest had conducted over 23,000 RNP approaches, including approximately 5,000 in 2015. Southwest must rely on RNP approaches published by the FAA, and the rate of introduction of RNP approaches continues to be slower than expected, with fuel efficient RNP approaches currently available at only 46 of Southwest’s airports. In addition, even at airports with approved RNP approaches, the clearance required from air traffic controllers to perform RNP approaches is sometimes not granted. Southwest continues to work with the FAA to develop more RNP approaches and to modify air traffic control rules to support greater utilization of RNP.

As part of its commitment to corporate sustainability, the Company has published the Southwest One Report^TM describing the Company’s sustainability strategies, which include these and other efforts to reduce greenhouse gas emissions and address other environmental matters such as energy and water conservation, waste minimization, and recycling.

International Regulation

All international air service is subject to certain U.S. federal requirements and approvals, as well as the regulatory requirements of the appropriate authorities of the foreign countries involved. The Company has obtained the necessary economic authority from the DOT, as well as approvals required by the FAA and applicable foreign government entities, to conduct operations, under certain circumstances, to points outside of the continental United States currently served by the Company. Certain international authorities and approvals held by the Company are subject to periodic renewal requirements. The Company requests extensions of such authorities and approvals when and as appropriate. To the extent the Company seeks to serve additional foreign destinations in the future, or to renew its authority to serve certain routes, it may be required to obtain necessary authority from the DOT and/or approvals from the FAA, as well as any applicable foreign government entity.

Certain international route authorities are governed by bilateral air transportation agreements between the United States and foreign countries. Changes in U.S. or foreign government aviation policies could result in the alteration or termination of such agreements, diminish the value of the Company’s existing international authorities, present barriers to renewing existing or securing new authorities, or otherwise affect the Company’s international operations. Bilateral agreements between the United States and foreign countries the Company currently serves, or may serve in the future, may be subject to renegotiation from time to time. While the U.S. government has negotiated “open skies” agreements with many countries, which allow for unrestricted access between the United States and respective foreign destinations, agreements with other countries may restrict the Company’s entry and/or growth opportunities. For example, the bilateral air transport agreement currently in force between the United States and Mexico imposes limitations on the number of U.S. air carriers that may operate on city-pair routes between points in the United States and points in Mexico. These restrictions currently prevent the Company from entering certain U.S.-Mexico routes on which it would like to provide service. Although the United States and Mexican governments signed a new bilateral agreement on December 18, 2015, that would remove such restrictions and thereby provide greater market access by U.S. carriers to Mexico, that agreement does not take effect until ratification by the Mexican legislature occurs and other diplomatic procedures are completed. The Company is not able to predict if or when the new U.S.-Mexico bilateral aviation agreement will officially enter into force.

The CBP is the federal agency of the U.S. Department of Homeland Security charged with facilitating international trade, collecting import duties, and enforcing U.S. regulations with respect to trade, customs, and immigration. As the Company expands its international flight offerings, CBP and its requirements and resources will also become increasingly important considerations to the Company. For instance, with the exception of flights from a small number of foreign “preclearance” locations, arriving international flights may only land at CBP-designated airports, and CBP officers must be present and in sufficient quantities at those airports to effectively process and inspect arriving international passengers and cargo. Thus, CBP personnel and CBP-mandated procedures can affect the Company’s operations, costs, and Customer experience. The Company has made and expects to continue to make significant investments in facilities, equipment, and technologies at certain airports in order to improve the Customer experience and to assist CBP with its inspection and processing duties; however, the Company is not able to predict the impact,

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if any, that various CBP measures or the lack of CBP resources will have on Company revenues and costs, either in the short-term or the long-term.

Insurance

The Company carries insurance of types customary in the airline industry and in amounts deemed adequate to protect the Company and its property and to comply both with federal regulations and certain of the Company’s credit and lease agreements. The policies principally provide coverage for public and passenger liability, property damage, cargo and baggage liability, loss or damage to aircraft, engines, and spare parts, and workers’ compensation. In addition, the Company carries a cyber-security insurance policy with regards to data protection and business interruption associated with both security breaches from malicious parties and from certain system failures.

Through the 2003 Emergency Wartime Supplemental Appropriations Act (the “Wartime Act”), the federal government has in the past provided war-risk insurance coverage to commercial carriers, including for losses from terrorism, for passengers, third parties (ground damage), and the aircraft hull. However, since the government-provided supplemental coverage from the Wartime Act was set to expire on September 30, 2014, the Company proactively canceled its government provided war-risk insurance coverage prior to that date and purchased comparable coverage via the commercial insurance marketplace. Although the Company was able to purchase comparable coverage via the commercial insurance marketplace, available commercial insurance in the future could be more expensive and/or have material differences in coverage than is currently provided and may not be adequate to protect the Company's risk of loss from future acts of terrorism.

Competition

Competition within the airline industry is intense and highly unpredictable, and Southwest currently competes with other airlines on virtually all of its scheduled routes. As a result of moderately improved economic conditions and an increased focus by airlines on costs, the airline industry has become increasingly competitive in recent years with healthier financial condition and improved profitability.

Key competitive factors within the airline industry include (i) pricing and cost structure; (ii) routes, frequent flyer programs, and schedules; and (iii) customer service, comfort, and amenities. Southwest also competes for customers with other forms of transportation, as well as alternatives to travel. In recent years, the majority of domestic airline service has been provided by Southwest and the other largest major U.S. airlines, including American Airlines, Delta Air Lines, and United Airlines. The DOT defines major U.S. airlines as those airlines with annual revenues of at least $1 billion; there are currently 13 passenger airlines offering scheduled service, including Southwest, that meet this standard.

Pricing and Cost Structure

Pricing is a significant competitive factor in the airline industry, and the availability of fare information on the Internet allows travelers to easily compare fares and identify competitor promotions and discounts. Pricing can be driven by a variety of factors. For example, airlines often discount fares to drive traffic in new markets or to stimulate traffic when necessary to improve load factors and/or cash flow. In addition, multiple airlines have been able to reduce fares because they have been able to lower their operating costs as a result of reorganization within and outside of bankruptcy. Further, some of the Company’s competitors have continued to grow and modernize their fleets and expand their networks, potentially enabling them to better control costs per available seat mile (the average cost to fly an aircraft seat (empty or full) one mile), which in turn may enable them to lower their fares.

The Company believes its low-cost operating structure continues to provide it with an advantage over many of its airline competitors by enabling it to continue to charge low fares. The Company also believes it has gained a competitive advantage by differentiating Southwest from all of its major competitors by not charging additional fees for items such as first and second checked bags, flight changes, seat selection, snacks, curb-side check-in, and telephone reservations.

Routes, Frequent Flyer Programs, and Schedules

The Company also competes with other airlines based on markets served, frequent flyer opportunities, and flight schedules. Some major airlines have more extensive route structures than Southwest, including more extensive international networks. In addition, many competitors have entered into significant commercial relationships with other airlines, such as global alliances, code-sharing, and capacity purchase agreements, which increase the airlines’

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opportunities to expand their route offerings. For example, an alliance or code-sharing agreement enables an airline to offer flights that are operated by another airline and also allows the airline’s customers to book travel that includes segments on different airlines through a single reservation or ticket. As a result, depending on the nature of the specific alliance or code-sharing arrangement, a participating airline may be able to (i) offer its customers access to more destinations than it would be able to serve on its own, (ii) gain exposure in markets it does not otherwise serve, or (iii) increase the perceived frequency of its flights on certain routes. Alliance and code-sharing arrangements not only provide additional route flexibility for participating airlines, they can also allow these airlines to offer their customers more opportunities to earn and redeem frequent flyer miles or points. A capacity purchase agreement enables an airline to expand its route structure by paying another airline (e.g., a regional airline with smaller aircraft) to operate flights on its behalf in markets that it does not, or cannot, serve itself. The Company continues to evaluate and implement initiatives to better enable itself to offer additional itineraries.

Customer Service, Comfort, and Amenities

Southwest also competes with other airlines in areas of Customer Service such as ontime performance, passenger amenities, flight equipment type, and comfort. According to statistics published by the DOT, Southwest consistently ranks at or near the top among domestic carriers in Customer Satisfaction for having the lowest Customer complaint ratio. Some airlines have more seating options and associated passenger amenities than does Southwest, including first-class, business class, and other premium seating and related amenities. Additionally, some major U.S. airlines, including Southwest, are adding a significant number of new aircraft to their fleets. Such efforts could provide cost benefits to these airlines through fleet simplification, improved fuel efficiencies, and lower maintenance costs. Additionally, such new aircraft could have newer and different passenger amenities than those contained in the Company’s existing fleet.

Other Forms of Competition

The airline industry is subject to varying degrees of competition from surface transportation by automobiles, buses, and trains. Inconveniences and delays associated with air travel security measures can increase surface competition. In addition, surface competition can be significant during economic downturns when consumers cut back on discretionary spending and fewer choose to fly, or when gasoline prices are lower, making surface transportation a less expensive option. Because of the relatively high percentage of short-haul travel provided by Southwest, it is particularly exposed to competition from surface transportation in these instances. The airline industry is also subject to competition from alternatives to travel such as videoconferencing and the Internet, which can increase in the event of travel inconveniences and economic downturns. The Company is subject to the risk that air travel inconveniences and economic downturns may, in some cases, result in permanent changes to consumer behavior in favor of surface transportation and electronic communications.

Seasonality

The Company’s business is seasonal. Generally, in most markets the Company serves, demand for air travel is greater during the summer months, and therefore, revenues in the airline industry tend to be stronger in the second (April 1 - June 30) and third (July 1 - September 30) quarters of the year than in the first (January 1 - March 31) and fourth (October 1 - December 31) quarters of the year. As a result, in many cases, the Company’s results of operations reflect this seasonality. Factors that could alter this seasonality include, among others, the price of fuel, general economic conditions, extreme or severe weather, fears of terrorism or war, or changes in the competitive environment. Therefore, the Company’s quarterly operating results are not necessarily indicative of operating results for the entire year, and historical operating results in a quarterly or annual period are not necessarily indicative of future operating results.

Employees

At December 31, 2015, the Company had approximately 49,600 active fulltime equivalent Employees, consisting of 21,100 flight, 2,800 maintenance, 17,300 ground, Customer, and fleet service, and 8,400 management, technology, finance, marketing, and clerical personnel (associated with non-operational departments). Approximately 83 percent of these Employees were represented by labor unions. The Railway Labor Act establishes the right of airline employees to organize and bargain collectively. Under the Railway Labor Act, collective-bargaining agreements between an airline and a labor union generally do not expire, but instead become amendable as of an agreed date. By the amendable date, if either party wishes to modify the terms of the agreement, it must notify the other party in the manner required by

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the Railway Labor Act and/or described in the agreement. After receipt of the notice, the parties must meet for direct negotiations. If no agreement is reached, either party may request the National Mediation Board to appoint a federal mediator. If no agreement is reached in mediation, the National Mediation Board may determine an impasse exists and offer binding arbitration to the parties. If either party rejects binding arbitration, a 30-day “cooling off” period begins. At the end of this 30-day period, the parties may engage in “self-help,” unless a Presidential Emergency Board is established to investigate and report on the dispute. The appointment of a Presidential Emergency Board maintains the “status quo” for an additional 60 days. If the parties do not reach agreement during this period, the parties may then engage in “self-help.” “Self-help” includes, among other things, a strike by the union or the airline’s imposition of any or all of its proposed amendments and the hiring of new employees to replace any striking workers. The following table sets forth the Company’s Employee groups and the status of the respective collective-bargaining agreements as of December 31, 2015:

Employee Group	Approximate Number of Employees	Representatives	Status of Agreement
Southwest Pilots	7,600	Southwest Airlines Pilots’ Association (“SWAPA”)	In negotiations
Southwest Flight Attendants	13,100	Transportation Workers of America, AFL-CIO, Local 556 (“TWU 556”)	In negotiations
Southwest Ramp, Operations, Provisioning, Freight Agents	11,000	Transportation Workers of America, AFL-CIO, Local 555 (“TWU 555”)	The Company reached a tentative agreement with TWU 555 in December 2015. TWU 555 has presented the contract to its members for ratification. If ratified, the contract will become amendable in 2021.
Southwest Customer Service Agents, Customer Representatives	6,300	International Association of Machinists and Aerospace Workers, AFL-CIO (“IAM 142”)	Amendable December 2018
Southwest Material Specialists (formerly known as Stock Clerks)	300	International Brotherhood of Teamsters, Local 19 (“IBT 19”)	In negotiations
Southwest Mechanics	2,300	Aircraft Mechanics Fraternal Association (“AMFA”)	In negotiations
Southwest Aircraft Appearance Technicians	200	AMFA	Amendable February 2017
Southwest Facilities Maintenance Technicians	40	AMFA	In negotiations
Southwest Dispatchers	300	Transportation Workers of America, AFL-CIO, Local 550 (“TWU 550”)	Amendable November 2019
Southwest Flight Simulator Technicians	30	International Brotherhood of Teamsters (“IBT”)	Amendable April 2019
Southwest Flight Crew Training Instructors	80	Transportation Workers of America, AFL-CIO, Local 557 (“TWU 557”)	In negotiations
Southwest Meteorologists	7	TWU 550	Amendable June 2019
Southwest Source of Support Representatives	90	IAM 142	In negotiations

Additional Information About the Company

The Company was incorporated in Texas in 1967. The following documents are available free of charge through the Company’s website, www.southwest.com: the Company’s annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and any amendments to those reports that are filed with or furnished to the Securities and Exchange Commission (“SEC”) pursuant to Sections 13(a) or 15(d) of the Securities Exchange Act of 1934. These materials are made available through the Company’s website as soon as reasonably practicable

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after they are electronically filed with, or furnished to, the SEC. In addition to its reports filed or furnished with the SEC, the Company publicly discloses material information from time to time in its press releases, at annual meetings of Shareholders, in publicly accessible conferences and Investor presentations, and through its website (principally in its Press Room and Investor Relations pages).

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DISCLOSURE REGARDING FORWARD-LOOKING INFORMATION

This Form 10-K contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward-looking statements are based on, and include statements about, the Company’s estimates, expectations, beliefs, intentions, and strategies for the future, and the assumptions underlying these forward-looking statements. Specific forward-looking statements can be identified by the fact that they do not relate strictly to historical or current facts and include, without limitation, words such as “anticipates,” “believes,” “estimates,” “expects,” “intends,” “may,” “will,” “should,” and similar expressions. Although management believes these forward-looking statements are reasonable as and when made, forward-looking statements are not guarantees of future performance and involve risks and uncertainties that are difficult to predict. Therefore, actual results may differ materially from what is expressed in or indicated by the Company’s forward-looking statements or from historical experience or the Company’s present expectations. Known material risk factors that could cause these differences are set forth below under “Risk Factors.” Additional risks or uncertainties (i) that are not currently known to the Company, (ii) that the Company currently deems to be immaterial, or (iii) that could apply to any company, could also materially adversely affect the Company’s business, financial condition, or future results.

Caution should be taken not to place undue reliance on the Company’s forward-looking statements, which represent the Company’s views only as of the date this report is filed. The Company undertakes no obligation to update publicly or revise any forward-looking statement, whether as a result of new information, future events, or otherwise.

Item 1A.Risk Factors

The airline industry is particularly sensitive to changes in economic conditions; in the event of unfavorable economic conditions or economic uncertainty, the Company’s results of operations could be negatively affected, which could require the Company to adjust its business strategies.

The airline industry, which is subject to relatively high fixed costs and highly variable and unpredictable demand, is particularly sensitive to changes in economic conditions. Historically, unfavorable U.S. economic conditions have driven changes in travel patterns and have resulted in reduced spending for both leisure and business travel. For some consumers, leisure travel is a discretionary expense, and short-haul travelers, in particular, have the option to replace air travel with surface travel. Businesses are able to forego air travel by using communication alternatives such as videoconferencing and the Internet or may be more likely to purchase less expensive tickets to reduce costs, which can result in a decrease in average revenue per seat. Unfavorable economic conditions have also historically hampered the ability of airlines to raise fares to counteract any increases in fuel, labor, and other costs. Although the U.S. economy has experienced moderate economic growth over the course of the past three years, any continuing or future U.S. or global economic uncertainty could negatively affect the Company’s results of operations and could cause the Company to adjust its business strategies.

The Company’s business can be significantly impacted by high and/or volatile fuel prices, and the Company’s operations are subject to disruption in the event of any delayed supply of fuel; therefore, the Company’s strategic plans and future profitability are likely to be impacted by the Company’s ability to effectively address fuel price increases and fuel price volatility and availability.

Airlines are inherently dependent upon energy to operate, and jet fuel and oil represented approximately 23 percent of the Company’s operating expenses for 2015. Although 2015 fuel prices were lower than in 2014, and dropped significantly beginning in the second half of 2014, the cost of fuel continues to be volatile and unpredictable, and even a small change in market fuel prices can significantly affect profitability. Furthermore, volatility in fuel prices can be due to many external factors that are beyond the Company’s control. For example, fuel prices can be impacted by political and economic factors, such as (i) dependency on foreign imports of crude oil and the potential for hostilities or other conflicts in oil producing areas; (ii) limited domestic refining or pipeline capacity; (iii) worldwide demand for fuel, particularly in developing countries, which can result in inflated energy prices; (iv) changes in U.S. governmental policies on fuel production, transportation, taxes, and marketing; and (v) changes in currency exchange rates.

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If higher fuel prices were to return, the Company’s ability to effectively address fuel price increases could be limited by its ability to increase fares, which can be difficult in challenging economic environments when low fares are often used to stimulate traffic. The Company's ability to increase fares can also be limited by factors such as its historical low-fare reputation, the portion of its Customer base that purchases travel for leisure purposes, the competitive nature of the airline industry generally, and the risk that higher fares will drive a decrease in demand.

The Company attempts to manage its risk associated with volatile jet fuel prices by utilizing over-the-counter fuel derivative instruments to hedge a portion of its future jet fuel purchases. However, as evidenced by the extreme decline in jet fuel prices during the fourth quarter of 2014 and early 2015, and again in late 2015, energy prices can fluctuate significantly in a relatively short amount of time. Because the Company uses a variety of different derivative instruments at different price points, the Company is subject to the risk that the fuel derivatives it uses will not provide adequate protection against significant increases in fuel prices and could in fact result in additional volatility in the Company’s earnings. The Company is also subject to the risk that additional cash collateral may be required to be posted to fuel hedge counterparties, which could have a significant impact on the Company’s financial position and liquidity.

In addition, the Company is subject to the risk that its fuel derivatives will not be effective or that they will no longer qualify for hedge accounting under applicable accounting standards, which can create additional earnings volatility. Adjustments in the Company’s overall fuel hedging strategy, as well as the ability of the commodities used in fuel hedging to qualify for special hedge accounting, are likely to continue to affect the Company’s results of operations. In addition, there can be no assurance that the Company will be able to cost-effectively hedge against increases in fuel prices.

The Company’s fuel hedging arrangements and the various potential impacts of hedge accounting on the Company’s financial position, cash flows, and results of operations are discussed in more detail under “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” “Quantitative and Qualitative Disclosures About Market Risk,” and in Note 1 and Note 10 to the Consolidated Financial Statements.

The Company is also reliant upon the readily available supply and timely delivery of jet fuel to the airports that it serves. A disruption in that supply could present significant challenges to the Company’s operations and could ultimately cause the cancellation of flights and/or the inability of the Company to provide service to a particular airport.

The Company’s low-cost structure has historically been one of its primary competitive advantages, and many factors have affected and could continue to affect the Company’s ability to control its costs.

The Company’s low-cost structure has historically been one of its primary competitive advantages, as it has enabled it to offer low fares, drive traffic volume, and grow market share. The Company has limited control over fuel and labor costs, as well as other costs such as regulatory compliance costs. Jet fuel and oil constituted approximately 23 percent of the Company’s operating expenses during 2015, and the cost of fuel is subject to the external factors discussed in the second Risk Factor above. Salaries, wages, and benefits constituted approximately 41 percent of the Company’s operating expenses during 2015. The Company’s ability to control labor costs is limited by the terms of its collective-bargaining agreements, and increased labor costs have negatively impacted the Company’s low-cost competitive position. As discussed further under “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” the Company’s unionized workforce, which makes up the majority of its Employees, has had pay scale increases as a result of contractual rate increases. Furthermore, as indicated above under “Business - Employees,” the majority of Southwest’s unionized Employees, including its Pilots; Mechanics; Ramp, Operations, Provisioning, and Freight Agents; Flight Attendants; Material Specialists; Facilities Maintenance Technicians; Flight Crew Training Instructors; and Source of Support Representatives, are in unions currently in negotiations for labor agreements, which could continue to put pressure on the Company’s labor costs. As discussed above under “Business - Regulation,” the airline industry is heavily regulated, and the Company’s regulatory compliance costs are subject to potentially significant increases from time to time based on actions by the regulatory agencies. Additionally, when other airlines reduce their capacity, airport costs are then allocated among a fewer number of total flights, which can result in increased landing fees and other costs for the Company. The Company is also reliant upon third party vendors and service providers, and its low-cost advantage is also dependent in part on its ability to obtain and maintain commercially reasonable terms with those parties.

As discussed above under “Business - Insurance,” the Company carries insurance of types customary in the airline industry and, in the past, has also been provided supplemental, first-party, war-risk insurance coverage by the federal

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government. Since the government-provided supplemental coverage from the Wartime Act was set to expire on September 30, 2014, the Company proactively canceled its government provided war-risk insurance coverage prior to that date and purchased comparable coverage via the commercial insurance marketplace. Although the Company was able to purchase comparable coverage via the commercial insurance marketplace, available commercial insurance in the future could be more expensive and/or have material differences in coverage than is currently provided and may not be adequate to protect against the Company's risk of loss from future acts of terrorism. In addition, an accident or other incident involving Southwest aircraft could result in costs in excess of its related insurance coverage, which costs could be substantial. Any aircraft accident or other incident, even if fully insured, could also have a material adverse effect on the public’s perception of the Company.

The Company cannot guarantee it will be able to maintain or improve upon its current level of low-cost advantage over many of its airline competitors. Some of the Company’s competitors have achieved lower employee pay scales through bankruptcy. Further, some competitors have continued to grow their fleets and expand their networks, potentially enabling them to better control costs per available seat mile. In addition, like Southwest, some competitors have plans to add a significant number of new aircraft to their fleets, which could potentially decrease their operating costs through better fuel efficiencies, and lower maintenance costs. Some of the Company’s competitors have taken advantage of reorganization in bankruptcy, and even the threat of bankruptcy, not only to lower employee pay scales, but also to decrease operating costs through renegotiated supply and financing agreements. In addition, some airlines have consolidated and reported significant cost synergies.

The Company is increasingly dependent on technology to operate its business and continues to implement substantial changes to its information systems; any failure, disruption, or breach in the Company’s information systems could materially adversely affect its operations.

The Company is increasingly dependent on the use of complex technology and systems to run its ongoing operations. In recent years the Company has been committed to technology improvements to support its ongoing operations and initiatives and, as discussed above under “Business - Technology Initiatives,” the Company has invested in significant technology changes. The Company is in the midst of a multi-year project to completely replace its reservation system. In 2014, the Company launched the Amadeus Altéa reservations solution to support the Company’s international service. The Company has since begun implementing Amadeus' Altéa reservations solution as the Company's future single reservation system for both domestic and international reservations. This single reservation system is expected to be implemented in 2017. The Company intends to continue to devote significant technology resources towards, among other things, (i) the continued development of systems to improve both revenue management and network optimization capabilities, (ii) the aforementioned replacement of Southwest's existing domestic reservation system with the comprehensive Amadeus' Altéa reservations solution, and (iii) tools to improve operational management.

Integration of complex systems and technology presents significant challenges in terms of costs, human resources, and development of effective internal controls. Integration also presents the risk of operational or security inadequacy or interruption, which could materially affect the Company’s ability to effectively operate its business. The Company is also reliant upon third party performance for timely and effective completion of many of its technology initiatives.

In the ordinary course of business, the Company’s systems will continue to require modification and refinements to address growth and changing business requirements, including requirements related to international operations. In addition, the Company’s systems may require modification to enable the Company to comply with changing regulatory requirements. Modifications and refinements to the Company’s systems have been and are expected to continue to be expensive to implement and may divert management’s attention from other matters. In addition, the Company’s operations could be adversely affected, or it could face imposition of regulatory penalties, if it were unable to timely or effectively modify its systems as necessary.

The Company may occasionally experience system interruptions and delays that make its websites and services unavailable or slow to respond, which could prevent the Company from efficiently processing Customer transactions or providing services. This in turn could reduce the Company’s operating revenues and the attractiveness of its services. The Company’s computer and communications systems and operations could be damaged or interrupted by catastrophic events such as fires, floods, earthquakes, tornadoes and hurricanes, power loss, computer and telecommunications failures, acts of war or terrorism, computer viruses, security breaches, and similar events or disruptions. Any of these events could cause system interruptions, delays, and loss of critical data, and could prevent the Company from

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processing Customer transactions or providing services, which could make the Company’s business and services less attractive and subject the Company to liability. Any of these events could damage the Company’s reputation and be expensive to remedy.

The Company’s business is labor intensive; therefore, the Company would be adversely affected if it were unable to maintain satisfactory relations with its Employees or its Employees’ Representatives or if the Company were unable to employ sufficient numbers of qualified Employees to maintain its operations.

The airline business is labor intensive. Salaries, wages, and benefits represented approximately 41 percent of the Company’s operating expenses for the year ended December 31, 2015. In addition, as of December 31, 2015, approximately 83 percent of the Company’s Employees were represented for collective bargaining purposes by labor unions, making the Company particularly exposed in the event of labor-related job actions. Employment-related issues that may impact the Company’s results of operations, some of which are negotiated items, include hiring/retention rates, pay rates, outsourcing costs, work rules, and health care costs. The Company has historically maintained positive relationships with its Employees and its Employees’ Representatives. However, as indicated above under “Business - Employees,” the majority of Southwest’s unionized Employees, including its Pilots; Mechanics; Ramp, Operations, Provisioning, and Freight Agents; Flight Attendants; Material Specialists; Facilities Maintenance Technicians; Flight Crew Training Instructors; and Source of Support Representatives, are in unions currently in negotiations for labor agreements, which could continue to put pressure on the Company’s labor costs. Increasing labor costs could negatively impact the Company’s competitive position.

The Company’s success also depends on its ability to attract and retain skilled personnel. Competition for skilled personnel may intensify if overall industry capacity increases and/or if high levels of current personnel reach retirement age. The Company may be required to increase existing levels of compensation to retain or supplement its skilled workforce. The inability to recruit and retain skilled personnel or the unexpected loss of key skilled personnel could adversely affect the Company’s operations.

The Company is currently dependent on single aircraft and engine suppliers, as well as single suppliers of certain other parts; therefore, the Company would be materially adversely affected if it were unable to obtain additional equipment or support from any of these suppliers or in the event of a mechanical or regulatory issue associated with their equipment.

The Company is dependent on Boeing as its sole supplier for aircraft and many of its aircraft parts and is dependent on other suppliers for certain other aircraft parts. Although the Company is able to purchase some aircraft from parties other than Boeing, most of its purchases are directly from Boeing. Therefore, if the Company were unable to acquire additional aircraft from Boeing, or if Boeing were unable or unwilling to make timely deliveries of aircraft or to provide adequate support for its products, the Company’s operations would be materially adversely affected. In addition, the Company would be materially adversely affected in the event of a mechanical or regulatory issue associated with the Boeing 737 aircraft type, whether as a result of downtime for part or all of the Company’s fleet, increased maintenance costs, or because of a negative perception by the flying public. The Company believes, however, that its years of experience with the Boeing 737 aircraft type, as well as the efficiencies Southwest has historically achieved by operating with a single aircraft type, outweigh the risks associated with its single aircraft supplier strategy. The Company is also dependent on sole suppliers for aircraft engines and certain other aircraft parts and would therefore also be materially adversely affected in the event of the unavailability of, or a mechanical or regulatory issue associated with, engines and other parts.

Any failure of the Company to maintain the security of certain Customer-related information could result in damage to the Company’s reputation and could be costly to remediate.

The Company must receive information related to its Customers in order to run its business, and the Company’s online operations depend upon the secure transmission of information over public networks, including information permitting cashless payments. This information is subject to the risk of intrusion, tampering, and theft. Although the Company maintains systems to defend against this from occurring, these systems require ongoing monitoring and updating as technologies change, and security could be compromised, confidential information could be misappropriated, or system disruptions could occur. In the ordinary course of its business, the Company provides certain confidential, proprietary, and personal information to third parties. While the Company seeks to obtain assurances that these third parties will protect this information, there is a risk the confidentiality of data held by third parties could be breached. A compromise

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of the Company’s security systems could adversely affect the Company’s reputation and disrupt its operations and could also result in litigation against the Company or the imposition of penalties. In addition, it could be costly to remediate. Although the Company has not experienced cyber incidents that are individually, or in the aggregate, material, the Company has experienced cyber attacks in the past, which have thus far been mitigated by preventative, detective, and responsive measures put in place by the Company.

The Company’s results of operations could be adversely impacted if it is unable to grow or to effectively execute its strategic plans.

Southwest has historically been regarded as a growth airline. However, organic growth remains challenging because (i) the opportunities for domestic expansion could be limited; (ii) the Company's international network is small and not yet developed; and (iii) the Company has faced an increased presence of other low-cost, low-fare carriers. As a result, the Company is reliant on the success of its revenue strategies to help offset certain increasing costs and to continue to improve Customer Service. The timely and effective execution of the Company's strategic plans could be negatively affected by (i) the Company’s ability to timely and effectively implement, transition, and maintain related information technology systems and infrastructure; (ii) the Company’s ability to effectively balance its investment of incremental operating expenses and capital expenditures related to its strategies against the need to effectively control costs; and (iii) the Company’s dependence on third parties with respect to its strategic plans.

Instability of credit, capital, and energy markets can result in pressure on the Company’s credit ratings and can also negatively affect the Company’s ability to obtain financing on acceptable terms and the Company’s liquidity generally.

While the Company’s credit rating is “investment grade,” factors such as future unfavorable economic conditions, a significant decline in demand for air travel, or instability of the credit, capital, and energy markets could result in future pressure on credit ratings, which could negatively affect (i) the Company’s ability to obtain financing on acceptable terms, (ii) the Company’s liquidity generally, and (iii) the availability and cost of insurance. A credit rating downgrade could subject the Company to credit rating triggers related to its credit card transaction processing agreements, the pricing related to any funds drawn under its revolving credit facility, and some of its hedging counterparty agreements. The potential effect of credit rating downgrades is discussed in more detail below under “Quantitative and Qualitative Disclosures About Market Risk.”

The airline industry has faced on-going security concerns and related cost burdens; further threatened or actual terrorist attacks, or other hostilities, could significantly harm the airline industry and the Company’s operations.

Terrorist attacks, actual and threatened, have from time to time materially adversely affected the demand for air travel and also have resulted in increased safety and security costs for the Company and the airline industry generally. Safety measures create delays and inconveniences and can, in particular, reduce the Company’s competitiveness against surface transportation for short-haul routes. Additional terrorist 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 further significant negative impact on the Company and the airline industry.

Airport capacity constraints and air traffic control inefficiencies could limit the Company’s growth; changes in or additional governmental regulation could increase the Company’s operating costs or otherwise limit the Company’s ability to conduct business.

Almost all commercial service airports are owned and/or operated by units of local or state governments. Airlines are largely dependent on these governmental entities to provide adequate airport facilities and capacity at an affordable cost. Similarly, the federal government singularly controls all U.S. airspace, and airlines are completely dependent on the FAA operating that airspace in a safe and efficient manner. The air traffic control system, which is operated by the FAA, could continue to face airspace and/or airport congestion challenges in the future, which could limit the Company’s opportunities for growth. As discussed above under “Business - Regulation,” airlines are also subject to other extensive regulatory requirements. These requirements often impose substantial costs on airlines. The Company’s strategic plans and results of operations could be negatively affected by changes in law and future actions taken by domestic and foreign governmental agencies having jurisdiction over its operations, including, but not limited to:

• increases in airport rates and charges;

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• limitations on airport gate capacity or use of other airport facilities;

• limitations on route authorities;

• actions and decisions that create difficulties in obtaining access at slot-controlled airports;

• actions and decisions that create difficulties in obtaining operating permits and approvals;

• changes to environmental regulations;

• new or increased taxes or fees;

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

• restrictions on competitive practices;

• changes in laws that increase costs for safety, security, compliance, or other Customer Service standards;

• changes in laws that may limit the Company's ability to enter into fuel derivative contracts to hedge against increases in fuel prices;

• changes in laws that may limit or regulate the Company’s ability to promote the Company’s business or fares; and

• the adoption of more restrictive locally-imposed noise regulations.

Because expenses of a flight do not vary significantly with the number of passengers carried, a relatively small change in the number of passengers can have a disproportionate effect on an airline’s operating and financial results. Therefore, any general reduction in airline passenger traffic as a result of any of the factors listed above could adversely affect the Company’s results of operations. In addition, in instances where the airline industry shrinks, many airport operating costs are essentially unchanged and must be shared by the remaining operating carriers, which can therefore increase the Company’s costs.

The airline industry is affected by many conditions that are beyond its control, which can impact the Company’s business strategies and results of operations.

In addition to the unpredictable economic conditions and fuel costs discussed above, the Company, like the airline industry in general, is affected by conditions that are largely unforeseeable and outside of its control, including, among others:

• adverse weather and natural disasters;

• outbreaks of disease;

• changes in consumer preferences, perceptions, spending patterns, or demographic trends (including, without limitation, changes in government travel patterns due to government shutdowns or sequestration);

• actual or potential disruptions in the air traffic control system (including, without limitation, as a result of potential FAA budget cuts due to government shutdowns or sequestration);

• changes in the competitive environment due to industry consolidation, industry bankruptcies, and other factors;

• air traffic congestion and other air traffic control issues; and

• actual or threatened war, terrorist attacks, and political instability.

The airline industry is intensely competitive.

As discussed in more detail above under “Business - Competition,” the airline industry is intensely competitive. The Company’s primary competitors include other major domestic airlines, as well as regional and new entrant airlines, surface transportation, and alternatives to transportation such as videoconferencing and the Internet. The Company’s revenues are sensitive to the actions of other carriers with respect to pricing, routes, frequent flyer programs, scheduling, capacity, Customer Service, comfort and amenities, cost structure, aircraft fleet, and code-sharing and similar activities.

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The Company’s future results will suffer if it does not effectively manage its expanded operations, including its international operations.

As the Company expands its international flight offerings, the U.S. Customs and Border Protection (“CBP”) will become an increasingly important federal agency. CBP personnel and CBP-mandated procedures can affect the Company’s operations, costs, and Customer experience. The Company has made, and is continuing to make, significant investments in facilities, equipment, and technologies at certain airports in order to improve the Customer experience and to assist CBP with its inspection and processing duties; however, the Company is not able to predict the impact, if any, that various CBP measures or the lack of CBP resources will have on Company revenues and costs, either in the short-term or the long-term.

International flying requires the Company to modify certain processes, as the airport environment is dramatically different in certain international locations with respect to, among other things, common-use ticket counters and gate areas, local operating requirements, and cultural preferences. In addition, international flying exposes the Company to certain foreign currency risks to the extent the Company chooses to, or is required to, transact in currencies other than the U.S. dollar. To the extent the Company seeks to serve additional foreign destinations in the future, or to renew its authority to serve certain routes, it may be required to obtain necessary authority from the DOT and/or approvals from the FAA, as well as any applicable foreign government entity.

The Company’s expansion of its operations into non-U.S. jurisdictions also expands the scope of the laws to which the Company is subject, both domestically and internationally. In addition, operations in non-U.S. jurisdictions are in many cases subject to the laws of those jurisdictions rather than U.S. laws. Laws in some jurisdictions differ in significant respects from those in the United States, and these differences can affect the Company’s ability to react to changes in its business, and its rights or ability to enforce rights may be different than would be expected under U.S. laws. Furthermore, enforcement of laws in some jurisdictions can be inconsistent and unpredictable, which can affect both the Company’s ability to enforce its rights and to undertake activities that it believes are beneficial to its business. As a result, the Company’s ability to generate revenue and its expenses in non-U.S. jurisdictions may differ from what would be expected if U.S. laws governed these operations. Although the Company has policies and procedures in place that are designed to promote compliance with the laws of the jurisdictions in which it operates, a violation by the Company’s Employees, contractors, or agents or other intermediaries, could nonetheless occur. Any violation (or alleged or perceived violation), even if prohibited by the Company’s policies, could have an adverse effect on the Company’s reputation and/or its results of operations.

The Company is currently subject to pending litigation, and if judgment were to be rendered against the Company in the litigation, such judgment could adversely affect the Company’s operating results.

 A complaint alleging violations of federal antitrust laws and seeking certification as a class action was filed against Delta Air Lines, Inc. and AirTran in the United States District Court for the Northern District of Georgia in Atlanta on May 22, 2009. The complaint alleged, among other things, that AirTran attempted to monopolize air travel in violation of Section 2 of the Sherman Act, and conspired with Delta in imposing $15-per-bag fees for the first item of checked luggage in violation of Section 1 of the Sherman Act. The initial complaint sought treble damages on behalf of a putative class of persons or entities in the United States who directly paid Delta and/or AirTran such fees on domestic flights beginning December 5, 2008. After the filing of the May 2009 complaint, various other nearly identical complaints also seeking certification as class actions were filed in federal district courts in Atlanta, Georgia; Orlando, Florida; and Las Vegas, Nevada. All of the cases were consolidated before a single federal district court judge in Atlanta. A Consolidated Amended Complaint was filed in the consolidated action on February 1, 2010, which broadened the allegations to add claims that Delta and AirTran conspired to reduce capacity on competitive routes and to raise prices in violation of Section 1 of the Sherman Act. In addition to treble damages for the amount of first baggage fees paid to AirTran and to Delta, the Consolidated Amended Complaint seeks injunctive relief against a broad range of alleged anticompetitive activities, as well as attorneys' fees. On August 2, 2010, the Court dismissed plaintiffs' claims that AirTran and Delta had violated Section 2 of the Sherman Act; the Court let stand the claims of a conspiracy with respect to the imposition of a first bag fee and the airlines' capacity and pricing decisions. On June 30, 2010, the plaintiffs filed a motion to certify a class, which AirTran and Delta have opposed. The parties have submitted briefs on class certification, and the parties have filed motions to exclude the class certification opinions of each other’s expert. The parties engaged in extensive discovery, and discovery has now closed. On June 18, 2012, the parties filed a Stipulation and Order that plaintiffs have abandoned their claim that AirTran and Delta conspired to reduce capacity.

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On August 31, 2012, AirTran and Delta moved for summary judgment on all of plaintiffs' remaining claims, but discovery disputes between plaintiffs and Delta delayed further briefing on summary judgment. On August 5, 2015, the Court entered an order granting class certification, which was vacated on August 17, 2015, to permit further briefing on class certification and AirTran’s motion to exclude plaintiffs’ expert. Thereafter, the parties filed motions to exclude the opinions of the other parties’ experts. On January 8, 2016, the parties completed briefing on defendants’ motions for summary judgment, plaintiffs’ motion for class certification, and the motions to exclude the opinions of experts, and those motions have been submitted to the Court for decision. While AirTran has denied all allegations of wrongdoing, including those in the Consolidated Amended Complaint, and intends to defend vigorously any and all such allegations, results of legal proceedings such as this one cannot be predicted with certainty.

Also, on June 30, 2015, the U.S. Department of Justice (“DOJ”) issued a Civil Investigative Demand (“CID”) to the Company. The CID seeks information and documents about the Company’s capacity from January 2010 to the present including public statements and communications with third parties about capacity. In June 2015, the Company also received a letter from the Connecticut Attorney General requesting information about capacity; and on August 21, 2015, the Attorney General of the State of Ohio issued an investigative demand seeking information and documents about the Company’s capacity from December 2013 to the present. The Company is cooperating fully with the DOJ CID and these two state inquiries.

Further, on July 1, 2015, a complaint was filed in the United States District Court for the Southern District of New York on behalf of putative classes of consumers alleging collusion among the Company, American Airlines, Delta Air Lines, and United Airlines to limit capacity and maintain higher fares in violation of Section 1 of the Sherman Act. Since then, a number of similar class action complaints have been filed in the United States District Courts for the Central District of California, the Northern District of California, the District of Columbia, the Middle District of Florida, the Southern District of Florida, the Northern District of Georgia, the Northern District of Illinois, the Southern District of Indiana, the Eastern District of Louisiana, the District of Minnesota, the District of New Jersey, the Eastern District of New York, the Southern District of New York, the Middle District of North Carolina, the District of Oklahoma, the Eastern District of Pennsylvania, the Northern District of Texas, the District of Vermont, and the Eastern District of Wisconsin. The complaints seek treble damages for periods that vary among the complaints, costs, attorneys’ fees, and injunctive relief. On October 13, 2015, the Judicial Panel on Multi-District Litigation centralized the cases to the United States District Court in the District of Columbia. The Court has not yet entered a scheduling order establishing a date for defendants to respond to the complaints. While the Company intends to vigorously defend these civil cases, results of legal proceedings such as this one cannot be predicted with certainty.

In addition, on July 8, 2015, the Company was named as a defendant in putative class action filed in British Columbia, Canada alleging that the Company, Air Canada, American Airlines, Delta Air Lines and United Airlines colluded to restrict capacity and maintain higher fares for Canadian citizens traveling in the United States and for travel between the United States and Canada. Similar lawsuits were filed in Ontario, Quebec and Saskatchewan. The time for the Company to respond to the complaints has not yet expired. While the Company intends to vigorously defend these civil cases, results of legal proceedings such as this one cannot be predicted with certainty.

Regardless of merit, these litigation matters and any potential future claims against the Company or AirTran may be both time consuming and disruptive to the Company’s operations and cause significant expense and diversion of management attention. Should AirTran and the Company fail to prevail in these or other matters, the Company may be faced with significant monetary damages or injunctive relief that could materially adversely affect its business and might materially affect its financial condition and operating results.

The application of the acquisition method of accounting resulted in the Company recording a significant amount of goodwill in connection with the acquisition of AirTran, which could result in significant future impairment charges and negatively affect the Company’s financial results.

The Company recorded goodwill on its Consolidated Balance Sheet as a result of its acquisition of AirTran. Goodwill is not amortized, but is tested for impairment at least annually. Future impairment of Goodwill could be recorded in the Company's results of operations as a result of changes in assumptions, estimates, or circumstances, some of which are beyond the Company’s control. Factors which could result in an impairment, holding other assumptions constant, could include, but are not limited to: (i) reduced passenger demand as a result of domestic or global economic conditions; (ii) significantly higher prices for jet fuel; (iii) lower fares or passenger yields as a result of increased competition or

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lower demand; (iv) a significant increase in future capital expenditure commitments; and (v) significant disruptions to the Company’s operations as a result of both internal and external events such as terrorist activities, actual or threatened war, labor actions by Employees, or further industry regulation. The Company can provide no assurance that a significant impairment charge will not occur in one or more future periods. Any such charges may materially negatively affect the Company’s financial results. See Note 1 to the Consolidated Financial Statements for further information.

Item 1B.    Unresolved Staff Comments

None.

Item 2.        Properties

Aircraft

Southwest operated a total of 704 Boeing 737 aircraft as of December 31, 2015, of which 95 and 28 were under operating and capital leases, respectively. The following table details information on the 704 aircraft as of December 31, 2015:

Type	Seats	Average Age (Yrs)	Number of Aircraft	Number Owned (a)	Number Leased
737-300 (b)	137 or 143	22	118	78	40
737-500	122	24	11	9	2
737-700	143	11	471	397	74
737-800	175	2	104	97	7
Totals		12	704	581	123

(a) As discussed further in Note 6to the Consolidated Financial Statements, 181 of the Company's aircraft were pledged as collateral as of December 31, 2015, for secured borrowings and/or in the case that the Company has obligations related to its fuel derivative instruments with counterparties that exceed certain thresholds.

(b) Of the total, 78 737-300 aircraft had 143 seats and 40 have 137 seats.

As of December 31, 2015, the Company had firm deliveries and options for Boeing 737-700, 737-800, 737 MAX 7, and 737 MAX 8 aircraft as follows:

	The Boeing Company 737 NG				The Boeing Company 737 MAX
	-800 Firm Orders	Options	Additional -700 A/C		-7 Firm Orders	-8 Firm Orders		Options	Total
2016	36	—	17		—	—		—	53
2017	35	—	14		—	14		—	63
2018	18	18	4		—	13		—	53
2019	—	—	—		15	10		—	25
2020	—	—	—		14	22		—	36
2021	—	—	—		1	33		18	52
2022	—	—	—		—	30		19	49
2023	—	—	—		—	24		23	47
2024	—	—	—		—	24		23	47
2025	—	—	—		—	—		36	36
2026	—	—	—		—	—		36	36
2027	—	—	—		—	—		36	36
Total	89	18	35	(b)	30	170	(a)	191	533

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(a) The Company has flexibility to substitute MAX 7 in lieu of MAX 8 firm orders beginning in 2019.

(b) To be acquired in leases from various third parties.

Ground Facilities and Services

Southwest either leases or pays a usage fee for terminal passenger service facilities at each of the airports it serves, to which various leasehold improvements have been made. The Company leases the land and/or structures on a long-term basis for its aircraft maintenance centers (located at Dallas Love Field, Houston Hobby, Phoenix Sky Harbor, Chicago Midway, Hartsfield-Jackson Atlanta International Airport and Orlando International Airport), its flight training center at Dallas Love Field (which houses ten 737 simulators), and its main corporate headquarters building, also located at Dallas Love Field. The Company also leases a warehouse and engine repair facility in Atlanta. The Company owns an energy-efficient, modern building designed to house certain operational and training functions, including its 24-hour operations. This additional headquarters building is located across the street from the Company’s current headquarters building on land owned by the Company.

The Company’s international expansion in 2015 was facilitated by the completion of construction of a new five-gate international terminal at Houston’s William P. Hobby Airport with international passenger processing facilities, an expanded security checkpoint, and an upgraded Southwest ticketing area. The Company controlled this expansion and related financial terms pursuant to an Airport Use and Lease Agreement with the City of Houston. Additional information regarding this project is provided below under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 4 to the Consolidated Financial Statements.

Pursuant to an agreement with Broward County, Florida, which owns and operates Fort Lauderdale-Hollywood International Airport, the Company is also overseeing and managing the design and construction of the airport’s Terminal 1 Modernization Project. In addition to significant improvements to the existing Terminal 1, the project includes the design and construction of a new five-gate Concourse A with an international processing facility. Major construction on the project began during third quarter 2015 and is estimated to be completed during 2017. Additional information regarding this project is provided below under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 4 to the Consolidated Financial Statements.

Pursuant to a lease agreement with Los Angeles World Airports, which owns and operates Los Angeles International Airport, the Company is also overseeing and managing the design, development, financing, construction, and commissioning of the airport's Terminal 1 Modernization Project. Construction on the project began during fourth quarter 2014 and is estimated to be completed during 2018. Additional information regarding this project is provided below under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 4 to the Consolidated Financial Statements.

The Company also managed the reconstruction of Dallas Love Field with modern, convenient air travel facilities (“Love Field Modernization Program”). The project consisted of the complete replacement of gate facilities with a new 20-gate facility, including infrastructure, systems and equipment, aircraft parking apron, fueling system, roadways and terminal curbside, baggage handling systems, passenger loading bridges and support systems, and other supporting infrastructure. The Love Field Modernization Program is discussed in more detail below under “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in Note 4 to the Consolidated Financial Statements.

As of December 31, 2015, the Company operated seven Customer Support and Services call centers. The centers located in Atlanta, San Antonio, Chicago, Albuquerque, and Oklahoma City occupy leased space. The Company owns its Houston and Phoenix centers.

The Company performs substantially all line maintenance on its aircraft and provides ground support services at most of the airports it serves. However, the Company has arrangements with certain aircraft maintenance firms for major component inspections and repairs for its airframes and engines, which comprise the majority of the Company’s annual aircraft maintenance costs.

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Item 3. Legal Proceedings

A complaint alleging violations of federal antitrust laws and seeking certification as a class action was filed against Delta Air Lines, Inc. and AirTran in the United States District Court for the Northern District of Georgia in Atlanta on May 22, 2009. The complaint alleged, among other things, that AirTran attempted to monopolize air travel in violation of Section 2 of the Sherman Act, and conspired with Delta in imposing $15-per-bag fees for the first item of checked luggage in violation of Section 1 of the Sherman Act. The initial complaint sought treble damages on behalf of a putative class of persons or entities in the United States who directly paid Delta and/or AirTran such fees on domestic flights beginning December 5, 2008. After the filing of the May 2009 complaint, various other nearly identical complaints also seeking certification as class actions were filed in federal district courts in Atlanta, Georgia; Orlando, Florida; and Las Vegas, Nevada. All of the cases were consolidated before a single federal district court judge in Atlanta. A Consolidated Amended Complaint was filed in the consolidated action on February 1, 2010, which broadened the allegations to add claims that Delta and AirTran conspired to reduce capacity on competitive routes and to raise prices in violation of Section 1 of the Sherman Act. In addition to treble damages for the amount of first baggage fees paid to AirTran and to Delta, the Consolidated Amended Complaint seeks injunctive relief against a broad range of alleged anticompetitive activities, as well as attorneys' fees. On August 2, 2010, the Court dismissed plaintiffs' claims that AirTran and Delta had violated Section 2 of the Sherman Act; the Court let stand the claims of a conspiracy with respect to the imposition of a first bag fee and the airlines' capacity and pricing decisions. On June 30, 2010, the plaintiffs filed a motion to certify a class, which AirTran and Delta have opposed. The parties have submitted briefs on class certification, and the parties have filed motions to exclude the class certification opinions of each other’s expert. The parties engaged in extensive discovery, and discovery has now closed. On June 18, 2012, the parties filed a Stipulation and Order that plaintiffs have abandoned their claim that AirTran and Delta conspired to reduce capacity. On August 31, 2012, AirTran and Delta moved for summary judgment on all of plaintiffs' remaining claims, but discovery disputes between plaintiffs and Delta delayed further briefing on summary judgment. On August 5, 2015, the Court entered an order granting class certification, which was vacated on August 17, 2015, to permit further briefing on class certification and AirTran’s motion to exclude plaintiffs’ expert. Thereafter, the parties filed motions to exclude the opinions of the other parties’ experts. On January 8, 2016, the parties completed briefing on defendants’ motions for summary judgment, plaintiffs’ motion for class certification, and the motions to exclude the opinions of experts, and those motions have been submitted to the Court for decision. AirTran denies all allegations of wrongdoing, including those in the Consolidated Amended Complaint, and intends to defend vigorously any and all such allegations.

Also, on June 30, 2015, the U.S. Department of Justice (“DOJ”) issued a Civil Investigative Demand (“CID”) to the Company. The CID seeks information and documents about the Company’s capacity from January 2010 to the present including public statements and communications with third parties about capacity. In June 2015, the Company also received a letter from the Connecticut Attorney General requesting information about capacity; and on August 21, 2015, the Attorney General of the State of Ohio issued an investigative demand seeking information and documents about the Company’s capacity from December 2013 to the present. The Company is cooperating fully with the DOJ CID and these two state inquiries.

Further, on July 1, 2015, a complaint was filed in the United States District Court for the Southern District of New York on behalf of putative classes of consumers alleging collusion among the Company, American Airlines, Delta Air Lines, and United Airlines to limit capacity and maintain higher fares in violation of Section 1 of the Sherman Act. Since then, a number of similar class action complaints have been filed in the United States District Courts for the Central District of California, the Northern District of California, the District of Columbia, the Middle District of Florida, the Southern District of Florida, the Northern District of Georgia, the Northern District of Illinois, the Southern District of Indiana, the Eastern District of Louisiana, the District of Minnesota, the District of New Jersey, the Eastern District of New York, the Southern District of New York, the Middle District of North Carolina, the District of Oklahoma, the Eastern District of Pennsylvania, the Northern District of Texas, the District of Vermont, and the Eastern District of Wisconsin. The complaints seek treble damages for periods that vary among the complaints, costs, attorneys’ fees, and injunctive relief. On October 13, 2015, the Judicial Panel on Multi-District Litigation centralized the cases to the United States District Court in the District of Columbia. The Court has not yet entered a scheduling order establishing a date for defendants to respond to the complaints. The Company intends to vigorously defend these civil cases.

In addition, on July 8, 2015, the Company was named as a defendant in putative class action filed in British Columbia, Canada alleging that the Company, Air Canada, American Airlines, Delta Air Lines and United Airlines colluded to

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restrict capacity and maintain higher fares for Canadian citizens traveling in the United States and for travel between the United States and Canada. Similar lawsuits were filed in Ontario, Quebec and Saskatchewan. The time for the Company to respond to the complaints has not yet expired. The Company intends to vigorously defend these civil cases in Canada.

The Company is from time to time subject to various legal proceedings and claims arising in the ordinary course of business, including, but not limited to, examinations by the Internal Revenue Service.

The Company’s management does not expect that the outcome in any of its currently ongoing legal proceedings or the outcome of any proposed adjustments presented to date by the Internal Revenue Service, individually or collectively, will have a material adverse effect on the Company’s financial condition, results of operations, or cash flow.

Item 4. Mine Safety Disclosures

Not applicable.

EXECUTIVE OFFICERS OF THE REGISTRANT

The following information regarding the Company’s executive officers is as of February 1, 2016.

Name	Position	Age
Gary C. Kelly	Chairman of the Board, President, & Chief Executive Officer	60
Robert E. Jordan	Executive Vice President & Chief Commercial Officer	55
Jeff Lamb	Executive Vice President Corporate Services	53
Thomas M. Nealon	Executive Vice President Strategy & Innovation	54
Tammy Romo	Executive Vice President & Chief Financial Officer	53
Michael G. Van de Ven	Executive Vice President & Chief Operating Officer	54
Mark R. Shaw	Senior Vice President, General Counsel, & Corporate Secretary	53

Set forth below is a description of the background of each of the Company’s executive officers.

Gary C. Kelly has served as the Company’s Chairman of the Board since May 2008, as its President since July 2008, and as its Chief Executive Officer since July 2004. Mr. Kelly also served as Executive Vice President & Chief Financial Officer from June 2001 to July 2004 and Vice President Finance & Chief Financial Officer from 1989 to 2001. Mr. Kelly joined the Company in 1986 as its Controller.

Robert E. Jordan has served as the Company’s Executive Vice President & Chief Commercial Officer since September 2011 and as President of AirTran Airways, Inc. since May 2011. Mr. Jordan also served as Executive Vice President Strategy & Planning from May 2008 to September 2011, Executive Vice President Strategy & Technology from September 2006 to May 2008, Senior Vice President Enterprise Spend Management from August 2004 to September 2006, Vice President Technology from 2002 to 2004, Vice President Purchasing from 2001 to 2002, Controller from 1997 to 2001, Director Revenue Accounting from 1994 to 1997, and Manager Sales Accounting from 1990 to 1994. Mr. Jordan joined the Company in 1988 as a programmer.

Jeff Lamb has served as the Company’s Executive Vice President Corporate Services since July 2015. Mr. Lamb also served as Executive Vice President & Chief People & Administrative Officer from September 2011 to July 2015, Senior Vice President Administration & Chief People Officer from October 2007 to September 2011, Vice President People & Leadership Development from February 2006 to October 2007, and as Senior Director People Development from December 2004 until February 2006.

Thomas M. Nealon has served as the Company’s Executive Vice President Strategy & Innovation since January 2016. Prior to becoming an executive officer of the Company, Mr. Nealon served on the Company’s Board of Directors from December 2010 until November 2015. Mr. Nealon has also served as Group Executive Vice President of J.C. Penney Company, Inc., a retail company, from August 2010 until December 2011. In this role Mr. Nealon was responsible for Strategy, jcp.com, Information Technology, Customer Insights, and Digital Ventures. Mr. Nealon also served as J.C. Penney’s Executive Vice President & Chief Information Officer from September 2006 until August 2010. Prior to

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joining J.C. Penney, Mr. Nealon was a partner with The Feld Group, a provider of information technology consulting services, where he served in a consultant capacity as Senior Vice President & Chief Information Officer for the Company from 2002 to 2006. Mr. Nealon also served as Chief Information Officer for Frito-Lay, a division of PepsiCo, Inc., from 1996 to 2000, and in various software engineering, systems engineering, and management positions for Frito-Lay from 1983 to 1996.

Tammy Romo has served as the Company’s Executive Vice President & Chief Financial Officer since July 2015. Ms. Romo also served as Senior Vice President Finance & Chief Financial Officer from September 2012 to July 2015, Senior Vice President of Planning from February 2010 to September 2012, Vice President of Financial Planning from September 2008 to February 2010, Vice President Controller from February 2006 to August 2008, Vice President Treasurer from September 2004 to February 2006, Senior Director of Investor Relations from March 2002 to September 2004, Director of Investor Relations from December 1994 to March 2002, Manager of Investor Relations from September 1994 to December 1994, and Manager of Financial Reporting from September 1991 to September 1994.

Michael G. Van de Ven has served as the Company’s Executive Vice President & Chief Operating Officer since May 2008. Mr. Van de Ven also served as Chief of Operations from September 2006 to May 2008, Executive Vice President Aircraft Operations from November 2005 through August 2006, Senior Vice President Planning from August 2004 to November 2005, Vice President Financial Planning & Analysis from 2001 to 2004, Senior Director Financial Planning & Analysis from 2000 to 2001, and Director Financial Planning & Analysis from 1997 to 2000. Mr. Van de Ven joined the Company in 1993 as its Director Internal Audit.

Mark R. Shaw has served as the Company’s Senior Vice President, General Counsel, & Corporate Secretary since July 2015. Mr. Shaw also served as Vice President, General Counsel, & Corporate Secretary from February 2013 to July 2015 and as Associate General Counsel - Corporate and Transactions from February 2008 to February 2013. Mr. Shaw joined the Company in 2000 as an Attorney in the General Counsel Department.

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PART II

Item 5.Market for Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

The Company’s common stock is listed on the New York Stock Exchange ("NYSE") and is traded under the symbol “LUV.” The following table shows the high and low prices per share of the Company’s common stock, as reported on the NYSE Composite Tape, and the cash dividends per share declared on the Company’s common stock.

Period	Dividend		High		Low
2015
1st Quarter	$	0.06000	$	47.17	$	38.26
2nd Quarter	0.07500		44.19		33.02
3rd Quarter	0.07500		40.87		31.36
4th Quarter	0.07500		51.34		37.00
2014
1st Quarter	$	0.04000	$	24.17	$	18.78
2nd Quarter	0.06000		27.70		22.35
3rd Quarter	0.06000		35.49		25.86
4th Quarter	0.06000		43.19		28.40

The Company currently intends to continue declaring dividends on a quarterly basis for the foreseeable future; however, the Company’s Board of Directors may elect to alter the timing, amount, and payment of dividends on the basis of operational results, financial condition, cash requirements, future prospects, and other factors deemed relevant by the Board. As of January 29, 2016, there were approximately 13,518 holders of record of the Company’s common stock.

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Stock Performance Graph

The following Performance Graph and related information shall not be deemed “soliciting material” or “filed” with the Securities and Exchange Commission, nor shall such information be incorporated by reference into any future filing under the Securities Act of 1933 or Securities Exchange Act of 1934.

The following graph compares the cumulative total shareholder return on the Company’s common stock over the five-year period ended December 31, 2015, with the cumulative total return during such period of the Standard and Poor’s 500 Stock Index and the NYSE ARCA Airline Index. The comparison assumes $100 was invested on December 31, 2010, in the Company’s common stock and in each of the foregoing indices and assumes reinvestment of dividends. The stock performance shown on the graph below represents historical stock performance and is not necessarily indicative of future stock price performance.

COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN AMONG SOUTHWEST AIRLINES CO., S&P 500 INDEX, AND NYSE ARCA AIRLINE INDEX

	12/31/2010		12/31/2011		12/31/2012		12/31/2013		12/31/2014		12/31/2015
Southwest Airlines Co.	$	100	$	66	$	79	$	147	$	332	$	340
S&P 500	$	100	$	102	$	119	$	156	$	177	$	180
NYSE ARCA Airline	$	100	$	70	$	96	$	152	$	227	$	193

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Issuer Repurchases

Issuer Purchases of Equity Securities (1)
	(a)	(b)				(c)	(d)
						Total number of	Maximum dollar
						shares purchased	value of shares that
	Total number	Average				as part of publicly	may yet be purchased
	of shares	price paid				announced plans	under the plans
Period	purchased	per share				or programs	or programs
October 1, 2015 through   October 31, 2015	—	$	—			—	$	700,000,000
November 1, 2015 through   November 30, 2015	3,213,009	$	—	(2	)	3,213,009	$	700,000,000
December 1, 2015 through   December 31, 2015	—	$	—			—	$	700,000,000
Total	3,213,009					3,213,009

(1) In May 2015, the Company’s Board of Directors authorized the repurchase of up to $1.5 billion of the Company’s common stock. Repurchases are made in accordance with applicable securities laws in open market, private, or in accelerated repurchase transactions from time to time, depending on market conditions, and may be discontinued at any time.

(2) Under an accelerated share repurchase program entered into by the Company with a third party financial institution in third quarter 2015 ("Third Quarter ASR Program"), the Company paid $500 million and received an initial delivery of 9,679,195 shares during third quarter 2015, representing an estimated 75 percent of the shares to be purchased by the Company under the Third Quarter ASR Program based on a volume-weighted average price of $38.74 per share of the Company’s common stock on the New York Stock Exchange during a calculation period between August 3, 2015 and August 20, 2015. Final settlement of this Third Quarter ASR Program occurred in November 2015 and was determined based generally on a discount to the volume-weighted average price per share of the Company's common stock during a calculation period completed in October 2015. Upon settlement, the third party financial institution delivered 3,213,009 additional shares of the Company’s common stock to the Company. In total, the average purchase price per share for the 12,892,204 shares repurchased under the Third Quarter ASR Program, upon completion of the Third Quarter ASR Program in November 2015, was $38.78.

Item 6.         Selected Financial Data

The following financial information, for the five years ended December 31, 2015, has been derived from the Company’s Consolidated Financial Statements. This information should be viewed in conjunction with the Consolidated Financial Statements and related notes thereto included elsewhere herein. This financial information includes the operations of AirTran from the May 2, 2011 acquisition date through the end of AirTran service on December 28, 2014. Any financial information presented prior to May 2, 2011, or after December 28, 2014, includes only the operations of Southwest unless otherwise indicated. The Company provides the operating data below because these statistics are commonly used in the airline industry and, therefore, allow readers to compare the Company’s performance against its results for prior periods, as well as against the performance of the Company’s peers.

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	Year ended December 31,
	2015			2014			2013			2012			2011
Financial Data (in millions, except per share amounts):
Operating revenues	$	19,820		$	18,605		$	17,699		$	17,088		$	15,658
Operating expenses	15,704			16,380			16,421			16,465			14,965
Operating income	4,116			2,225			1,278			623			693
Other expenses (income) net	637			409			69			(62		)	370
Income before taxes	3,479			1,816			1,209			685			323
Provision for income taxes	1,298			680			455			264			145
Net income	$	2,181		$	1,136		$	754		$	421		$	178
Net income per share, basic	$	3.30		$	1.65		$	1.06		$	0.56		$	0.23
Net income per share, diluted	$	3.27		$	1.64		$	1.05		$	0.56		$	0.23
Cash dividends per common share	$	0.2850		$	0.2200		$	0.1300		$	0.0345		$	0.0180
Total assets at period-end (1)	$	21,312		$	19,723		$	19,177		$	18,350		$	17,805
Long-term obligations at period-end	$	2,541		$	2,434		$	2,191		$	2,883		$	3,107
Stockholders’ equity at period-end	$	7,358		$	6,775		$	7,336		$	6,992		$	6,877
Operating Data:
Revenue passengers carried	118,171,211			110,496,912			108,075,976			109,346,509			103,973,759
Enplaned passengers	144,574,882			135,767,188			133,155,030			133,978,100			127,551,012
Revenue passenger miles (RPMs) (000s) (2)	117,499,879			108,035,133			104,348,216			102,874,979			97,582,530
Available seat miles (ASMs) (000s) (3)	140,501,409			131,003,957			130,344,072			128,137,110			120,578,736
Load factor (4)	83.6		%	82.5		%	80.1		%	80.3		%	80.9		%
Average length of passenger haul (miles)	994			978			966			941			939
Average aircraft stage length (miles)	750			721			703			693			679
Trips flown	1,267,358			1,255,502			1,312,785			1,361,558			1,317,977
Seats flown (5)	184,955,094			179,733,055			183,563,527			184,208,891			177,469,069
Seats per trip (6)	145.94			143.16			139.83			135.92			134.65
Average passenger fare (12)	$	154.85		$	159.80		$	154.72		$	147.17		$	141.90
Passenger revenue yield per RPM (cents) (7)(12)	15.57			16.34			16.02			15.64			15.12
Operating revenue per ASM (cents) (8)	13.98			14.20			13.58			13.34			12.99
Passenger revenue per ASM (cents) (9)(12)	13.02			13.48			12.83			12.56			12.24
Operating expenses per ASM (cents) (10)	11.18			12.50			12.60			12.85			12.41
Operating expenses per ASM, excluding fuel (cents)	8.61			8.46			8.18			8.07			7.73
Operating expenses per ASM, excluding fuel and profitsharing (cents)	8.17			8.19			8.01			7.98			7.65
Fuel costs per gallon, including fuel tax	$	1.90		$	2.93		$	3.16		$	3.30		$	3.19
Fuel costs per gallon, including fuel tax, economic	$	2.07		$	2.92		$	3.12		$	3.28		$	3.19
Fuel consumed, in gallons (millions)	1,901			1,801			1,818			1,847			1,764
Active fulltime equivalent Employees	49,583			46,278			44,381			45,861			45,392
Aircraft at end of period (11)	704			665			681			694			698

(1) Historical amounts have been restated to align with current presentation. See Note 1 to the Consolidated Financial Statements for further information.

(2) A revenue passenger mile is one paying passenger flown one mile. Also referred to as “traffic,” which is a measure of demand for a given period.

(3) An available seat mile is one seat (empty or full) flown one mile. Also referred to as “capacity,” which is a measure of the space available to carry passengers in a given period.

(4) Revenue passenger miles divided by available seat miles.

(5) Seats flown is calculated using total number of seats available by aircraft type multiplied by the total trips flown by the same aircraft type during a particular period.

(6) Seats per trip is calculated using seats flown divided by trips flown. Also referred to as “gauge.”

(7) Calculated as passenger revenue divided by revenue passenger miles. Also referred to as “yield,” this is the average cost paid by a paying passenger to fly one mile, which is a measure of revenue production and fares.

(8) Calculated as operating revenues, excluding special items, divided by available seat miles. Also referred to as "RASM" or "operating unit revenues," this is a measure of operating revenue production based on the total available seat miles flown during a particular period. Year ended 2015 RASM excludes a $172 million one-time non-cash special revenue adjustment. Additional information regarding this special item is provided in the Note Regarding Use of Non-GAAP Financial Measures and a reconciliation of revenue excluding special items related to accounting changes in the accompanying pages.

(9) Calculated as passenger revenue divided by available seat miles. Also referred to as “passenger unit revenues,” this is a measure of passenger revenue production based on the total available seat miles flown during a particular period.

(10) Calculated as operating expenses divided by available seat miles. Also referred to as “unit costs” or “cost per available seat mile,” this is the average cost to fly an aircraft seat (empty or full) one mile, which is a measure of cost efficiencies.

(11) Aircraft in the Company's fleet at end of period, less Boeing 717-200s removed from service in preparation for transition out of the fleet.

(12) Refer to Note 1 to the Consolidated Financial Statements for additional information regarding the impact from the July 2015 amended co-branded credit card agreement with Chase Bank USA, N.A.

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Item 7.        Management's Discussion and Analysis of Financial Condition and Results of Operations

Reconciliation of Reported Amounts to Non-GAAP Financial Measures (unaudited) (in millions, except per share and per ASM amounts)

	Year ended December 31,						Percent
	2015			2014			Change
Total operating revenues, as reported	$	19,820		$	18,605
Deduct: Special revenue adjustment	(172		)	—
Operating revenues, Non-GAAP	$	19,648		$	18,605		5.6	%
Fuel and oil expense, unhedged	$	3,362		$	5,321
Add (Deduct): Fuel hedge losses (gains) included in Fuel and oil expense	254			(28		)
Fuel and oil expense, as reported	$	3,616		$	5,293
Add (Deduct): Net impact from fuel contracts	323			(28		)
Fuel and oil expense, non-GAAP	$	3,939		$	5,265		(25.2	)%
Total operating expenses, as reported	$	15,704		$	16,380
Deduct: Union contract bonuses	(334		)	(9		)
Add (Deduct): Reclassification between Fuel and oil and Other (gains) losses, net,   associated with current period settled contracts	72			(4		)
Add (Deduct): Contracts settling in the current period, but for which gains and/or (losses)   have been recognized in a prior period*	251			(24		)
Deduct: Acquisition and integration costs	(39		)	(126		)
Add: Litigation settlement	37			—
Total operating expenses, non-GAAP	$	15,691		$	16,217		(3.2	)%
Operating income, as reported	$	4,116		$	2,225
Deduct: Special revenue adjustment	(172		)	$	—
Add: Union contract bonuses	334			9
Add (Deduct): Reclassification between Fuel and oil and Other (gains) losses, net,   associated with current period settled contracts	(72		)	4
Add (Deduct): Contracts settling in the current period, but for which gains and/or (losses)   have been recognized in a prior period*	(251		)	24
Add: Acquisition and integration costs	39			126
Deduct: Litigation settlement	(37		)	—
Operating income, non-GAAP	$	3,957		$	2,388		65.7	%
Net income, as reported	$	2,181		$	1,136
Deduct: Special revenue adjustment (a)	(108		)	—
Add: Union contract bonuses (a)	210			6
Add: Mark-to-market impact from fuel contracts settling in future periods	373			251
Add (Deduct): Ineffectiveness from fuel hedges settling in future periods	(9		)	5
Add (Deduct): Other net impact of fuel contracts settling in the current or a prior period   (excluding reclassifications)	(251		)	24
Deduct: Income tax impact of fuel contracts	(42		)	(104		)
Add: Acquisition and integration costs (a)	24			79
Deduct: Litigation settlement (a)	(23		)	—
Net income, non-GAAP	$	2,355		$	1,397		68.6	%

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	Year ended December 31,						Percent
	2015			2014			Change
Net income per share, diluted, as reported	$	3.27		$	1.64
Add: Net impact to net income above from fuel contracts divided by dilutive shares (a)	0.06			0.25
Add: Impact of special items (a)	0.19			0.12
Net income per share, diluted, non-GAAP	$	3.52		$	2.01		75.1	%
Operating expenses per ASM (cents)		11.18	¢		12.50	¢
Deduct: Fuel expense divided by ASMs	(2.57		)	(4.04		)
Deduct: Impact of special items	(0.24		)	(0.10		)
Operating expenses per ASM, non-GAAP, excluding fuel and special items (cents)		8.37	¢		8.36	¢	0.1	%

* As a result of prior hedge ineffectiveness and/or contracts marked to market through earnings.

(a) Amounts net of tax.

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Return on Invested Capital (ROIC) (in millions) (unaudited)

	Year Ended			Year Ended			Year Ended
	December 31, 2015			December 31, 2014			December 31, 2013
Operating Income, as reported	$	4,116		$	2,225		$	1,278
Deduct: Special revenue adjustment	(172		)	—			—
Add: Union contract bonuses	334			9			—
Add (Deduct): Net impact from fuel contracts	(323		)	28			84
Add: Acquisition and integration costs	39			126			86
Deduct: Litigation settlement	(37		)	—			—
Operating Income, non-GAAP	3,957			2,388			1,448
Net adjustment for aircraft leases (1)	114			133			143
Adjustment for fuel hedge accounting	(124		)	(62		)	(60		)
Adjusted Operating Income, non-GAAP	$	3,947		$	2,459		$	1,531
Average invested capital (2)	$	11,037		$	11,470		$	11,664
Equity adjustment for hedge accounting	1,027			104			50
Adjusted average invested capital	$	12,064		$	11,574		$	11,714
ROIC, pre-tax	32.7		%	21.2		%	13.1		%

(1) Net adjustment related to presumption that all aircraft in fleet are owned (i.e., the impact of eliminating aircraft rent expense and replacing with estimated depreciation expense for those same aircraft).

(2) Average invested capital is an average of the five most recent quarter end balances of debt, net present value of aircraft leases, and equity adjusted for hedge accounting.

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Note Regarding Use of Non-GAAP Financial Measures

The Company's Consolidated Financial Statements are prepared in accordance with accounting principles generally accepted in the United States ("GAAP"). These GAAP financial statements include (i) unrealized non-cash adjustments and reclassifications, which can be significant, as a result of accounting requirements and elections made under accounting pronouncements relating to derivative instruments and hedging and (ii) other charges and benefits the Company believes are not indicative of its ongoing operational performance.

As a result, the Company also provides financial information in this filing that was not prepared in accordance with GAAP and should not be considered as an alternative to the information prepared in accordance with GAAP. The Company provides supplemental non-GAAP financial information, including results that it refers to as "economic," which the Company's management utilizes to evaluate its ongoing financial performance and the Company believes provides greater transparency to investors as supplemental information to its GAAP results. The Company's economic financial results differ from GAAP results in that they only include the actual cash settlements from fuel hedge contracts - all reflected within Fuel and oil expense in the period of settlement. Thus, Fuel and oil expense on an economic basis reflects the Company’s actual net cash outlays for fuel during the applicable period, inclusive of settled fuel derivative contracts. Any net premium costs paid related to option contracts are reflected as a component of Other (gains) losses, net, for both GAAP and non-GAAP (including economic) purposes in the period of contract settlement. The Company believes these economic results provide a better measure of the impact of the Company's fuel hedges on its operating performance and liquidity since they exclude the unrealized, non-cash adjustments and reclassifications that are recorded in GAAP results in accordance with accounting guidance relating to derivative instruments, and they reflect all cash settlements related to fuel derivative contracts within Fuel and oil expense. This enables the Company's management, as well as investors, to consistently assess the Company's operating performance on a year-over-year or quarter-over-quarter basis after considering all efforts in place to manage fuel expense. However, because these measures are not determined in accordance with GAAP, such measures are susceptible to varying calculations and not all companies calculate the measures in the same manner. As a result, the aforementioned measures, as presented, may not be directly comparable to similarly titled measures presented by other companies.

Further information on (i) the Company's fuel hedging program, (ii) the requirements of accounting for derivative instruments, and (iii) the causes of hedge ineffectiveness and/or mark-to-market gains or losses from derivative instruments is included in Note 10 to the Consolidated Financial Statements.

In addition to its “economic” financial measures, as defined above, the Company has also provided other non-GAAP financial measures, including results that it refers to as "excluding special items," as a result of items that the Company believes are not indicative of its ongoing operations. These include a one-time Special revenue adjustment due to the July 2015 amended co-branded credit card agreement (the "Agreement") with Chase Bank USA, N.A. ("Chase") and the resulting change in accounting methodology, expenses associated with the Company’s acquisition and integration of AirTran, a gain resulting from a litigation settlement received in January 2015, and union contract bonuses recorded for certain workgroups. The Company believes that evaluation of its financial performance can be enhanced by a presentation of results that exclude the impact of these items in order to evaluate the results on a comparative basis with results in prior periods that do not include such items and as a basis for evaluating operating results in future periods. As a result of the Company’s acquisition of AirTran, which closed on May 2, 2011, the Company has incurred substantial charges associated with the integration of the two companies. The Company does not expect to incur any further Acquisition and integration costs beyond 2015.

The Company has also provided return on invested capital, which is a non-GAAP financial measure. The Company believes return on invested capital is a meaningful measure because it quantifies how well the Company generates operating income relative to the capital it has invested in its business. Although return on invested capital is commonly used as a measure of capital efficiency, definitions of return on invested capital may differ; therefore, the Company is providing an explanation of its calculation for return on invested capital (before taxes and excluding special items) in the accompanying reconciliation.

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YEAR IN REVIEW

For the 43^rd consecutive year, the Company was profitable, recording GAAP and non-GAAP results for 2015 and 2014 as follows:

	Year ended
(in millions, except per share amounts)	December 31,
GAAP	2015		2014		Percent Change
Operating income	$	4,116	$	2,225	85.0
Net income	$	2,181	$	1,136	92.0
Net income per share, diluted	$	3.27	$	1.64	99.4
Non-GAAP
Operating income	$	3,957	$	2,388	65.7
Net income	$	2,355	$	1,397	68.6
Net income per share, diluted	$	3.52	$	2.01	75.1
See the previous Note Regarding Use of Non-GAAP Financial Measures and the Reconciliation of Reported Amounts to Non-GAAP Financial Measures for additional detail regarding non-GAAP financial measures.

Net income for the year ended December 31, 2015, was a Company record$2.2 billion, or $3.27 per diluted share, a 92.0 percentincrease in Net income year-over-year. This increase primarily was due to a 6.5 percentincrease in Operating revenues, driven by strong demand for low-fare air travel and a 7.2 percent year-over-year capacity growth, and the impact of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. See Note 1 to the Consolidated Financial Statements for further information. Also, Operating expenses decreased 4.1 percent, primarily as a result of lower fuel prices, which more than offset increases in certain cost categories discussed below, including Salaries, Wages, and Benefits expense, which included the Company's record Employee Profitsharing expense of $620 million. Excluding special items in both years, non-GAAP Net income was a record$2.4 billion, or $3.52 per diluted share, a 68.6 percentincrease in non-GAAP Net income year-over-year. Year ended December 31, 2015 Operating income was $4.1 billion and non-GAAP Operating income was $4.0 billion. Both GAAP and non-GAAP annual Operating income results for 2015 were Company records and significantly surpassed the prior year performance.

For the twelve months ended December 31, 2015, the Company's exceptional earnings performance, combined with its actions to prudently manage invested capital, produced a 32.7 percent pre-tax Return on invested capital, excluding special items ("ROIC"). This represented a significant increase compared with the Company's ROIC of 21.2 percent for the twelve months ended December 31, 2014. The increase in ROIC was achieved primarily through successful integration of AirTran, operational and network enhancements, and declining fuel prices.

During 2015, the Company continued to return significant value to its Shareholders. The Company returned a record $1.4 billion to Shareholders through a combined $180 million in dividend payments and $1.2 billion through three separate accelerated share repurchase programs and the buyback of its common shares on the open market. On January 25, 2016, the Company launched a new accelerated share repurchase program by advancing $500 million to a financial institution in a privately negotiated transaction ("First Quarter 2016 ASR Program"). The Company received an initial delivery of shares, representing an estimated 75 percent of the shares to be purchased by the Company under the First Quarter 2016 ASR Program. The specific number of shares that the Company ultimately will repurchase under the First Quarter 2016 ASR Program will be determined based generally on a discount to the volume-weighted average price per share of the Company's common stock during a calculation period to be completed no later than April 2016. The purchase will be recorded as a treasury share purchase for purposes of calculating earnings per share. Subsequent to the launch of the First Quarter 2016 ASR Program, the Company has $200 million remaining under its existing $1.5 billion share repurchase program. See Part II, Item 5 for further information on the Company's share repurchase authorizations.

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Company Overview

Following the Company’s effective completion of the AirTran integration at the end of 2014, one of the Company’s primary areas of focus was on allowing its expanded network to develop, while also improving the reliability of its operations. Throughout most of 2015, the Company had a significantly higher than normal portion of its network considered under development, due to new service implemented upon converting both international and domestic destinations over from AirTran to Southwest, as well as growth in existing Southwest markets including Dallas, Houston, Washington D.C, and New York. In 2016, the portion of those markets under development will return to a more long-term historical figure based on capacity. Following the integration of AirTran, the Company also made investments in its 2015 flight schedule to improve its overall on-time performance. The Company’s on-time performance during 2015 as reported through November 2015 was approximately 80 percent, which increased approximately 7 points compared to full year 2014.

During 2015, the Company took several steps designed to enhance its existing service in cities across the network or to connect existing cities with new service not previously offered by Southwest, most notably:

• The Company began offering daily nonstop flights to 20 new cities from Dallas Love Field, marking the Company's most robust schedule ever offered at Dallas Love Field, with 180 daily departures to 50 nonstop destinations.

• The Company connected Central America to the Company's network with the addition of Liberia, Costa Rica; San Jose, Costa Rica; and Belize City, Belize in 2015.

• The Company began service to Puerto Vallarta, Mexico in June 2015.

• During October 2015, the all-new international terminal at Houston Hobby opened and the Company commenced service from Houston Hobby to Mexico (Cancun, Mexico City, Puerto Vallarta, Cabo San Lucas/Los Cabos), Belize City, Belize; San Jose, Costa Rica; Liberia, Costa Rica; and Montego Bay, Jamaica.

During 2015, the Company took delivery of 19 737-800 aircraft from Boeing and 24 pre-owned Boeing 737-700 aircraft from third parties, and retired four Boeing 737 Classic (737-300 and 737-500) aircraft during the year. Following AirTran's final passenger service on December 28, 2014, the Company removed all remaining Boeing 717-200 aircraft ("B717s") from service. As of December 31, 2015, 87 of AirTran's 88 B717 aircraft had been delivered to Delta pursuant to a lease/sublease agreement, and one B717 aircraft was undergoing conversion in preparation for delivery to Delta. See Note 7 to the Consolidated Financial Statements for further information.

The Company is scheduled to be the launch customer for Boeing’s new, more fuel-efficient 737 MAX 8 aircraft, which is expected to enter service in 2017. The 737 MAX 8 is expected to reduce fuel burn and CO2 emissions approximately 20 percent, compared with the original Next-Generation 737s (737-300 and 737-500) when they first entered service. Southwest is also scheduled to be the launch customer for the Boeing 737 MAX 7 series aircraft, with deliveries expected to begin in 2019. Currently, the Company has firm orders in place for 170 MAX 8 aircraft and 30 MAX 7 aircraft. 

At the end of December 2015, the Company revised its future firm delivery schedule to reflect 33 additional -800s, and the conversion of its remaining 25 -700 firm orders to -800s. In addition, two pre-owned -700s were added to its delivery schedule. The incremental seat gauge and aircraft will be used to replace the capacity associated with the Company's year-end decision to further accelerate the retirement of its Classic fleet to no later than mid-2018, as compared to the previous plan of 2021. The Company continues to plan for modest year-over-year fleet growth through 2018 of no more than two percent, on average. The Company also expects an approximate five to six percent increase year-over-year in 2016 ASMs. The revised delivery schedule is currently estimated to increase the Company's firm aircraft capital commitments by $400 million beyond 2015. Replacing the Boeing 737-300s and Boeing 737-500s with more efficient and cost-effective aircraft is expected to provide significant cost savings, along with improving the Customer experience with better ontime performance and WiFi-equipped aircraft. Additional information regarding the Company's aircraft delivery schedule is included in Note 4 to the Consolidated Financial Statements.

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During 2015, the following events took place regarding the Company's unionized Employee groups in contract negotiations:

• Dispatchers, represented by the Transport Workers Union, Local 550 ("TWU 550"), ratified a new four-year contract which becomes amendable on November 30, 2019.

• Flight Simulator Technicians, represented by the International Brotherhood of Teamsters, ratified a new four-year contract which becomes amendable on April 30, 2019.

• Meteorologists, represented by TWU 550, approved their first-ever collective-bargaining agreement following certification by the National Mediation Board late last year. This new, four-year contract becomes amendable on June 1, 2019.

• Flight Attendants, represented by the Transport Workers Union, Local 556, reached a tentative collective-bargaining agreement with the Company, which was announced in July 2015. The Flight Attendants failed to ratify this agreement, as announced by the Company on July 24, 2015, and the parties will continue negotiations.

• Pilots, represented by the Southwest Airlines Pilots' Association, reached a tentative collective bargaining agreement with the Company, which was announced September 17, 2015. The Pilots failed to ratify this agreement, as announced by the Company on November 4, 2015, and the parties will continue negotiations.

• Ramp, Operations, Provisioning, and Freight Agents, represented by the Transport Workers Union Local 555, reached a tentative collective bargaining agreement with the Company, which was announced on December 29, 2015. The agreement has been presented to members for ratification and the vote will be closed in first quarter 2016.

2015 Compared with 2014

Operating Revenues

Passenger revenues for 2015increased by $641 million, or 3.6 percent, compared with 2014. Holding load factor and yield constant, the increase was primarily attributable to a 7.2 percentincrease in capacity as strong Customer demand for low-fare air travel enabled the Company to fill the additional seats, as evidenced by a Company record annual load factor of 83.6 percent. On a unit basis, Passenger revenue decreased 3.4 percent, year-over-year, largely driven by a 4.7 percentdecrease in passenger revenue yield, year-over-year.

Freight revenues for 2015increased by $4 million, or 2.3 percent, compared with 2014, primarily due to increased pounds shipped. Based on current trends, the Company currently expects Freight revenues in first quarter 2016 to be comparable to fourth quarter 2015.

The Company recorded a Special revenue adjustment during 2015 of $172 million. This adjustment represented a one-time non-cash reduction to the deferred revenue liability as a result of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The adjustment is classified as a special item and thus excluded from the Company's non-GAAP financial results. See Note 1 to the Consolidated Financial Statements and the Note Regarding Use of Non-GAAP Financial Measures for further information.

Other revenues for 2015increased by $398 million, or 51.6 percent, compared with 2014, primarily as a result of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The Agreement resulted in an acceleration of the timing of revenue recognition on a prospective basis beginning July 1, 2015, as well as a change in classification. The transportation element of the consideration received is now allocated a lower relative value, resulting in a reduction in the revenues classified as Passenger on a prospective basis, and the higher relative value associated with the non-transportation elements results in an increase in the portion of revenues classified as Other within the Consolidated Statement of Income; however, the precise revenue impact for future periods is not determinable until the volume of future transactions for the period is known. Ancillary revenues increased slightly year-over-year, primarily due to an increase in EarlyBird Check-in® and A1-15 select boarding positions sold at the

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gate, which was partially offset by the decrease in revenues from the termination of AirTran passenger service and related ancillary fees.

While some yield softness has continued into January, demand for low-fare air travel, thus far, remains strong. Based on favorable booking and revenue trends, and including the estimated $110 million first quarter 2016 effect of the amended Agreement with Chase, the Company is currently expecting first quarter 2016 operating unit revenues to be flat with first quarter 2015. See Note 1 to the Consolidated Financial Statements for further information.

Operating Expenses

Operating expenses for 2015decreased by $676 million, or 4.1 percent, compared with 2014, while capacity increased 7.2 percent over the same period. Historically, except for changes in the price of fuel, changes in most Operating expenses for airlines are driven by changes in capacity, or ASMs. The following table presents the Company's Operating expenses per ASM for 2015 and 2014, followed by explanations of these changes on a per ASM basis and/or on a dollar basis:

	Year ended December 31,						Per ASM			Percent
(in cents, except for percentages)	2015			2014			change			change
Salaries, wages, and benefits		4.54	¢		4.14	¢		0.40	¢	9.7	%
Fuel and oil	2.57			4.04			(1.47		)	(36.4	)
Maintenance materials and repairs	0.72			0.75			(0.03		)	(4.0	)
Aircraft rentals	0.17			0.22			(0.05		)	(22.7	)
Landing fees and other rentals	0.83			0.85			(0.02		)	(2.4	)
Depreciation and amortization	0.72			0.72			—			—
Acquisition and integration	0.03			0.10			(0.07		)	(70.0	)
Other operating expenses	1.60			1.68			(0.08		)	(4.8	)
Total		11.18	¢		12.50	¢		(1.32	)¢	(10.6	)%

Operating expenses per ASM for 2015decreased by 10.6 percent, compared with 2014, primarily due to a decrease in Fuel and oil expense, partially offset by an increase in Salaries, wages, and benefits expense. On a non-GAAP basis, Operating expenses per ASM for 2015, excluding fuel and special items, increased 0.1 percent year-over-year primarily due to higher Salaries, wages, and benefits expense. Based on current cost trends, the Company expects its first quarter 2016 unit costs, excluding fuel, special items, and profitsharing to increase approximately two percent, compared with first quarter 2015. See the previous Note Regarding Use of Non-GAAP Financial Measures.

Salaries, wages, and benefits expense for 2015increased by $949 million, or 17.5 percent, compared with 2014. Salaries, wages, and benefits expense per ASM for 2015increased 9.7 percent, compared with 2014. On both a dollar and per ASM basis, approximately half of these increases were the result of higher salaries primarily due to the accrued $334 million of union bonuses as a result of ongoing negotiations with various workgroups during 2015, increased training, additional headcount, and contractual increases. The remaining increase was primarily due to higher profitsharing expense as a result of significantly higher profits in 2015. The Company’s profitsharing expense is based on profits that exclude the unrealized gains and/or losses the Company records for its fuel hedging program. Additionally, pursuant to the terms of the Company's ProfitSharing Plan (the "Plan"), acquisition and integration costs were excluded from the calculation of profitsharing expense from April 1, 2011, through December 31, 2013. These costs, totaling $385 million, are being amortized on a pro rata basis as a reduction of operating profits, as defined by the Plan, from 2014 through 2018. In addition, Acquisition and integration costs incurred during 2014 and 2015 reduced operating profits, as defined, in the calculation of profitsharing. Based on current cost trends, the Company expects first quarter 2016 Salaries, wages, and benefits expense per ASM, excluding profitsharing and special items, to increase, compared with first quarter 2015.

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The Company conducted negotiations with various unionized Employee groups during the year including Dispatchers, who ratified a new four-year contract, Flight Simulator Technicians, who ratified a new four-year contract, Meteorologists, who approved their first-ever collective bargaining agreement, Flight Attendants, Pilots, and Ramp, Operations, Provisioning, and Freight Agents. The following table sets forth the Company’s unionized Employee groups that are currently in negotiations on collective-bargaining agreements:

Employee Group	Approximate Number of Employees	Representatives	Amendable Date
Southwest Pilots	7,600	Southwest Airlines Pilots’ Association (“SWAPA”)	August 2012
Southwest Flight Attendants	13,100	Transportation Workers of America, AFL-CIO, Local 556 (“TWU 556”)	May 2013
Southwest Ramp, Operations, Provisioning, Freight Agents	11,000	Transportation Workers of America, AFL-CIO, Local 555 (“TWU 555”)	June 2011
Southwest Material Specialists (formerly known as Stock Clerks)	300	International Brotherhood of Teamsters, Local 19 (“IBT 19”)	August 2013
Southwest Mechanics	2,300	Aircraft Mechanics Fraternal Association (“AMFA”)	August 2012
Southwest Facilities Maintenance Technicians	40	AMFA	N/A
Southwest Flight Crew Training Instructors	80	Transportation Workers of America, AFL-CIO, Local 557 (“TWU 557”)	December 2015
Southwest Source of Support Representatives	90	IAM 142	N/A

Fuel and oil expense for 2015decreased by $1.7 billion, or 31.7 percent, compared with 2014. On a per ASM basis, Fuel and oil expense for 2015decreased 36.4 percent, compared with 2014. Excluding the impact of fuel hedge accounting, both the dollar and per ASM decreases were attributable to lower jet fuel prices. The Company's average economic jet fuel price per gallon decreased 29.1 percent year-over-year, from $2.92 for 2014 to $2.07 for 2015. The Company also slightly improved fuel efficiency, when measured on the basis of ASMs generated per gallon of fuel, primarily as a result of modernization of the Company's fleet and a 4.0 percentincrease in stage length. Fuel gallons consumed increased 5.6 percent, compared with 2014, while year-over-year capacity increased 7.2 percent.

As a result of the Company's fuel hedging program, the Company recognized losses totaling $254 million in Fuel and oil expense for 2015, compared with net gains totaling $28 million for 2014. These totals include cash settlements realized from the settlement of fuel derivative contracts totaling $577 million paid to counterparties for 2015, compared to $56 million received from counterparties for 2014, although such totals exclude gains and/or losses recognized from hedge ineffectiveness and from derivatives that do not qualify for hedge accounting. These impacts are recorded as a component of Other (gains) losses, net. See Note 10 to the Consolidated Financial Statements.

As of January 15, 2016, on an economic basis, the Company had derivative contracts in place related to expected future fuel consumption as follows:

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	Average percent of estimated fuel consumption covered by
	fuel derivative contracts at varying WTI/Brent Crude Oil,
Period	Heating Oil, and Gulf Coast Jet Fuel-equivalent price levels
First quarter 2016 (1)	—
Full year 2016 (2)	Approx. 20%
2017 (2)	Approx. 65%
2018 (2)	Approx. 35%

(1) The Company is effectively unhedged for the first quarter 2016 at current price levels. A majority of the financial impact of the derivative contracts currently held for the quarter is locked-in and is included in the economic jet fuel price simulations below.

(2) Given the Company has entered into different derivative contracts at various prices, these percentages are an average based on the assumption that Brent crude oil prices settle above current market prices. See Note 10 to the Consolidated Financial Statements for further information.

As a result of applying hedge accounting in prior periods, a portion of the amounts in Accumulated other comprehensive income (loss) (“AOCI”) are considered "frozen," and these amounts will be recognized in earnings in future periods when the underlying fuel derivative contracts settle. The following table displays the Company's estimated fair value of remaining fuel derivative contracts (not considering the impact of the cash collateral provided to or received from counterparties (See Note 10 to the Consolidated Financial Statements for further information), as well as the amount of deferred gains/losses in AOCI at December 31, 2015, and the expected future periods in which these items are expected to settle and/or be recognized in earnings (in millions):

Year	Fair value (liability) of fuel derivative contracts at December 31, 2015			Amount of gains (losses) deferred in AOCI at December 31, 2015 (net of tax)
2016	$	(863	)	$	(618	)
2017	(630		)	(409		)
2018	12			(21		)
Total	$	(1,481	)	$	(1,048	)

Based on forward market prices and the amounts in the above table (and excluding any other subsequent changes to the fuel hedge portfolio), the Company's jet fuel costs per gallon could exceed market (i.e., unhedged) prices during some of these future periods. This is based primarily on expected future cash settlements associated with fuel derivatives, but excludes any impact associated with the ineffectiveness of fuel hedges or fuel derivatives that are marked to market because they do not qualify for hedge accounting. See Note 10 to the Consolidated Financial Statements for further information. Assuming no changes to the Company's current fuel derivative portfolio, but including all previous hedge activity for fuel derivatives that have not yet settled, and considering only the expected net cash payments related to hedges that will settle, the Company is providing a sensitivity table for first quarter 2016, and full year 2016, jet fuel prices at different crude oil assumptions as of January 15, 2016, and for expected premium costs associated with settling contracts each period, respectively.

	Estimated economic jet fuel price per gallon, including taxes
Average Brent Crude Oil price per barrel	1Q 2016 (2)	Full Year 2016 (2)
$15	$1.20 - $1.25	$1.30 - $1.35
$25	$1.45 - $1.50	$1.50 - $1.55
Current Market (1)	$1.65 - $1.70	$1.70 - $1.75
$45	$2.00 - $2.05	$1.95 - $2.00
$55	$2.30 - $2.35	$2.15 - $2.20
Estimated Premium Costs (3)	$35 - $40 million	$150 - $160 million

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(1) Brent crude oil average market prices as of January 15, 2016, were approximately $30 and $33 per barrel for first quarter 2016 and full year 2016, respectively.

(2) The economic fuel price per gallon sensitivities provided assume the relationship between Brent crude oil and refined products based on market prices as of January 15, 2016.

(3) Fuel hedge premium expense is recognized as a component of Other (gains) losses, net.

Maintenance materials and repairs expense for 2015increased by $27 million, or 2.8 percent, compared with 2014. On a per ASM basis, Maintenance materials and repairs expense for 2015decreased 4.0 percent, compared with 2014, as the dollar increases were more than offset by the 7.2 percentincrease in capacity. On a dollar basis, the majority of the increase was attributable to the timing of regular airframe maintenance checks, partially offset by reduced engine and avionic repair expense as a result of the B717 aircraft transitioning out of the Company's fleet. The Company currently expects Maintenance materials and repairs expense per ASM for first quarter 2016 to increase, compared with first quarter 2015.

Aircraft rentals expense for 2015decreased by $57 million, or 19.3 percent, compared with 2014. On a per ASM basis, Aircraft rentals expense decreased 22.7 percent, compared with 2014. On both a dollar and per ASM basis, the decrease was primarily due to the transition of leased B717 aircraft out of the Company's fleet for conversion and delivery to Delta. The Company currently expects Aircraft rentals expense per ASM for first quarter 2016 to be comparable to fourth quarter 2015.

Landing fees and other rentals expense for 2015increased by $55 million, or 5.0 percent, compared with 2014. On a per ASM basis, Landing fees and other rentals expense for 2015decreased 2.4 percent, compared with 2014, as the dollar increases were more than offset by the 7.2 percentincrease in capacity. On a dollar basis, the majority of the increase was due was due to higher space rental rates at various airports. The remaining increase was due to heavier landing weights for the Company's higher capacity 737-800 aircraft, which now make up a larger portion of the Company's fleet. The Company currently expects Landing fees and other rentals expense per ASM for first quarter 2016 to decrease, compared with first quarter 2015.

Depreciation and amortization expense for 2015increased by $77 million, or 8.2 percent, compared with 2014. On a per ASM basis, Depreciation and amortization expense remained flat, compared with 2014. On a dollar basis, the majority of the increase was due to the purchase and capital lease of new and used aircraft since 2014, the majority of which replaced B717s removed from service in late 2014. The Company currently expects Depreciation and amortization expense per ASM for first quarter 2016 to increase, compared with first quarter 2015, due to the accelerated retirement of the owned 737-300 and 737-500 fleet and the acquisition of new 737-800 and 737-700 aircraft. See Note 1 to the Consolidated Financial Statements for further information.

The Company incurred $39 million in Acquisition and integration costs in 2015, related to the AirTran integration, compared with $126 million in 2014. This expense primarily consisted of Employee training, facilities integration, and certain expenses associated with the grounding and conversion costs resulting from the transition of B717s to Delta. The Company does not expect to incur any further Acquisition and integration costs beyond 2015. See Note 7 to the Consolidated Financial Statements for further information.

Other operating expenses for 2015increased by $37 million, or 1.7 percent, compared with 2014. On a per ASM basis, Other operating expenses for 2015decreased 4.8 percent, compared with 2014, as the dollar increases were more than offset by the 7.2 percentincrease in capacity. On a dollar basis, the increase was equally attributable to higher personnel expenses associated with travel costs of the Company's flight crew and credit card fees paid to third parties associated with the increase in Passenger revenues. These and other smaller increases were partially offset by a decrease in security expenses as a result of the repeal of the TSA Aviation Security Infrastructure Fee in October 2014 and a litigation settlement received by the Company in the first quarter of 2015. The Company currently expects Other operating expenses per ASM for first quarter 2016 to be comparable with fourth quarter 2015.

Other

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Other (gains) losses, net, primarily includes amounts recorded as a result of the Company's hedging activities. See Note 10 to the Consolidated Financial Statements for further information on the Company's hedging activities. The following table displays the components of Other (gains) losses, net, for the years ended December 31, 2015, and 2014:

	Year ended December 31,
(in millions)	2015			2014
Mark-to-market impact from fuel contracts settling in future periods	$	373		$	251
Ineffectiveness from fuel hedges settling in future periods	(9		)	5
Realized ineffectiveness and mark-to-market (gains) or losses	72			(4		)
Premium cost of fuel contracts	124			62
Other	(4		)	(5		)
	$	556		$	309

Income Taxes

The Company's effective tax rate was approximately 37.3 percent for 2015, compared with 37.4 percent for 2014. On a non-GAAP basis, the Company currently projects a full year 2016 effective tax rate of approximately 37 to 38 percent based on forecasted financial results. However, the Company’s effective tax rate during interim periods of 2016 may differ significantly from this full-year estimate.

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Reconciliation of Reported Amounts to Non-GAAP Financial Measures (unaudited) (in millions, except per share and per ASM amounts)

	Year ended December 31,						Percent Change
	2014			2013
Fuel and oil expense, unhedged	$	5,321		$	5,645
Add (Deduct): Fuel hedge (gains) losses included in Fuel and oil expense	(28		)	118
Fuel and oil expense, as reported	$	5,293		$	5,763
Deduct: Net impact from fuel contracts	(28		)	(84		)
Fuel and oil expense, non-GAAP	$	5,265		$	5,679		(7.3	)%
Total operating expenses, as reported	$	16,380		$	16,421
Add (Deduct): Reclassification between Fuel and oil and Other (gains) losses, net, associated with current period   settled contracts	(4		)	3
Deduct: Contracts settling in the current period, but for which gains and/or (losses) have been recognized in a prior   period*	(24		)	(87		)
Deduct: Acquisition and integration costs	(126		)	(86		)
Deduct: Union contract bonuses	(9		)	—
Total operating expenses, non-GAAP	$	16,217		$	16,251		(0.2	)%
Operating income, as reported	$	2,225		$	1,278
Add (Deduct): Reclassification between Fuel and oil and Other (gains) losses, net, associated with current period   settled contracts	4			(3		)
Add: Contracts settling in the current period, but for which gains and/or (losses) have been recognized in a prior   period*	24			87
Add: Acquisition and integration costs	126			86
Add: Union contract bonuses	9			—
Operating income, non-GAAP	$	2,388		$	1,448		64.9	%
Net income, as reported	$	1,136		$	754
Add (Deduct): Mark-to-market impact from fuel contracts settling in future periods	251			(103		)
Add: Ineffectiveness from fuel hedges settling in future periods	5			11
Add: Other net impact of fuel contracts settling in the current or a prior period (excluding reclassifications)	24			87
Add (Deduct): Income tax impact of fuel contracts	(104		)	2
Add: Acquisition and integration costs (a)	79			54
Add: Union contract bonuses (a)	6			—
Net income, non-GAAP	$	1,397		$	805		73.5	%
Net income per share, diluted, as reported	$	1.64		$	1.05
Add: Net impact to net income above from fuel contracts divided by dilutive shares (a)	0.25			—
Add: Impact of special items, net (a)	0.12			0.07
Net income per share, diluted, non-GAAP	$	2.01		$	1.12		79.5	%
Operating expenses per ASM (cents)		12.50	¢		12.60	¢
Deduct: Fuel expense divided by ASMs (cents)	(4.04		)	(4.42		)
Deduct: Impact of special items, net (cents)	(0.10		)	(0.07		)
Operating expenses per ASM, non-GAAP, excluding fuel and special items (cents)		8.36	¢		8.11	¢	3.1	%

*As a result of prior hedge ineffectiveness and/or contracts marked to market through earnings.

(a) Amounts net of tax

See previous Note Regarding Use of Non-GAAP Financial Measures.

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2014 Compared with 2013

Operating Revenues

Passenger revenues for 2014 increased by $937 million, or 5.6 percent, compared with 2013. Holding other factors constant, approximately half of the increase in Passenger revenues was attributable to the 2.4 point increase in load factor and the majority of the remaining increase was attributable to higher passenger yields, both driven by strong Customer demand for air travel and successful execution of the Company's strategic initiatives. Passenger revenue included an increase due to a change in estimate, which was recorded on a prospective basis and effective October 1, 2014, of approximately $55 million. See Note 1 to the Consolidated Financial Statements regarding this change in accounting estimate.

Freight revenues for 2014 increased by $11 million, or 6.7 percent, compared with 2013, primarily due to benefits from new and maturing markets as a result of the AirTran integration.

Other revenues for 2014 decreased by $42 million, or 5.2 percent, compared with 2013, primarily due to a decline in ancillary revenues. The majority of the decline in ancillary revenues was due to the adoption of Southwest's more Customer-friendly fee policies for Customers who could purchase travel on AirTran in 2014 through southwest.com, and the overall reduction in AirTran flights in 2014 as a result of the integration process. This decline was partially offset by an increase in certain Southwest specific ancillary revenues, such as EarlyBird Check-in® and A1-15 select boarding positions sold at the gate.

Operating Expenses

Operating expenses for 2014 decreased by $41 million, or 0.2 percent, compared with 2013, while capacity increased 0.5 percent over the same period. Historically, except for changes in the price of fuel, changes in most Operating expenses for airlines are driven by changes in capacity, or ASMs. The following table presents the Company's Operating expenses per ASM for 2014 and 2013, followed by explanations of these changes on a per ASM basis and/or on a dollar basis:

	Year ended December 31,						Per ASM			Percent change
(in cents, except for percentages)	2014			2013			change
Salaries, wages, and benefits		4.14	¢		3.86	¢		0.28	¢	7.3	%
Fuel and oil	4.04			4.42			(0.38		)	(8.6	)
Maintenance materials and repairs	0.75			0.83			(0.08		)	(9.6	)
Aircraft rentals	0.22			0.28			(0.06		)	(21.4	)
Landing fees and other rentals	0.85			0.85			—			—
Depreciation and amortization	0.72			0.66			0.06			9.1
Acquisition and integration	0.10			0.07			0.03			42.9
Other operating expenses	1.68			1.63			0.05			3.1
Total		12.50	¢		12.60	¢		(0.10	)¢	(0.8	)%

Operating expenses per ASM for 2014 decreased by 0.8 percent, compared with 2013, primarily due to a decrease in Fuel and oil expense, partially offset by an increase in Salaries, wages, and benefits expense. On a non-GAAP basis, Operating expenses per ASM for 2014, excluding fuel and special items, increased 3.1 percent year-over-year primarily due to higher Salaries, wages, and benefits expense. See the previous Note Regarding Use of Non-GAAP Financial Measures.    

Salaries, wages, and benefits expense for 2014 increased by $399 million, or 7.9 percent, compared with 2013. Salaries, wages, and benefits expense per ASM for 2014 increased 7.3 percent, compared with 2013. On both a dollar and per ASM basis, approximately 60 percent of these increases were the result of higher salaries primarily due to increased

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training, additional headcount, and contractual increases. The majority of the remaining increase was the result of higher profitsharing expense due to increased profits in 2014.

Fuel and oil expense for 2014 decreased by $470 million, or 8.2 percent, compared with 2013. On a per ASM basis, Fuel and oil expense for 2014 decreased 8.6 percent, compared with 2013. Excluding the impact of fuel hedge accounting, both the dollar and per ASM decreases were primarily attributable to lower jet fuel prices. The Company's average economic jet fuel price per gallon decreased 6.4 percent year-over-year, from $3.12 for 2013 to $2.92 for 2014. In addition, fuel efficiency improved slightly due to the Company's fleet modernization efforts, as fuel gallons consumed decreased 0.9 percent, compared with 2013, while year-over-year capacity increased 0.5 percent.

As a result of the Company's fuel hedging program, the Company recognized net gains totaling $28 million in Fuel and oil expense for 2014, compared with net losses totaling $118 million for 2013. These totals include cash settlements realized from the settlement of fuel derivative contracts totaling $56 million received from counterparties for 2014, compared with $34 million paid to counterparties for 2013, although such totals exclude gains and/or losses recognized from hedge ineffectiveness and from derivatives that do not qualify for hedge accounting. These impacts are recorded as a component of Other (gains) losses, net.

Maintenance materials and repairs expense for 2014 decreased by $102 million, or 9.4 percent, compared with 2013. On a per ASM basis, Maintenance materials and repairs expense for 2014 decreased 9.6 percent, compared with 2013. On both a dollar and per ASM basis, approximately 70 percent of the decrease was attributable to the completion of the Evolve aircraft interior retrofit program during 2013, and the majority of the remaining decrease was attributable to lower engine and avionics repair expense as a result of the 717-200 aircraft transitioning out of the Company's fleet.

Aircraft rentals expense for 2014 decreased by $66 million, or 18.3 percent, compared with 2013. On a per ASM basis, Aircraft rentals expense decreased 21.4 percent, compared with 2013. On both a dollar and per ASM basis, the decrease primarily was due to the transition of leased B717 aircraft out of the Company's fleet for conversion and delivery to Delta.

Landing fees and other rentals expense for 2014 increased by $8 million, or 0.7 percent, compared with 2013. On a per ASM basis, Landing fees and other rentals expense for 2014 were flat, compared with 2013. The dollar increase was primarily due to heavier landing weights for the -800 aircraft.

Depreciation and amortization expense for 2014 increased by $71 million, or 8.2 percent, compared with 2013. On a per ASM basis, Depreciation and amortization expense increased 9.1 percent, compared with 2013. On both a dollar and per ASM basis, approximately half the increase was attributable to technology projects that were placed into service during 2014 and approximately half was due to the purchase of new and used aircraft over the last twelve months.

The Company incurred $126 million in Acquisition and integration costs in 2014, which primarily consisted of expense associated with the removal of the remaining B717 fleet from service during December 2014, B717 fleet conversion costs, fleet integration, Employee training, facility integration, and technology integration projects. During 2013, the Company recorded $86 million in Acquisition and integration expense, which primarily consisted of B717 fleet conversion costs, fleet integration, Employee training, technology integration projects, and facility integration expenses.

Other operating expenses for 2014 increased by $79 million, or 3.7 percent, compared with 2013. On a per ASM basis, Other operating expenses for 2014 increased 3.1 percent, compared with 2013. On both a dollar and per ASM basis, approximately 40 percent of the increase was the result of higher contract programming and consulting expenses, 20 percent of the increase was the result of maintenance agreement contract rate increases, and the remainder of the increase was due to individually insignificant items.

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Other

Other (gains) losses, net, primarily includes amounts recorded as a result of the Company's hedging activities. See Note 10 to the Consolidated Financial Statements for further information on the Company's hedging activities. The following table displays the components of Other (gains) losses, net, for the years ended December 31, 2014, and 2013:

	Year ended December 31,
(in millions)	2014			2013
Mark-to-market impact from fuel contracts settling in future periods	$	251		$	(103	)
Ineffectiveness from fuel hedges settling in future periods	5			11
Realized ineffectiveness and mark-to-market (gains) or losses	(4		)	3
Premium cost of fuel contracts	62			60
Other	(5		)	(3		)
	$	309		$	(32	)

Income Taxes

The Company's effective tax rate was approximately 37.4 percent for 2014, compared with 37.6 percent for 2013.

Liquidity and Capital Resources

Net cash provided by operating activities for 2015, 2014, and 2013 was $3.2 billion, $2.9 billion, and $2.5 billion, respectively. Operating cash inflows are primarily derived from providing air transportation to Customers. The vast majority of tickets are purchased prior to the day on which travel is provided and, in some cases, several months before the anticipated travel date. Operating cash outflows are related to the recurring expenses of airline operations. The operating cash flows for 2015, 2014, and 2013 were impacted primarily by the Company's results of operations, as adjusted for non-cash items, which increased significantly year-over-year for each period, as well as changes in the Air traffic liability and Accrued liabilities balances. Operating cash flows also can be significantly impacted by the Company’s fuel and interest rate hedge positions and the corresponding cash collateral requirements associated with those positions. The Company has the ability to post aircraft in lieu of cash collateral in certain situations, and did so during 2015. See Note 10 to the Consolidated Financial Statements for further information. During 2015 and 2014, the Company provided$570 million and $233 million, respectively, in cash collateral to derivative counterparties. In 2013, the Company received$57 million in cash collateral from derivative counterparties. Cash flows associated with entering into new fuel derivatives, which are also classified as Other, net, operating cash flows, were net outflows of $556 million in 2015, net outflows of $247 million in 2014, and net inflows of $60 million in 2013. Net cash provided by operating activities is primarily used to finance capital expenditures, repay debt, fund stock repurchases, pay dividends, and provide working capital.

Net cash used in investing activities for 2015, 2014, and 2013 was $1.9 billion, $1.7 billion, and $1.4 billion, respectively. Investing activities in 2015, 2014, and 2013 included payments for new aircraft delivered to the Company, progress payments for future aircraft deliveries, and purchases and sales of short-term and noncurrent investments, which fluctuate primarily based on anticipated working capital needs. Investing activities in 2015 and 2014 also included payments associated with airport construction projects, denoted as Assets constructed for others. See Note 4 to the Consolidated Financial Statements for further information. During 2015, 2014, and 2013, the Company's purchases and sales of short-term and noncurrent investments resulted in net cash provided of $237 million, $105 million, and $63 million, respectively. The Company currently estimates its 2016 capital expenditures will be approximately $2.0 billion.

Net cash used in financing activities for 2015, 2014, and 2013 was $1.0 billion, $1.2 billion, and $851 million, respectively. During 2015, the Company repaid $213 million in debt and capital lease obligations, compared with $561 million and $313 million during 2014 and 2013, respectively. During 2015, the Company issued $500 million2.65 percent senior unsecured notes due 2020 under its shelf registration statement, compared with the 2014 issuance of $300 million2.75 percent senior unsecured notes due 2019 under its shelf registration statement. See Note 6 to the Consolidated Financial Statements for further information. The Company repurchased approximately $1.2 billion of its outstanding common stock through authorized share repurchases during 2015, compared with repurchases of $955 million and $540 million during 2014 and 2013, respectively. The Company also paid $180 million in dividends to Shareholders during 2015, compared to $139 million in 2014 and $71 million in 2013. Although the Company currently intends to continue paying dividends on a quarterly basis for the foreseeable future, the Company's Board of Directors may change the timing, amount, and payment of dividends on the basis of results of operations, financial condition, cash requirements, future prospects, and other factors deemed relevant by the Board of Directors.

The Company is a “well-known seasoned issuer” and currently has an effective shelf registration statement registering an indeterminate amount of debt and equity securities for future sales. The Company currently intends to use the proceeds from any future securities sales off this shelf registration statement for general corporate purposes.

The Company has access to a $1 billion unsecured revolving credit facility expiring in April 2018. Interest on the facility is based on the Company's credit ratings at the time of borrowing. At the Company's current ratings, the interest cost would be LIBOR plus a spread of 112.5 basis points. The facility contains a financial covenant requiring a minimum coverage ratio of adjusted pre-tax income to fixed obligations, as defined. As of December 31, 2015, the Company was in compliance with this covenant and there were no amounts outstanding under the revolving credit facility.

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As of May 11, 2015, the Company completed its previously authorized $1.0 billion share repurchase program, bringing in a total of 28.0 million shares over the course of the program. Furthermore, on May 13, 2015, the Company's Board of Directors approved a new $1.5 billion share repurchase program. Following the Board of Directors' authorization of the Company's new $1.5 billion share repurchase program, the Company entered into the following share repurchases:

Share repurchases	Shares received	Cash paid
Second Quarter Accelerated Share Repurchase Program	8,085,077	$	300,000,000
Third Quarter Accelerated Share Repurchase Program	12,892,204	500,000,000
Total	20,977,281	$	800,000,000

On July 8, 2015, Moody's upgraded the Company's secured equipment trust certificates and its senior unsecured debt rating to “Baa1” from “Baa2." The upgrade of the Company’s senior unsecured debt rating was based on improving credit metrics, with the Company having meaningfully strengthened its earnings, cash flow and financial leverage in recent years while executing the AirTran integration.

On October 30, 2015, Fitch upgraded the Company's debt rating to "BBB+" from "BBB" and revised the rating outlook to positive from stable. Fitch noted the Company's improved credit portfolio due to the integration of AirTran, its continued pay down of debt, and its credit metrics, which have returned to pre-recession levels.

Standard and Poor's credit rating for the Company is 'BBB' and is unchanged from 2014.

The Company has a large net deferred tax liability on its Consolidated Balance Sheet. The deferral of income taxes has resulted in a significant benefit to the Company and its liquidity position. Since the Company purchases the majority of the aircraft it acquires, it has been able to utilize accelerated depreciation methods (including bonus depreciation) available under the Internal Revenue Code of 1986, as amended, in 2015 and in previous years, which has enabled the Company to defer the cash tax payments associated with these depreciable assets to future years. Based on the Company’s scheduled future aircraft deliveries from Boeing and existing tax laws in effect, the Company will continue to defer a portion of cash income taxes to future years. The Company has paid in the past, and will continue to pay in the future, significant cash taxes to the various taxing jurisdictions where it operates. The Company expects to be able to continue to meet such obligations utilizing cash and investments on hand, as well as cash generated from its ongoing operations.

Off-Balance Sheet Arrangements, Contractual Obligations, and Contingent Liabilities and Commitments

The Company has contractual obligations and commitments primarily with regard to future purchases of aircraft, payment of debt, and lease arrangements. During December 2015, the Company and Boeing revised the Company's future firm aircraft order book to reflect 33 additional -800s, and the conversion of its remaining 25 -700 firm orders to -800s. For aircraft commitments with Boeing, the Company is required to make cash deposits toward the purchase of aircraft in advance. These deposits are classified as Deposits on flight equipment purchase contracts in the Consolidated Balance Sheet until the aircraft is delivered, at which time deposits previously made are deducted from the final purchase price of the aircraft and are reclassified as Flight equipment. See Note 4 to the Consolidated Financial Statements for a complete table of the Company’s firm orders, options, and purchase rights with Boeing and other parties.

The leasing of aircraft (including the sale and leaseback of aircraft) provides flexibility to the Company as a source of financing. Although the Company is responsible for all maintenance, insurance, and expense associated with operating leased aircraft, and retains the risk of loss for these aircraft, it has not made guarantees to the lessors regarding the residual value (or market value) of the aircraft at the end of the lease terms. As of December 31, 2015, the Company had 201 leased aircraft, including 78 B717s subleased to Delta. Of these leased aircraft, 171 are under operating leases, including 76 B717s subleased to Delta. Assets and obligations under operating leases are not included in the Company’s

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Consolidated Balance Sheet. Disclosure of the contractual obligations associated with the Company’s leased aircraft is included below.

The Company is required to provide standby letters of credit to support certain obligations that arise in the ordinary course of business and may choose to provide letters of credit in place of posting cash collateral related to its fuel hedging positions. Although the letters of credit are off-balance sheet, the majority of the obligations to which they relate are reflected as liabilities in the Consolidated Balance Sheet. Outstanding letters of credit totaled $184 million at December 31, 2015.

The following table aggregates the Company’s material expected contractual obligations and commitments as of December 31, 2015:

	Obligations by period (in millions)
Contractual obligations	2016		2017 - 2018		2019 - 2020		Beyond 2020		Total
Long-term debt (1)	$	585	$	732	$	1,202	$	239	$	2,758
Interest commitments - fixed (2)	108		115		57		59		339
Interest commitments - floating (3)	18		47		42		—		107
Operating lease commitments (4)	557		1,019		714		1,529		3,819
Capital lease commitments (5)	46		91		89		209		435
Aircraft purchase commitments (6)	1,070		2,393		2,666		4,421		10,550
Other commitments	94		54		11		13		172
Total contractual obligations	$	2,478	$	4,451	$	4,781	$	6,470	$	18,180

(1) Includes principal only. See Note 6 to the Consolidated Financial Statements.

(2) Related to fixed-rate debt only.

(3) Interest obligations associated with floating-rate debt (either at issuance or through swaps) is estimated utilizing forward interest rate curves as of December 31, 2015, and can be subject to significant fluctuation.

(4) Includes Love Field Modernization Program commitment amounts, and includes the impact of the B717 lease/sublease transaction entered into in 2012. See Note 7 to the Consolidated Financial Statements.

(5) Includes interest on capital leases.

(6) Firm orders from Boeing and commitments with other parties.

The Company believes that its current liquidity position, including unrestricted cash and short-term investments of $3.1 billion as of December 31, 2015, anticipated future internally generated funds from operations, and its fully available, unsecured revolving credit facility of $1.0 billion that expires in April 2018, will enable it to meet its future known obligations in the ordinary course of business. However, if a liquidity need were to arise, the Company believes it has access to financing arrangements because of its current investment grade credit ratings, large value of unencumbered assets, and modest leverage, which should enable it to meet its ongoing capital, operating, and other liquidity requirements. The Company will continue to consider various borrowing or leasing options to maximize liquidity and supplement cash requirements as necessary.

Airport Projects

The Company has commitments associated with various airport improvement projects that will impact its future liquidity needs in differing ways. These projects include the construction of new facilities and the rebuilding or modernization of existing facilities and are discussed in more detail in Note 4 to the Consolidated Financial Statements.

Dallas Love Field

For the rebuilding of the facilities at Dallas Love Field, the Company has guaranteed principal, premium, and interest on $456 million in bonds issued by the Love Field Airport Modernization Corporation (“LFAMC”) that were utilized to fund the majority of the project. Repayment of the bonds will be through the “Facilities Payments” described below.

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Reimbursement of the Company for its payment of Facilities Payments is expected to be made through recurring ground rents, fees, and other revenues collected at the airport.

Prior to the issuance of the bonds by the LFAMC, the Company entered into two separate funding agreements: (i) a “Facilities Agreement” pursuant to which the Company is obligated to make debt service payments on the principal and interest amounts associated with the bonds ("Facilities Payments"), less other sources of funds the City of Dallas may apply to the repayment of the bonds (including but not limited to passenger facility charges collected from passengers originating from the airport); and (ii) a “Revenue Credit Agreement” pursuant to which the City of Dallas will reimburse the Company for the Facilities Payments made by the Company.

A majority of the monies transferred from the City of Dallas to the Company under the Revenue Credit Agreement are expected to originate from a reimbursement account created in the “Use and Lease Agreement” between the City of Dallas and the Company. The Use and Lease Agreement is a 20-year agreement providing for, among other things, the Company’s lease of space at the Airport from the City of Dallas. The remainder of such monies transferred from the City of Dallas to the Company under the Revenue Credit Agreement is expected to originate from (i) use and lease agreements with other airlines, (ii) various concession agreements, and (iii) other airport miscellaneous revenues.

The Company’s liquidity could be impacted by this project to the extent there are timing differences between the Company’s payment of the Facilities Payments pursuant to the Facilities Agreement and the transfer of monies back to the Company pursuant to the Revenue Credit Agreement; however, the Company does not currently expect that to occur. The project is not expected to have a significant impact on the Company’s capital resources or financial position.

Fort Lauderdale-Hollywood International Airport

The Company has committed to oversee and manage the design and construction of Fort-Lauderdale-Hollywood International Airport's Terminal 1 Modernization Project, including the design and construction of a new five-gate Concourse A with an international processing facility, at a cost not to exceed $295 million. Funding for the project will come directly from Broward County aviation sources, but will flow through the Company in its capacity as manager of the project. In general, as work is being completed on the project by various contractors, invoices would be submitted to Broward County for initial payment to the Company, which would then make such payments to the contractors performing the work.

The Company’s liquidity could be impacted by this project to the extent there are instances in which the Company chooses to make payments to contractors prior to receiving initial payment from Broward County, although the Company currently does not expect this to occur often based on its past experience with smaller projects conducted at the airport. The project is not expected to have a significant impact on the Company’s capital resources or financial position. Major construction on the project began during third quarter 2015 and is estimated to be completed during 2017.

Houston William P. Hobby Airport

The Company oversaw and managed the construction, at Houston William P. Hobby Airport, of a new five-gate international terminal with international passenger processing facilities, expansion of the existing security checkpoint, and upgrades to the Southwest ticketing counter area. The Company and the City of Houston ("City") entered into an Airport Use and Lease Agreement ("Lease") to control the execution of this expansion and the financial terms thereof. The project cost approximately $156 million, and the Company provided the funding for, and management of the project. In return, the Company receives a monthly credit for the capital cost portions of the international terminal from the date of initial occupancy of the terminal until expiration of the Lease. Additionally, a small portion of the project qualified for rental credits that will be utilized against the Company’s 2016 lease payments at the airport. At any time after the completion of the project, the City may buy out the Company’s investment in the international terminal via a cash payment for the then-unamortized cost of the project.

The Company’s liquidity has been impacted by this project from the point of initial funding through the time at which it receives monthly credits, and whether or not the City chooses to buy out the Company’s investment prior to the full amortization of the project. The project did not have a significant impact on the Company’s capital resources or financial

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position. Construction began during third quarter 2013 and was effectively completed in October 2015, at which time the Company began operating from the new facility.

Los Angeles International Airport

In March 2013, the Company executed a lease agreement with Los Angeles World Airports (“LAWA”), which owns and operates Los Angeles International Airport. Under the lease agreement, which was amended in June 2014, the Company is overseeing and managing the design, development, financing, construction and commissioning of the airport's Terminal 1 Modernization Project (the “Project”) at a cost not to exceed $526 million. The Project is being funded primarily using the Regional Airports Improvement Corporation ("RAIC"), which is a quasi-governmental special purpose entity that acts as a conduit borrower under a syndicated credit facility provided by a group of lenders. Loans made under the credit facility are being used to fund the development of the Project, and the outstanding loans will be repaid with the proceeds of LAWA’s payments to purchase completed Project phases. The Company has guaranteed the obligations of the RAIC under the credit facility. 

The Company’s liquidity could be impacted by this project under certain circumstances; however, the Company does not expect this to occur based on its past experience with other projects. The project is not expected to have a significant impact on the Company’s capital resources or financial position. Construction on the Project began during 2014 and is estimated to be completed during 2018.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

The Company’s Consolidated Financial Statements have been prepared in accordance with GAAP. The Company’s significant accounting policies are described in Note 1 to the Consolidated Financial Statements. The preparation of financial statements in accordance with GAAP requires the Company’s management to make estimates and assumptions that affect the amounts reported in the Consolidated Financial Statements and accompanying footnotes. 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.

Revenue Recognition

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Tickets sold for Passenger air travel are initially deferred as Air traffic liability. Passenger revenue is recognized and Air traffic liability is reduced when the service is provided (i.e., when the flight takes place). Air traffic liability primarily represents tickets sold for future travel dates and funds that are past flight date and remain unused. The balance in Air traffic liability, which includes a portion of the Company’s liability associated with its frequent flyer program, fluctuates throughout the year based on seasonal travel patterns, fare sale activity, and activity associated with the Company’s frequent flyer program.

For air travel on Southwest, the amount of tickets that will expire unused are estimated and recognized in Passenger revenue once the scheduled flight date has passed. Estimating the amount of tickets that will expire unused involves some level of subjectivity and judgment. The majority of Southwest’s tickets sold are nonrefundable, which is the primary source of unused tickets. In September 2013, Southwest implemented a No Show policy that applies to nonrefundable fares that are not canceled or changed by a Customer at least ten minutes prior to a flight's scheduled departure. See Note 1 to the Consolidated Financial Statements for further information. According to Southwest’s current “Contract of Carriage,” all refundable tickets that are sold but not flown on the travel date can be reused for another flight up to a year from the date of sale, or some tickets can be refunded. This policy also applies to unused Customer funds that may be the result of an exchange downgrade. A small percentage of tickets (or partial tickets) expire unused. Fully refundable tickets rarely expire unused. Estimates of tickets that will expire unused are based on historical experience over many years. Southwest has consistently applied this accounting method to estimate revenue from unused tickets at the date of scheduled travel.

Events and circumstances outside of historical fare sale activity or historical Customer travel patterns can result in actual spoiled tickets differing significantly from estimates. The Company evaluates its estimates within a narrow range of acceptable amounts. If actual spoilage results in an amount outside of this range, estimates and assumptions are reviewed and adjustments to Air traffic liability and to Passenger revenue are recorded, as necessary. Additional factors that may affect estimated spoiled tickets include, but may not be limited to, changes to the Company’s ticketing policies, the Company’s refund, exchange, and unused funds policies, the mix of refundable and nonrefundable fares, promotional fare activity, and the impact of the economic environment on Customer behavior. The Company’s estimation techniques have been consistently applied from year to year; however, as with any estimates, actual spoiled tickets may vary from estimated amounts. During 2014, the Company revised assumptions regarding Customer behavior subsequent to the implementation of its No Show policy. Consequently, the Company’s estimate of the amount of spoiled tickets recorded during 2014 was approximately 15 percent higher than what it believed its historical averages would indicate for that year. The Company believes the change in policy resulted in a permanent shift in Customer behavior for 2014 and all subsequent periods, barring any future modifications to the Company's ticketing policies. The Company believes these estimates are supported by actual data and are reasonable given the underlying fact patterns.

The Company believes it is unlikely that materially different estimates for future spoiled tickets would be reported based on other reasonable assumptions or conditions suggested by actual historical experience and other data available at the time estimates were made.

Accounting for Long-Lived Assets

Flight equipment and related assets make up the majority of the Company’s long-lived assets. Flight equipment primarily relates to the 609 Boeing 737 aircraft in the Company’s fleet at December 31, 2015, which are either owned or on capital lease. The remaining 95 Boeing 737 aircraft in the Company’s fleet at December 31, 2015, are operated under operating leases. The Company also has 88 Boeing 717 aircraft, which are part of the lease/sublease with Delta. As these aircraft are not in service for the Company, they are not included in the fleet count as of December 31, 2015. See Note 7 to the Consolidated Financial Statements for further information. In accounting for long-lived assets, the Company 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.

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The following table shows a breakdown of the Company’s long-lived asset groups along with information about estimated useful lives and residual values for new assets generally purchased from the manufacturer and assets constructed for others:

	Estimated useful life	Estimated   residual value
Airframes and engines	23 to 25 years	2 to 20 percent
Aircraft parts	Fleet life	4 percent
Assets constructed for others	25 to 30 years	17 to 25 percent
Ground property and equipment	5 to 30 years	0 to 10 percent

In estimating the lives and expected residual values of its aircraft, the Company primarily has relied upon actual experience with the same or similar aircraft types, current and projected future market information, and recommendations from Boeing. Aircraft estimated useful lives are based on the number of “cycles” flown (one take-off and landing) as well as the aircraft age. The Company has made a conversion of cycles into years based on both historical and anticipated future utilization of the aircraft. Subsequent revisions to these estimates, which can be significant, could be caused by changes to aircraft maintenance programs, changes in utilization of the aircraft (actual cycles during a given period of time), governmental regulations on aging aircraft, and changing market prices of new and used aircraft of the same or similar types. The Company evaluates its estimates and assumptions each reporting period and, when warranted, adjusts these estimates and assumptions. Generally, these adjustments are accounted for on a prospective basis through depreciation and amortization expense. See Notes 1 and 2 to the Consolidated Financial Statements for further information.

The Company believes it is unlikely that materially different estimates for expected lives, expected residual values, and impairment evaluations would be made or reported based on other reasonable assumptions or conditions suggested by actual historical experience and other data available at the time estimates were made.

Financial Derivative Instruments

The Company utilizes financial derivative instruments primarily to manage its risk associated with changing jet fuel prices. See “Quantitative and Qualitative Disclosures about Market Risk” for more information on these risk management activities, and see Note 10 to the Consolidated Financial Statements for more information on the Company’s fuel hedging program and financial derivative instruments.

All derivatives are required to be reflected at fair value and recorded on the Consolidated Balance Sheet. At December 31, 2015, the Company was a party to over 1,200 separate financial derivative instruments related to its fuel hedging program for the years 2016 through 2018. Changes in the fair values of these instruments can vary dramatically based on changes in the underlying commodity prices. For example, during 2015, market “spot” prices for Brent crude oil peaked at a high of approximately $68 per barrel and hit a low price of approximately $36 per barrel. During 2014, market spot prices ranged from a high of $115 per barrel to a low of $57 per barrel. Market price changes can be driven by factors such as supply and demand, inventory levels, weather events, refinery capacity, political agendas, the value of the U.S. dollar, geopolitical events, and general economic conditions, among other items. The financial derivative instruments utilized by the Company primarily are a combination of collars, purchased call options, call spreads, put spreads, and fixed price swap agreements.

The Company enters into financial derivative instruments with third party institutions in “over-the-counter” markets. Since the majority of the Company’s financial derivative instruments are not traded on a market exchange, the Company estimates their fair values. Depending on the type of instrument, the values are determined by the use of present value methods or standard option value models with assumptions about commodity prices based on those observed in underlying markets. Also, since there is not a reliable forward market for jet fuel beyond approximately 24 months, the Company must estimate the future prices of jet fuel in order to measure the effectiveness of the hedging instruments in offsetting changes to those prices. Forward jet fuel prices are estimated through the observation of similar commodity futures prices (such as crude oil, heating oil, and unleaded gasoline) and adjusted based on variations of those like

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commodities to the Company’s ultimate expected price to be paid for jet fuel at the specific locations in which the Company hedges.

Fair values for financial derivative instruments and forward jet fuel prices are estimated prior to the time that the financial derivative instruments settle and the time that jet fuel is purchased and consumed, respectively. However, once settlement of the financial derivative instruments occurs and the hedged jet fuel is purchased and consumed, all values and prices are known and are recognized in the financial statements. In some periods, because of increased volatility in energy markets, the Company lost hedge accounting for certain types of commodities, including the periods from July 2013 through July 2015, when the Company lost hedge accounting for West Texas Intermediate crude oil ("WTI") instruments. As such, the changes in fair value of all of the Company's derivatives in WTI were recorded directly to Other (gains) losses, net in the Consolidated Statement of Income. The Company did not lose hedge accounting for an entire commodity during any other periods presented. Although the Company continues to use a prospective assessment to determine that other commodities continue to qualify for hedge accounting in specific locations where the Company hedges, there are no assurances that these commodities will continue to qualify in the future. This is due to the fact that future price changes in these refined products may not be consistent with historical price changes. Increased volatility in these commodity markets for an extended period of time, especially if such volatility were to worsen, could cause the Company to lose hedge accounting altogether for the commodities used in its fuel hedging program, which would create further volatility in the Company’s GAAP financial results.

Estimating the fair value of these fuel derivative instruments and forward prices for jet fuel will also result in changes in their fair values from period to period and thus determine their accounting treatment. To the extent that the change in the estimated fair value of a fuel derivative instrument differs from the change in the estimated price of the associated jet fuel to be purchased, both on a cumulative and a period-to-period basis, ineffectiveness of the fuel hedge can result. This could result in the immediate recording of non-cash charges or income, representing the change in the fair value of the derivative, even though the derivative instrument may not expire/settle until a future period. Likewise, if a derivative contract ceases to qualify for hedge accounting, the change in the fair value of the derivative instrument is recorded every period to Other (gains) and losses, net in the Consolidated Statement of Income in the period of the change.

Ineffectiveness is inherent in hedging jet fuel with derivative positions based in other crude oil related commodities, especially given the past volatility in the prices of refined products. Due to the volatility in markets for crude oil and related products, the Company is unable to predict the amount of ineffectiveness each period, including the loss of hedge accounting, which could be determined on a derivative by derivative basis or in the aggregate for a specific commodity. This may result, and has historically resulted, in increased volatility in the Company’s financial statements. The amount of hedge ineffectiveness and unrealized gains and losses on the change in fair value of derivative contracts settling in future periods recorded during historical periods has been due to a number of factors. These factors include: the significant fluctuation in energy prices, the number of derivative positions the Company holds, significant weather events that have affected refinery capacity and the production of refined products, and the volatility of the different types of products the Company uses for mitigation of fuel price volatility. The discontinuation of hedge accounting for specific hedges and for specific refined products, such as unleaded gasoline, can also be a result of these factors. Depending on the level at which the Company is hedged at any point in time, as the fair value of the Company’s hedge positions fluctuate in amount from period to period, there could be continued variability recorded in the Consolidated Statement of Income, and furthermore, the amount of hedge ineffectiveness and unrealized gains or losses recorded in earnings may be material. This is primarily because small differences in the correlation of crude oil related products could be leveraged over large volumes.

The Company continually looks for better and more accurate methodologies in forecasting expected future cash flows relating to its jet fuel hedging program. These estimates are an important component used in the measurement of effectiveness for the Company’s fuel hedges. The current methodology used by the Company in forecasting forward jet fuel prices is primarily based on the idea that different types of commodities are statistically better predictors of forward jet fuel prices, depending on specific geographic locations in which the Company hedges. The Company then adjusts for certain items, such as transportation costs, that are stated in fuel purchasing contracts with its vendors, in order to estimate the actual price paid for jet fuel associated with each hedge. This methodology for estimating expected

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future cash flows (i.e., jet fuel prices) has been consistently applied during 2015, 2014, and 2013, and has not changed for either assessing or measuring hedge ineffectiveness during these periods.

The Company believes it is unlikely that materially different estimates for the fair value of financial derivative instruments and forward jet fuel prices would be made or reported based on other reasonable assumptions or conditions suggested by actual historical experience and other data available at the time estimates were made.

Fair Value Measurements

The Company utilizes unobservable (Level 3) inputs in determining the fair value of certain assets and liabilities. At December 31, 2015, these primarily included a portion of its fuel derivative option contracts, which were a net liability of $1.7 billion.

The Company determines the fair value of fuel derivative option contracts utilizing an option pricing model based on inputs that are either readily available in public markets, can be derived from information available in publicly quoted markets, or are quoted by its counterparties. In situations where the Company obtains inputs via quotes from its counterparties, it verifies the reasonableness of these quotes via similar quotes from another counterparty as of each date for which financial statements are prepared. 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. Due to the fact that certain inputs used in determining estimated fair value of its option contracts are considered unobservable (primarily implied volatility), the Company has categorized these option contracts as Level 3.

As discussed in Note 10 to the Consolidated Financial Statements, any changes in fair value of cash flow hedges that are considered to be effective, as defined, are offset within AOCI until the period in which the expected future cash flow impacts earnings. Any changes in the fair value of fuel derivatives that are ineffective, as defined, or that do not qualify for hedge accounting, are reflected in earnings within Other (gains) losses, net, in the period of the change. Because the Company has extensive historical experience in valuing the derivative instruments it holds, and such experience is continually evaluated against its counterparties each period when such instruments expire and are settled for cash, the Company believes it is unlikely that an independent third party would value the Company’s derivative contracts at a significantly different amount than what is reflected in the Company’s financial statements. In addition, the Company also has bilateral credit provisions in some of its counterparty agreements, which provide for parties (or the Company) to provide cash collateral when the fair value of fuel derivatives with a single party exceeds certain threshold levels. Since this cash collateral is based on the estimated fair value of the Company’s outstanding fuel derivative contracts, this provides further validation to the Company’s estimate of fair values.

Frequent Flyer Accounting

The Company utilizes estimates in the recognition of liabilities associated with its frequent flyer program. These estimates primarily include the liability associated with Rapid Rewards frequent flyer member ("Member") account balances that are expected to be redeemed for travel or other products at a future date. Frequent flyer account balances include points earned through flights taken, points sold to Customers, or points earned through business partners participating in the frequent flyer program.

Under the Southwest Rapid Rewards frequent flyer program, Members earn points for every dollar spent. The amount of points earned under the program is based on the fare and fare class purchased, with higher fare products (e.g., Business Select) earning more points than lower fare products (e.g., Wanna Get Away). Each fare class is associated with a points earning multiplier, and points for flights are calculated by multiplying the fare for the flight by the fare class multiplier. Likewise, the amount of points required to be redeemed for a flight is based on the fare and fare class purchased. Under the program, (i) Members are able to redeem their points for every available seat, every day, on every flight, with no blackout dates; and (ii) points do not expire so long as the Rapid Rewards Member has points-earning activity during a 24-month time period. In addition, Southwest co-branded Chase Visa credit card holders are able to redeem their points for items other than travel on Southwest Airlines, such as international flights on other

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airlines, cruises, hotel stays, rental cars, gift cards, event tickets, and more. In addition to earning points for revenue flights and qualifying purchases with Rapid Rewards Partners, Rapid Rewards Members also have the ability to purchase, gift, and transfer points, as well as the ability to donate points to selected charities.

The Company utilizes the incremental cost method of accounting for points earned through flights taken in its frequent flyer program. A liability is recorded for the estimated incremental cost of providing free travel as points are being earned. The liability recorded represents the total number of points expected to be redeemed by Members, regardless of whether the Members may have enough to qualify for a full travel award. The incremental cost liability is primarily composed of direct Passenger costs such as fuel, food, and other operational costs, but does not include any contribution to fixed overhead costs or profit. At December 31, 2015, the incremental cost liability was approximately $58 million.

The Company also sells frequent flyer points and related services to business partners participating in the frequent flyer program. The majority of the points sold to business partners are through the Southwest co-branded Chase Visa credit card. Historically, funds received from the sale of points associated with these agreements were accounted for under the residual method. Under the residual method, the Company estimated the percent of the amount received from frequent flyer points sold associated with Southwest’s co-branded Chase Visa credit card that related to free travel. The estimated amounts associated with free travel are deferred and recognized as Passenger revenue when the ultimate free travel awards are flown. During third quarter 2015, the Company executed an amended co-branded credit card agreement (“Agreement”) with Chase Bank USA, N.A. (“Chase”), which materially modified the previously existing agreement between Chase and the Company. Consideration received as part of this Agreement is subject to ASU 2009-13, "Multiple-Deliverable Revenue Arrangements - a consensus of the FASB Emerging Issues Task Force." The modified Agreement has the following multiple elements: travel points to be awarded; use of the Southwest Airlines’ brand and access to Rapid Reward Member lists; advertising elements; and the Company’s resource team. Under ASU 2009-13, these deliverables are accounted for separately and allocation of consideration from the Agreement is determined based on the relative selling price of each deliverable. The application of ASU 2009-13 to the Agreement decreases the relative value of the air transportation deliverables that the Company records as deferred revenue (and ultimately Passenger revenues when redeemed awards are flown) and increases the relative value of the marketing-related deliverables recorded in Other revenues at the time these marketing-related deliverables are provided. This is principally due to the previous application of the residual method, which effectively applied the entire discount associated with the agreement to the marketing deliverables.

Significant management judgment was used to estimate the selling price of each of the deliverables. The objective was to determine the price at which the Company would transact a sale if the product or service was sold on a stand-alone basis. The Company determined the best estimate of selling price by considering multiple inputs and methods including, but not limited to, the estimated selling price of comparable travel, discounted cash flows, brand value, published selling prices, number of points awarded, and the number of points redeemed. The Company estimated the selling prices and volumes over the term of the Agreement in order to determine the allocation of proceeds to each of the multiple deliverables. The Company records passenger revenue related to air transportation and certificates for discounted companion travel when the transportation is delivered. A 1.0 percent increase or decrease in the Company's estimate of the allocation of proceeds to air transportation would have changed the Company's Operating revenues by less than $5 million for 2015.

The Company followed the transition approach of ASU 2009-13, which required that the Company's existing deferred revenue balance, classified within Air traffic liability, be adjusted to reflect the value, on a relative selling price basis, of any undelivered element remaining at the date of contract modification. The relative selling price of the undelivered element (air transportation) was lower than the rate at which it had been deferred under the previous contract and the Company recorded a one-time, non-cash adjustment to decrease frequent flyer deferred revenue and increase revenue through the recording of a Special revenue adjustment of $172 million. In addition, 2015 Operating revenues increased by an estimated net $255 million as a result of the amended Agreement with Chase and the resulting July 1, 2015, change in accounting methodology. See Note 1 to the Consolidated Financial Statements for further information.

Under its current program, Southwest estimates the portion of frequent flyer points that will not be redeemed. In estimating spoilage, the Company takes into account the Member’s past behavior, as well as several factors related to

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the Member’s account that are expected to be indicative of the likelihood of future point redemption. These factors include, but are not limited to, tenure with program, points accrued in the program, and whether or not the customer has a co-branded credit card. During fourth quarter 2014, the Company obtained sufficient historical behavioral data to develop a predictive statistical model to analyze the amount of spoilage expected for points sold to business partners, which indicated an increase in the expected spoilage rate. This change in estimate, which was recorded on a prospective basis, as of October 1, 2014, resulted in an increase in Passenger revenue of approximately $55 million for the quarter and the year ended December 31, 2014, and an increase in Passenger revenue of approximately $115 million for the first nine months of 2015. The Company has again updated its analysis of projected spoilage and implemented a new rate on a prospective basis beginning in fourth quarter 2015. The application of the new spoilage rate as of October 1, 2015, did not result in a significant difference to Passenger revenues during fourth quarter 2015, and is likewise not expected to have a material impact on 2016 Passenger revenues. For the year ended December 31, 2015, based on actual redemptions of points sold to business partners, a hypothetical one percentage point change in the estimated spoilage rate would have resulted in a change to Passenger revenue of approximately $34 million (an increase in spoilage would have resulted in an increase in revenue and a decrease in spoilage would have resulted in a decrease in revenue). Given that Member behavior will continue to develop as the program matures, the Company expects the current estimates may change in future periods. However, the Company believes its current estimates are reasonable given current facts and circumstances.

Goodwill and Other Intangible Assets

As a result of the Company’s acquisition of AirTran on May 2, 2011, the Company has reflected Goodwill on its Consolidated Balance Sheet in the amount of $970 million at December 31, 2015, the excess of the consideration transferred over the fair value of AirTran’s assets and liabilities on the acquisition date. In addition, the Company's other intangible assets have a net carrying amount of approximately $464 million at December 31, 2015, of which $303 million related to indefinite-lived intangible assets. Indefinite-lived assets are not amortized and primarily consist of take-off and landing slots at certain domestic slot-controlled airports. Finite-lived intangible assets include leasehold rights to airport gates and certain intangible assets recognized as a part of the valuation of AirTran and are amortized over their estimated economic useful lives. Goodwill and indefinite-lived intangible assets are not amortized, but tested for impairment annually, as of October 1st, or more frequently if events or circumstances indicate that impairment may exist.

The Company applies a fair value based impairment test to the carrying value of goodwill and indefinite-lived intangible assets annually on October 1st, or more frequently if certain events or circumstances indicate that an impairment loss may have been incurred. The Company assesses the value of goodwill and indefinite-lived assets under either a qualitative or quantitative approach. Under a qualitative approach, the Company considers various market factors, including applicable key assumptions listed below. These factors are analyzed to determine if events and circumstances have affected the fair value of goodwill and indefinite-lived intangible assets. If the Company determines that it is more likely than not that an indefinite-lived intangible asset is impaired, the quantitative approach is used to assess the asset’s fair value and the amount of the impairment. Under a quantitative approach, the fair value is calculated based on key assumptions listed below. If the asset’s carrying value exceeds its fair value calculated using the quantitative approach, an impairment charge is recorded for the difference in fair value and carrying value.

When performing a quantitative impairment assessment of goodwill and indefinite-lived intangible assets, fair value is estimated based on (i) recent market transactions, where available, (ii) projected discounted cash flows (an income approach) or (iii) a combination of limited market transactions and the lease savings method (which reflects potential annual after-tax lease savings arising from owning the slots rather than leasing them from another airline at market rates).

Key assumptions and/or estimates made in the Company’s impairment tests include: (i) a projection of revenues, expenses, and cash flows; (ii) terminal period revenue growth and cash flows; (iii) an estimated weighted average cost of capital; (iv) an assumed discount rate depending on the asset, (v) a tax rate and (vi) market prices for comparable assets. The Company believes these assumptions are consistent with those a hypothetical market participant would use given circumstances that were present at the time the estimates were made. However, actual results and amounts may be significantly different from the Company’s estimates.

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As part of this evaluation, the Company assesses whether changes in (i) macroeconomic conditions; (ii) industry and market conditions; (iii) cost factors; (iv) overall financial performance; and (v) Company-specific events, have occurred which would impact the use and/or fair value of these assets since the Company's quantitative analysis in 2013. In 2015, the Company performed a qualitative assessment of goodwill and determined that there was no indication that goodwill was impaired. The qualitative assessment included analysis and weighting of all relevant factors noted above. The Company performed a quantitative assessment of all indefinite-lived intangible assets and determined that there was no impairment in 2015.

Future impairment of Goodwill and indefinite-lived intangible assets may result from changes in assumptions, estimates, or circumstances, some of which are beyond the Company’s control. Factors which could result in an impairment of Goodwill, holding other assumptions constant, could include, but are not limited to: (i) reduced passenger demand as a result of domestic or global economic conditions; (ii) significantly higher prices for jet fuel; (iii) lower fares or passenger yields as a result of increased competition or lower demand; (iv) a significant increase in future capital expenditure commitments; and (v) significant disruptions to the Company’s operations as a result of both internal and external events such as terrorist activities, actual or threatened war, labor actions by Employees, or further industry regulation. Factors which could result in an impairment of owned domestic slots, holding other assumptions constant, could include, but are not limited to: (i) a change in competition in the slotted airport; (ii) significantly higher prices for jet fuel; and (iii) increased competition at a nearby airport.

Item 7A.    Quantitative and Qualitative Disclosures About Market Risk

The Company has interest rate risk in its floating-rate debt obligations and interest rate swaps, commodity price risk in jet fuel required to operate its aircraft fleet, and market risk in the derivatives used to manage its fuel hedging program and in the form of fixed-rate debt instruments. As of December 31, 2015, Southwest operated a total of 123 aircraft under operating and capital lease. However, except for a small number of aircraft that have lease payments that fluctuate based in part on changes in market interest rates, the remainder of the leases are not considered market sensitive financial instruments and, therefore, are not included in the interest rate sensitivity analysis below. The Company also has 78 aircraft under operating and capital lease that have been subleased to another carrier. Further information about this sublease arrangement is disclosed in Note 7 to the Consolidated Financial Statements. The Company does not purchase or hold any derivative financial instruments for trading purposes. See Note 10 to the Consolidated Financial Statements for information on the Company’s accounting for its hedging program and for further details on the Company’s financial derivative instruments.

Hedging

The Company purchases jet fuel at prevailing market prices, but seeks to manage market risk through execution of a documented hedging strategy. The Company utilizes financial derivative instruments, on both a short-term and a long-term basis, as a form of insurance against the potential for significant increases in fuel prices. The Company believes there can be significant risk in not hedging against the possibility of such fuel price increases, especially in energy markets in which prices are high and/or rising. The Company expects to consume approximately 2 billion gallons of jet fuel in 2016. Based on this anticipated usage, a change in jet fuel prices of just one cent per gallon would impact

the Company’s Fuel and oil expense by approximately $20 million for 2016, excluding any impact associated with fuel derivative instruments held.

As of December 31, 2015, the Company held a net position of fuel derivative instruments that represented a hedge for a portion of its anticipated jet fuel purchases for each year from 2016 through 2018. See Note 10 to the Consolidated Financial Statements for further information. The Company may increase or decrease the size of its fuel hedge based on its expectation of future market prices, as well as its perceived exposure to cash collateral requirements contained in the agreements it has signed with various counterparties, while considering the significant cost that can be associated with different types of hedging strategies. The gross fair value of outstanding financial derivative instruments related to the Company’s jet fuel market price risk at December 31, 2015, was a net liability of $1.5 billion. In addition, $835 million in cash collateral deposits and $250 million in aircraft collateral were provided by the Company in connection with these instruments based on their fair value as of December 31, 2015. The fair values of the derivative instruments, depending on the type of instrument, were determined by use of present value methods or standard option value models with assumptions about commodity prices based on those observed in underlying markets. An immediate 10 percent increase or decrease in underlying fuel-related commodity prices from the December 31, 2015 (for all years from 2016 through 2018) prices would correspondingly change the fair value of the commodity derivative instruments in place by approximately $192 million. Fluctuations in the related commodity derivative instrument cash flows may change by more or less than this amount based upon further fluctuations in futures prices, as well as related income tax effects. In addition, this does not consider changes in cash, aircraft, or letters of credit utilized as collateral provided to or by counterparties, which would fluctuate in an amount equal to or less than this amount, depending on the type of collateral arrangement in place with each counterparty. This sensitivity analysis uses industry standard valuation models and holds all inputs constant at December 31, 2015, levels, except underlying futures prices.

The Company’s credit exposure related to fuel derivative instruments is represented by the fair value of contracts with a net positive fair value to the Company. At such times, these outstanding instruments expose the Company to credit loss in the event of nonperformance by the counterparties to the agreements. As of December 31, 2015, the Company had three counterparties in which the derivatives held were a net asset. To manage credit risk, the Company selects and will periodically review counterparties based on credit ratings, limits its exposure to a single counterparty with collateral support agreements, and monitors the market position of the program and its relative market position with each counterparty. However, if one or more of these counterparties were in a liability position to the Company and were unable to meet their obligations, any open derivative contracts with the counterparty could be subject to early termination, which could result in substantial losses for the Company. At December 31, 2015, the Company had agreements with all of its counterparties containing early termination rights triggered by credit rating thresholds and/or bilateral collateral provisions whereby security is required if market risk exposure exceeds a specified threshold amount based on the counterparty’s credit rating. The Company also had agreements with counterparties in which cash deposits, letters of credit, and/or pledged aircraft are required to be posted whenever the net fair value of derivatives associated with those counterparties exceeds specific thresholds—cash is either posted by the counterparty if the value of derivatives is an asset to the Company, or cash, letters of credit, and/or aircraft could be posted as collateral by the Company if the value of derivatives is a liability to the Company. Refer to the counterparty credit risk and collateral table provided in Note 10 to the Consolidated Financial Statements for the fair values of fuel derivatives, amounts posted as collateral, and applicable collateral posting threshold amounts as of December 31, 2015, at which such postings are triggered.

Due to the terms of the Company’s current fuel hedging agreements with counterparties and the types of derivatives held, in the Company’s judgment, it does not have significant additional exposure to future cash collateral requirements. As an example, if market prices for the commodities used in the Company’s fuel hedging activities were to decrease by 25 percent from market prices as of December 31, 2015, given the Company’s fuel derivative portfolio, its aircraft collateral facilities, and its investment grade credit rating, it would likely provide an additional $436 million in collateral which could be met by posting aircraft and/or letters of credit with its current counterparties. The Company has the option of providing cash, letters of credit, and/or pledging aircraft as collateral. At December 31, 2015, the Company had $1.4 billion in aircraft available to be posted as collateral. However, as it did in 2015, and expects to continue doing in first quarter 2016, the Company would expect to also benefit from lower market prices paid for fuel used in

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its operations. Also, the Company has the ability to manage or reduce its derivative positions by entering into offsetting positions, as it did during 2015, for a portion of its future hedge portfolio.

The Company is also subject to the risk that the fuel derivatives it uses to hedge against fuel price volatility do not provide adequate protection. A portion of the fuel derivatives in the Company's hedge portfolio are based on the market price of West Texas intermediate crude oil ("WTI"). In recent years, jet fuel prices have been more closely correlated with changes in the price of Brent crude oil ("Brent"). The Company has attempted to mitigate some of this risk by entering into more fuel hedges based on Brent crude. Although the Company has some fuel derivatives based on the price of Brent, to the extent the Company holds WTI-based derivatives, changes in the fair value of these positions will continue to create income statement volatility and may not provide complete protection against jet fuel price volatility. In addition, to add further protection, the Company may periodically enter into jet fuel derivatives for short-term timeframes. Jet fuel is not widely traded on an organized futures exchange and, therefore, there are limited opportunities to hedge directly in jet fuel for time horizons longer than approximately 24 months into the future. 

The Company also has agreements with each of its counterparties associated with its outstanding interest rate swap agreements in which cash collateral may be required based on the fair value of outstanding derivative instruments, as well as the Company’s and its counterparty’s credit ratings. As of December 31, 2015, no cash collateral deposits were provided by or held by the Company based on its outstanding interest rate swap agreements.

Due to the significance of the Company’s fuel hedging program and the emphasis that the Company places on utilizing fuel derivatives to reduce its fuel price risk, the Company has created a system of governance and management oversight and has put in place a number of internal controls designed so that procedures are properly followed and accountability is present at the appropriate levels. For example, the Company has put in place controls designed to: (i) create and maintain a comprehensive risk management policy; (ii) provide for proper authorization by the appropriate levels of management; (iii) provide for proper segregation of duties; (iv) maintain an appropriate level of knowledge regarding the execution of and the accounting for derivative instruments; and (v) have key performance indicators in place in order to adequately measure the performance of its hedging activities. The Company believes the governance structure that it has in place is adequate given the size and sophistication of its hedging program.

Financial Market Risk

The vast majority of the Company’s tangible assets are aircraft, which are long-lived. The Company’s strategy is to maintain a conservative balance sheet and grow capacity steadily and profitably under the right conditions. While the Company uses financial leverage, it strives to maintain a strong balance sheet and has a “BBB+” rating with Fitch, a “BBB” rating with Standard & Poor’s, and a “Baa1” credit rating with Moody’s as of December 31, 2015, all of which are considered “investment grade.” The Company’s French Credit Agreements due 2018 do not give rise to significant fair value risk but do give rise to interest rate risk because this borrowing was originally issued as floating-rate debt. In addition, as disclosed in Note 10 to the Consolidated Financial Statements, the Company has converted certain of its long-term debt to floating rate debt by entering into an interest rate swap agreement. Although there is interest rate risk associated with these floating rate borrowings, the risk of the French Credit Agreements due 2018 is somewhat mitigated by the fact that the Company may prepay this debt under certain conditions. See Note 6 to the Consolidated Financial Statements for more information on the material terms of the Company’s short-term and long-term debt.

As of December 31, 2015, excluding the notes or debentures that have been converted to a floating rate, the Company’s fixed-rate senior unsecured notes outstanding included its $300 million5.75% senior unsecured notes 2016, its $300 million5.125% senior unsecured notes due 2017, and its $100 million7.375% senior unsecured notes due 2027. Each of these notes had at one point been converted to floating rates, but the Company subsequently terminated the fixed-to-floating interest rate swap agreements related to them. The effect of these terminations was that the interest associated with these debts prospectively reverted back to their original fixed rates. As a result of the gains realized on these transactions, which are being amortized over the remaining term of the corresponding notes, and based on projected interest rates at the date of termination, the Company does not believe its future interest expense, based on projected future interest rates at the date of termination, associated with these notes will significantly differ from the expense it

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would have recorded had the notes remained at floating rates. The following table displays the characteristics of the Company’s secured fixed rate debt as of December 31, 2015:

	Principal amount     (in millions)		Effective     fixed rate		Final     maturity	Underlying collateral
Term Loan Agreement	$	143	6.315	%	5/6/2019	14 specified Boeing 737-700 aircraft
Term Loan Agreement	36		4.84	%	7/1/2019	4 specified Boeing 737-700 aircraft
Term Loan Agreement	329		5.223	%	5/9/2020	21 specified Boeing 737-700 aircraft

The carrying value of the Company’s floating rate debt totaled $859 million, and this debt had a weighted-average maturity of 4.36 years at floating rates averaging 1.47 percent for the year ended December 31, 2015. In total, the Company’s fixed-rate debt and floating rate debt represented 13.42 percent and 4.97 percent, respectively, of consolidated noncurrent assets at December 31, 2015.

The Company also has some risk associated with changing interest rates due to the short-term nature of its invested cash, which totaled $1.6 billion, and short-term investments, which totaled $1.5 billion at December 31, 2015. See Notes 1 and 11 to the Consolidated Financial Statements for further information. The Company currently invests available cash in certificates of deposit, highly rated money market instruments, investment grade commercial paper, treasury securities, U.S. government agency securities, and other highly rated financial instruments, depending on market conditions and operating cash requirements. As a result of previous turmoil in credit markets, the Company has discontinued further investments in auction rate securities. Because of the short-term nature of these investments, the returns earned parallel closely with short-term floating interest rates. The Company has not undertaken any additional actions to cover interest rate market risk and is not a party to any other material market interest rate risk management activities.

A hypothetical 10 percent change in market interest rates as of December 31, 2015, would not have a material effect on the fair value of the Company’s fixed-rate debt instruments. See Note 11 to the Consolidated Financial Statements for further information on the fair value of financial instruments. A change in market interest rates could, however, have a corresponding effect on earnings and cash flows associated with the Company’s floating-rate debt, invested cash (excluding cash collateral deposits held, if applicable), floating-rate aircraft leases, and short-term investments because of the floating-rate nature of these items. Assuming floating market rates in effect as of December 31, 2015 were held constant throughout a 12-month period, a hypothetical 10 percent change in those rates would have an immaterial impact on the Company’s net earnings and cash flows. Utilizing these assumptions and considering the Company’s cash balance (excluding the impact of cash collateral deposits held or provided to counterparties, if applicable), short-term investments, and floating-rate debt outstanding at December 31, 2015, an increase in rates would have a net negative effect on the Company’s earnings and cash flows, while a decrease in rates would have a net positive effect on the Company’s earnings and cash flows. However, a 10 percent change in market rates would not impact the Company’s earnings or cash flow associated with the Company’s publicly traded fixed-rate debt.

The Company is also subject to a financial covenant included in its revolving credit facility, and is subject to credit rating triggers related to its credit card transaction processing agreements, the pricing related to any funds drawn under its revolving credit facility, and some of its hedging counterparty agreements. Certain covenants include the maintenance of minimum credit ratings and/or triggers that are based on changes in these ratings. The Company’s revolving credit facility contains a financial covenant requiring a minimum coverage ratio of adjusted pre-tax income to fixed obligations, as defined. As of December 31, 2015, the Company was in compliance with this covenant and there were no amounts outstanding under the revolving credit facility. However, if conditions change and the Company fails to meet the minimum standards set forth in the revolving credit facility, there could be a reduction in the availability of cash under the facility, or an increase in the costs to keep the facility intact as written. The Company’s hedging counterparty agreements contain ratings triggers in which additional cash collateral could be required to be posted with the counterparty if the Company’s credit rating were to fall below investment grade by two of the three major rating agencies, and if the Company were in a net liability position with the counterparty. See Note 10 to the Consolidated Financial Statements for further information. As of December 31, 2015, $835 million in cash collateral deposits were

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provided by the Company under these provisions. If the Company’s credit rating had been below investment grade as of that date, the Company would not have been required to post additional cash collateral deposits with fuel hedge counterparties because it had additional room available under its existing aircraft collateral facilities.

The Company currently has agreements with organizations that process credit card transactions arising from purchases of air travel tickets by its Customers utilizing American Express, Discover, and MasterCard/VISA. Credit card processors have financial risk associated with tickets purchased for travel because, although the processor generally forwards the cash related to the purchase to the Company soon after the purchase is completed, the air travel generally occurs after that time, and the processor will have liability if the Company does not ultimately provide the air travel. Under these processing agreements, and based on specified conditions, increasing amounts of cash reserves could be required to be posted with the counterparty.

A majority of the Company’s sales transactions are processed by Chase Paymentech. Should chargebacks processed by Chase Paymentech reach a certain level, proceeds from advance ticket sales could be held back and used to establish a reserve account to cover such chargebacks and any other disputed charges that might occur. Additionally, cash reserves are required to be established if the Company’s credit rating falls to specified levels below investment grade. Cash reserve requirements are based on the Company’s public debt rating and a corresponding percentage of the Company’s Air traffic liability.

As of December 31, 2015, the Company was in compliance with all credit card processing agreements. However, the inability to enter into credit card processing agreements would have a material adverse effect on the business of the Company. The Company believes that it will be able to continue to renew its existing credit card processing agreements or will be able to enter into new credit card processing agreements with other processors in the future.

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Item 8.Financial Statements and Supplementary Data

Southwest Airlines Co.

Consolidated Balance Sheet

(in millions, except share data)

	December 31, 2015			December 31, 2014
ASSETS
Current assets:
Cash and cash equivalents	$	1,583		$	1,282
Short-term investments	1,468			1,706
Accounts and other receivables	474			365
Inventories of parts and supplies, at cost	311			342
Prepaid expenses and other current assets	188			232
Total current assets	4,024			3,927
Property and equipment, at cost:
Flight equipment	19,462			18,473
Ground property and equipment	3,219			2,853
Deposits on flight equipment purchase contracts	1,089			566
Assets constructed for others	915			621
	24,685			22,513
Less allowance for depreciation and amortization	9,084			8,221
	15,601			14,292
Goodwill	970			970
Other assets	717			534
	$	21,312		$	19,723
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	1,188		$	1,203
Accrued liabilities	2,591			1,565
Air traffic liability	2,990			2,897
Current maturities of long-term debt	637			258
Total current liabilities	7,406			5,923
Long-term debt less current maturities	2,541			2,434
Deferred income taxes	2,490			2,782
Construction obligation	757			554
Other noncurrent liabilities	760			1,255
Stockholders' equity:
Common stock, $1.00 par value: 2,000,000,000 shares authorized;   807,611,634 shares issued in 2015 and 2014	808			808
Capital in excess of par value	1,374			1,315
Retained earnings	9,409			7,416
Accumulated other comprehensive loss	(1,051		)	(738		)
Treasury stock, at cost: 160,010,017 and 132,017,550 shares   in 2015 and 2014 respectively	(3,182		)	(2,026		)
Total stockholders' equity	7,358			6,775
	$	21,312		$	19,723

See accompanying notes.

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Southwest Airlines Co.

Consolidated Statement of Income

(in millions, except per share amounts)

	Year ended December 31,
	2015			2014			2013
OPERATING REVENUES:
Passenger	$	18,299		$	17,658		$	16,721
Freight	179			175			164
Special revenue adjustment	172			—			—
Other	1,170			772			814
Total operating revenues	19,820			18,605			17,699
OPERATING EXPENSES:
Salaries, wages, and benefits	6,383			5,434			5,035
Fuel and oil	3,616			5,293			5,763
Maintenance materials and repairs	1,005			978			1,080
Aircraft rentals	238			295			361
Landing fees and other rentals	1,166			1,111			1,103
Depreciation and amortization	1,015			938			867
Acquisition and integration	39			126			86
Other operating expenses	2,242			2,205			2,126
Total operating expenses	15,704			16,380			16,421
OPERATING INCOME	4,116			2,225			1,278
OTHER EXPENSES (INCOME):
Interest expense	121			130			131
Capitalized interest	(31		)	(23		)	(24		)
Interest income	(9		)	(7		)	(6		)
Other (gains) losses, net	556			309			(32		)
Total other expenses (income)	637			409			69
INCOME BEFORE INCOME TAXES	3,479			1,816			1,209
PROVISION FOR INCOME TAXES	1,298			680			455
NET INCOME	$	2,181		$	1,136		$	754
NET INCOME PER SHARE, BASIC	$	3.30		$	1.65		$	1.06
NET INCOME PER SHARE, DILUTED	$	3.27		$	1.64		$	1.05
Cash dividends declared per common share	$	.2850		$	.2200		$	.1300

See accompanying notes.

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Southwest Airlines Co.

Consolidated Statement of Comprehensive Income

(in millions)

	Year ended December 31,
	2015			2014			2013
NET INCOME	$	2,181		$	1,136		$	754
Unrealized gain (loss) on fuel derivative instruments, net of   deferred taxes of ($181), ($430), and $31	(308		)	(727		)	52
Unrealized gain on interest rate derivative instruments, net of deferred taxes of $6, $5, and $19	9			8			31
Unrealized gain (loss) on defined benefit plan items, net of deferred taxes of ($7), ($8), and $15	(12		)	(16		)	24
Other, net of deferred taxes of $-, $-, and $7	(2		)	—			9
OTHER COMPREHENSIVE INCOME (LOSS)	$	(313	)	$	(735	)	$	116
COMPREHENSIVE INCOME	$	1,868		$	401		$	870

See accompanying notes.

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Southwest Airlines Co.

Consolidated Statement of Stockholders' Equity

(in millions, except per share amounts)

	Year ended December 31, 2015, 2014, and 2013
	Common Stock		Capital in excess of par value			Retained earnings			Accumulated other comprehensive income (loss)			Treasury stock			Total
Balance at December 31, 2012	$	808	$	1,210		$	5,768		$	(119	)	$	(675	)	$	6,992
Repurchase of common stock	—		—			—			—			(540		)	(540		)
Issuance of common and treasury stock pursuant to Employee stock plans	—		12			—			—			84			96
Net tax benefit (expense) of options exercised	—		(9		)	—			—			—			(9		)
Share-based compensation	—		18			—			—			—			18
Cash dividends, $.1300 per share	—		—			(91		)	—			—			(91		)
Comprehensive income	—		—			754			116			—			870
Balance at December 31, 2013	$	808	$	1,231		$	6,431		$	(3	)	$	(1,131	)	$	7,336
Repurchase of common stock	—		—			—			—			(955		)	(955		)
Issuance of common and treasury stock pursuant to Employee stock plans	—		40			—			—			60			100
Net tax benefit (expense) of options exercised	—		23			—			—			—			23
Share-based compensation	—		21			—			—			—			21
Cash dividends, $.2200 per share	—		—			(151		)	—			—			(151		)
Comprehensive income	—		—			1,136			(735		)	—			401
Balance at December 31, 2014	$	808	$	1,315		$	7,416		$	(738	)	$	(2,026	)	$	6,775
Repurchase of common stock	—		—			—			—			(1,180		)	(1,180		)
Issuance of common and treasury stock pursuant to Employee stock plans	—		6			—			—			24			30
Net tax benefit (expense) of options exercised	—		24			—			—			—			24
Share-based compensation	—		29			—			—			—			29
Cash dividends, $.2850 per share	—		—			(188		)	—			—			(188		)
Comprehensive income	—		—			2,181			(313		)	—			1,868
Balance at December 31, 2015	$	808	$	1,374		$	9,409		$	(1,051	)	$	(3,182	)	$	7,358

See accompanying notes.

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Southwest Airlines Co.

Consolidated Statement of Cash Flows

(in millions)

	Year ended December 31,
	2015			2014			2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	2,181		$	1,136		$	754
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,015			938			867
Unrealized (gain) loss on fuel derivative instruments	113			279			(5		)
Deferred income taxes	(109		)	501			50
Changes in certain assets and liabilities:
Accounts and other receivables	(88		)	54			(17		)
Other assets	103			142			(46		)
Accounts payable and accrued liabilities	961			36			343
Air traffic liability	94			326			400
Cash collateral received from (provided to) derivative counterparties	(570		)	(233		)	57
Other, net	(462		)	(277		)	74
Net cash provided by operating activities	3,238			2,902			2,477
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(2,041		)	(1,748		)	(1,433		)
Assets constructed for others	(102		)	(80		)	(14		)
Purchases of short-term investments	(1,986		)	(3,080		)	(3,135		)
Proceeds from sales of short-term and other investments	2,223			3,185			3,198
Other, net	(7		)	(4		)	—
Net cash used in investing activities	(1,913		)	(1,727		)	(1,384		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of long-term debt	500			300			—
Proceeds from Employee stock plans	46			110			96
Reimbursement for assets constructed for others	24			27			—
Proceeds from termination of interest rate derivative instrument	12			—			—
Payments of long-term debt and capital lease obligations	(213		)	(561		)	(313		)
Payments of cash dividends	(180		)	(139		)	(71		)
Repayment of construction obligation	(10		)	(11		)	(5		)
Repurchase of common stock	(1,180		)	(955		)	(540		)
Other, net	(23		)	(19		)	(18		)
Net cash used in financing activities	(1,024		)	(1,248		)	(851		)
NET CHANGE IN CASH AND CASH EQUIVALENTS	301			(73		)	242
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,282			1,355			1,113
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$	1,583		$	1,282		$	1,355
CASH PAYMENTS FOR:
Interest	$	105		$	128		$	133
Income taxes	$	1,440		$	155		$	346
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:
Flight equipment under capital leases	$	193		$	153		$	26
Assets constructed for others	$	192		$	88		$	105

See accompanying notes.

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Southwest Airlines Co.

Notes to Consolidated Financial Statements

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Southwest Airlines Co. (the “Company”) operates Southwest Airlines, a major domestic airline. The Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries, which include AirTran Holdings, LLC. On May 2, 2011 (the “acquisition date”), the Company acquired all of the outstanding equity of AirTran Holdings, Inc. (“AirTran Holdings”), the former parent company of AirTran Airways, Inc. (“AirTran Airways”). Throughout these Notes, the Company makes reference to AirTran, which is meant to be inclusive of AirTran Holdings, LLC, the successor to AirTran Holdings, and its subsidiaries, including among others, AirTran Airways. AirTran's final passenger service was on December 28, 2014. Although the vast majority of integration costs were incurred in periods prior to 2015, the Company incurred some additional costs in 2015 associated with the integration of AirTran, and those costs are included in Acquisition and integration costs in the accompanying Consolidated Statement of Comprehensive Income. See Note 7 for further information. The accompanying Consolidated Financial Statements include the results of operations and cash flows for all periods presented and all significant inter-entity balances and transactions have been eliminated. The preparation of financial statements in conformity with generally accepted accounting principles in the United States (GAAP) requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates.

On November 20, 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2015-17, Balance Sheet Classification of Deferred Taxes. The standard amends the current requirement for organizations to present deferred tax liabilities and assets as current and noncurrent in a classified balance sheet. Instead, organizations will now be required to classify all deferred tax assets and liabilities as noncurrent. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, with early adoption permitted. The Company early adopted this standard during fourth quarter 2015, utilizing retrospective application as permitted. As such, certain prior period amounts have been reclassified to conform to the current presentation. In the Consolidated Balance Sheet as of December 31, 2014, the Company reclassified $477 million from current Deferred income tax assets to reduce Deferred income taxes within non-current liabilities.

Cash and Cash Equivalents

Cash in excess of that necessary for operating requirements is invested in short-term, highly liquid, income-producing investments. Investments with original maturities of three months or less when purchased are classified as cash and cash equivalents, which primarily consists of certificates of deposit, money market funds, and investment grade commercial paper issued by major corporations and financial institutions. Cash and cash equivalents are stated at cost, which approximates fair value.

As of December 31, 2015, $835 millionin cash collateral deposits were provided by the Company to its fuel hedge counterparties and no cash collateral deposits were held by or provided by the Company to its interest rate hedge counterparties. As of December 31, 2014, $266 million in cash collateral deposits were provided by the Company to its fuel hedge counterparties and no cash collateral deposits were held by or provided by the Company to its interest rate hedge counterparties. Cash collateral amounts provided or held associated with fuel and interest rate derivative instruments are not restricted in any way and earn interest income at an agreed upon rate that approximates the rates earned on short-term securities issued by the U.S. Government. Depending on the fair value of the Company’s fuel and interest rate derivative instruments, the amounts of collateral deposits held or provided at any point in time can fluctuate significantly. See Note 10 for further information on these collateral deposits and fuel derivative instruments.

Short-term and Noncurrent Investments

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Short-term investments consist of investments with original maturities of greater than three months but less than twelve months when purchased. These are primarily short-term securities issued by the U.S. Government and certificates of deposit issued by domestic banks. All of these investments are classified as available-for-sale securities and are stated at fair value, which approximates cost. For all short-term investments, at each reset period or upon reinvestment, the Company accounts for the transaction as Proceeds from sales of short-term investments for the security relinquished, and Purchases of short-investments for the security purchased, in the accompanying Consolidated Statement of Cash Flows. Unrealized gains and losses, net of tax, if any, are recognized in Accumulated other comprehensive income (loss) (“AOCI”) in the accompanying Consolidated Balance Sheet. Realized net gains and losses on specific investments, if any, are reflected in Interest income in the accompanying Consolidated Statement of Income. Both unrealized and realized gains and/or losses associated with investments were immaterial for all years presented.

Noncurrent investments consist of investments with maturities of greater than twelve months. Noncurrent investments are included as a component of Other assets in the Consolidated Balance Sheet.

Accounts and Other Receivables

Accounts and other receivables are carried at cost. They primarily consist of amounts due from credit card companies associated with sales of tickets for future travel, and amounts due from business partners in the Company’s frequent flyer program. The allowance for doubtful accounts was immaterial at December 31, 2015 and 2014. In addition, the provision for doubtful accounts and write-offs for 2015, 2014, and 2013 were each immaterial.

Inventories

Inventories primarily consist of aircraft fuel, flight equipment expendable parts, materials, and supplies. All of these items are carried at average cost, less an allowance for obsolescence. These items are generally charged to expense when issued for use. The reserve for obsolescence was $47 million and $46 million at December 31, 2015, and 2014, respectively. In addition, the Company’s provision for obsolescence and write-offs for 2015, 2014, and 2013 were each immaterial.

Property and Equipment

Property and equipment is stated at cost. Capital expenditures includes payments made for aircraft, other flight equipment, purchase deposits related to future aircraft deliveries, and ground and other property and equipment. Depreciation is provided by the straight-line method to estimated residual values over periods generally ranging from 23 to 25 years for flight equipment, 5 to 30 years for ground property and equipment once the asset is placed in service, and 25 to 30 years for Assets constructed for others. Residual values estimated for aircraft generally range from 2 to 20 percent, for ground property and equipment generally range from 0 to 10 percent, and for Assets constructed for others range from 17 to 25 percent. Property under capital leases and related obligations are initially recorded at an amount equal to the present value of future minimum lease payments computed on the basis of 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. Leasehold improvements generally are amortized on a straight-line basis over the shorter of the estimated useful life of the improvement or the remaining term of the lease. Assets constructed for others primarily consists of airport improvement projects, once placed into service, in which the Company is considered the accounting owner of the facilities, and such assets are amortized to estimated residual value over the term of the Company's lease or the expected life of the asset. See Note 4 for further information.

Based on a revision of the Company's future firm aircraft order book with Boeing at the end of December 2015, the Company changed the estimated retirement dates of many of its owned 737-300 and 737-500 aircraft. Previously, this fleet was estimated to retire by mid-2021; however, pursuant to this change, the fleet and related parts are expected to be retired by mid-2018. See Note 4 for further information on the Company's future firm aircraft deliveries. This change in retirement dates is considered a change in estimate. It has been accounted for on a prospective basis, and thus the

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Company will record accelerated depreciation expense over the remainder of the useful lives for each aircraft and its related parts. The impact of this change on the year ended December 31, 2015 was immaterial. The impact of this change in estimate in 2016 is an approximate $89 million increase to Depreciation and amortization expense.

The Company evaluates its long-lived assets used in operations for impairment when events and circumstances indicate that the undiscounted cash flows to be generated by that asset are less than the carrying amounts of the asset and may not be recoverable. Factors that would indicate potential impairment include, but are not limited to, significant decreases in the market value of the long-lived asset(s), a significant change in the long-lived asset’s physical condition, and operating or cash flow losses associated with the use of the long-lived asset. If an asset is deemed to be impaired, an impairment loss is recorded for the excess of the asset book value in relation to its estimated fair value.

Aircraft and Engine Maintenance

The cost of scheduled inspections and repairs and routine maintenance costs for all aircraft and engines are charged to Maintenance materials and repairs expense as incurred. The Company also has “power-by-the-hour” agreements related to certain of its aircraft engines with external service providers. Under these agreements, which the Company has determined effectively transfer the risk and create an obligation associated with the maintenance on such engines to the counterparty, expense is recorded commensurate with each hour flown on an engine. In situations where the payments to the counterparty do not sufficiently match the level of services received during the period, expense is recorded on a straight-line basis over the term of the agreement based on the Company's best estimate of expected future aircraft utilization. For its engine maintenance contracts that do not transfer risk to the service provider, the Company records expense on a time and materials basis when an engine repair event takes place. Modifications that significantly enhance the operating performance or extend the useful lives of aircraft or engines are capitalized and amortized over the remaining life of the asset.

Goodwill and Intangible Assets

The Company applies a fair value based impairment test to the carrying value of goodwill and indefinite-lived intangible assets annually on October 1st, or more frequently if certain events or circumstances indicate that an impairment loss may have been incurred. The Company assesses the value of goodwill and indefinite-lived assets under either a qualitative or quantitative approach. Under a qualitative approach, the Company considers various market factors, including applicable key assumptions listed below. These factors are analyzed to determine if events and circumstances could reasonably have affected the fair value of goodwill and indefinite-lived intangible assets. If the Company determines that it is more likely than not that an indefinite-lived intangible asset is impaired, the quantitative approach is used to assess the asset’s implied fair value and the amount of the impairment. Under a quantitative approach, the implied fair value of the Company's identifiable assets and liabilities is calculated based on key assumptions. If the Company assets' carrying value exceeds the fair value calculated using the quantitative approach, an impairment charge is recorded for the difference in fair value and carrying value.

The following table is a summary of the Company’s intangible assets, which are included as a component of Other assets in the Company's Consolidated Balance Sheet, as of December 31, 2015 and 2014:

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		Year ended December 31, 2015				Year ended December 31, 2014
(in millions)	Weighted-average useful life (in years)	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated Amortization
Customer relationships/marketing agreements	9	$	38	$	30	$	38	$	26
Trademarks/trade names	6	36		34		36		30
Owned domestic slots	Indefinite	303		n/a		303		n/a
Leased domestic slots (b)	47	17		3		19		5
Gate leasehold rights (a)	15	180		43		60		32
Total	15	$	574	$	110	$	456	$	93

(a) Intangible assets primarily consist of acquired leasehold rights to certain airport owned gates at Chicago’s Midway International Airport, takeoff and landing slots (a “slot” is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration (“FAA”), to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports, and certain intangible assets recognized from the AirTran acquisition. The increase in Intangible assets during 2015 was primarily due to the acquisition of two additional airport gate rights at Dallas Love Field, which were subleased from United Airlines. The purchase price paid for these airport gate rights was included as a component of Capital expenditures in the accompanying Consolidated Statement of Cash Flows.

(b) Useful life of leased slots is based on the stated lease term.

The aggregate amortization expense for 2015, 2014, and 2013 was $19 million, $13 million, and $19 million, respectively. Estimated aggregate amortization expense for the five succeeding years and thereafter is as follows: 2016 – $17 million, 2017 – $14 million, 2018 – $13 million, 2019 – $13 million, 2020 – $12 million, and thereafter – $89 million.

Revenue Recognition

Tickets sold are initially deferred as Air traffic liability. Passenger revenue is recognized when transportation is provided. Air traffic liability primarily represents tickets sold for future travel dates and funds that are past flight date and remain unused. The majority of the Company’s tickets sold are nonrefundable. Refundable tickets that are sold but not flown on the travel date can be reused for another flight, up to a year from the date of sale, or refunded. A small percentage of tickets (or partial tickets) expire unused. The Company estimates the amount of tickets that expire unused and recognizes such amounts in Passenger revenue using the redemption method based on scheduled flight date. Prior to September 13, 2013, funds associated with tickets in which a passenger did not show up for a flight without canceling were able to be reused on another flight for up to twelve months. On September 13, 2013, Southwest implemented a No Show policy that applies to nonrefundable fares that are not canceled or changed by a Customer at least ten minutes prior to a flight's scheduled departure. Based on the Company's revenue recognition policy, revenue is recorded at the flight date for a Customer who does not change his/her itinerary and loses his/her funds. Amounts collected from passengers for ancillary service fees are generally recognized as Other revenue when the service is provided, which is typically the flight date.

The Company's policy is to record revenue for the estimated spoilage of tickets (including partial tickets) once the flight date has passed, under the redemption method. Initial spoilage estimates are routinely adjusted and ultimately finalized once the tickets expire, which is typically twelve months after the original purchase date. Spoilage estimates are based on the Customers' historical travel behavior as well as assumptions about the Customers' future travel behavior. Assumptions used to generate spoilage estimates can be impacted by several factors including, but not limited to: fare increases, fare sales, changes to the Company's ticketing policies, changes to the Company’s refund, exchange and unused funds policies, or economic factors.

The Company is also required to collect certain taxes and fees from Customers on behalf of government agencies and remit these back to the applicable governmental entity on a periodic basis. These taxes and fees include foreign and

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U.S. federal transportation taxes, federal security charges, and airport passenger facility charges. 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.

Frequent Flyer Program

The Company records a liability for the estimated incremental cost of providing free travel under its frequent flyer program for all amounts earned from flight activity that are expected to be redeemed for future travel. The estimated incremental cost includes direct passenger costs such as fuel, food, and other operational costs, but does not include any contribution to fixed overhead costs or profit.

Southwest also sells frequent flyer points and related services to companies participating in its frequent flyer program. Historically, funds received from the sale of points associated with these agreements were accounted for under the residual method. Under this method, the Company estimated the portion of the amounts received from the sale of frequent flyer points that related to free travel and these amounts were deferred and recognized as Passenger revenue when the ultimate free travel awards are flown. On July 1, 2015, the Company executed an amended co-branded credit card agreement ("Agreement") with Chase Bank USA, N.A. (“Chase”), through which the Company sells loyalty points and other items to Chase. This material modification triggered an accounting change under ASU 2009-13, which is recorded on a prospective basis. The impact of the accounting change is that the Company estimated the selling prices and volumes over the term of the Agreement in order to determine the allocation of proceeds to each of the deliverables (travel points to be awarded; use of the Southwest Airlines’ brand and access to Rapid Reward Member lists; advertising elements; and the Company’s resource team). The Company records passenger revenue related to air transportation and certificates for discounted companion travel when the transportation is delivered. The other elements are recognized as Other - net revenue when earned.

The Company followed the transition approach of ASU 2009-13, which required that the Company adjust the existing deferred revenue balance to reflect the value, on a relative selling price basis, of any undelivered element remaining at the date of contract modification. The relative selling price of the undelivered element (air transportation) was lower than the rate at which it had been deferred under the previous contract, and the Company recorded a one-time, non-cash adjustment to decrease frequent flyer deferred revenue and increase revenue through the recording of a Special revenue adjustment of $172 million. In addition, 2015 Operating revenues increased by a net $255 million as a result of the Agreement and the resulting July 1, 2015 change in accounting methodology, all of which would have been deferred under the Company's previous accounting. The estimated impacts on revenue and earnings from this change in accounting principle are as follows:

(in millions, except per share amounts)	Year ended December 31, 2015
Passenger revenue	$	(89	)
Special revenue adjustment	172
Other revenue	344
Operating revenues	$	427
Net income	$	227
Net income per basic share	$	0.34
Net income per diluted share	$	0.34

For all points sold to business partners that are expected to expire unused, the Company recognizes spoilage in accordance with the redemption method. The Company’s consolidated liability associated with the sale of frequent flyer points, was approximately $1.3 billion as of December 31, 2015, and 2014, which is classified within Air traffic liability. During fourth quarter 2014, the Company obtained sufficient historical behavioral data to develop a predictive statistical model to analyze the amount of spoilage expected for points sold to business partners, which indicated an

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increase in the expected spoilage rate. This change in estimate was recorded on a prospective basis, as of October 1, 2014, the impacts on revenue and earnings are as follows:

(in millions, except per share amounts)	Year ended December 31, 2015		Year ended December 31, 2014
Passenger revenue	$	115	$	55
Net income	$	61	$	29
Net income per basic share	$	0.09	$	0.04
Net income per diluted share	$	0.09	$	0.04

Advertising

Advertising costs are charged to expense as incurred. Advertising and promotions expense for the years ended December 31, 2015, 2014, and 2013 was $218 million, $207 million, and $208 million, respectively, and is included as a component of Other operating expense in the accompanying Consolidated Statement of Income.

Share-based Employee Compensation

The Company has share-based compensation plans covering certain Employees, including a plan that also covers the Company’s Board of Directors. The Company accounts for share-based compensation based on its grant date fair value. See Note 9 for further information.

Financial Derivative Instruments

The Company accounts for financial derivative instruments at fair value and applies hedge accounting rules where appropriate. The Company utilizes various derivative instruments, including jet fuel, crude oil, unleaded gasoline, and heating oil-based derivatives, to attempt to reduce the risk of its exposure to jet fuel price increases. These instruments consist primarily of purchased call options, collar structures, call spreads, put spreads, and fixed price swap agreements, and upon proper qualification are accounted for as cash-flow hedges. The Company also has interest rate swap agreements to convert a portion of its fixed-rate debt to floating rates and has swap agreements that convert certain floating-rate debt to a fixed-rate. These interest rate hedges are appropriately designated as either fair value hedges or as cash flow hedges.

Since the majority of the Company’s financial derivative instruments are not traded on a market exchange, the Company estimates their fair values. Depending on the type of instrument, the values are determined by the use of present value methods or option value models with assumptions about commodity prices based on those observed in underlying markets. Also, since there is not a reliable forward market for jet fuel, the Company must estimate the future prices of jet fuel in order to measure the effectiveness of the hedging instruments in offsetting changes to those prices. Forward jet fuel prices are estimated through utilization of a statistical-based regression equation with data from market forward prices of like commodities. This equation is then adjusted for certain items, such as transportation costs, that are stated in the Company’s fuel purchasing contracts with its vendors.

For the effective portion of settled fuel hedges, the Company records the associated gains or losses as a component of Fuel and oil expense in the Consolidated Statement of Income. For amounts representing ineffectiveness, as defined, or changes in fair value of derivative instruments for which hedge accounting is not applied, the Company records any gains or losses as a component of Other (gains) losses, net, in the Consolidated Statement of Income. Amounts that are paid or received in connection with the purchase or sale of financial derivative instruments (i.e., premium costs of option contracts) are classified as a component of Other (gains) losses, net, in the Consolidated Statement of Income in the period in which the instrument settles or expires. All cash flows associated with purchasing and selling derivatives

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are classified as operating cash flows in the Consolidated Statement of Cash Flows, within Changes in certain assets and liabilities. See Note 10 for further information on hedge accounting and financial derivative instruments.

The Company classifies its cash collateral provided to or held from counterparties in a “net” presentation on the Consolidated Balance Sheet against the fair value of the derivative positions with those counterparties. See Note 10 for further information.

Software Capitalization

The Company capitalizes certain internal and external costs related to the acquisition and development of internal use software during the application development stages of projects. The Company amortizes these costs using the straight-line method over the estimated useful life of the software, which typically ranges from five to fifteen years. Costs incurred during the preliminary project or the post-implementation/operation stages of the project are expensed as incurred. Capitalized computer software, included as a component of Ground property and equipment in the accompanying Consolidated Balance Sheet, net of accumulated depreciation, was $378 million and $403 million at December 31, 2015, and 2014, respectively. Computer software depreciation expense was $106 million, $122 million, and $90 million for the years ended December 31, 2015, 2014, and 2013, respectively, and is included as a component of Depreciation and amortization expense in the accompanying Consolidated Statement of Income.

Income Taxes

The Company accounts for deferred income taxes utilizing an asset and liability method, whereby deferred tax assets and liabilities are recognized based on the tax effect of temporary differences between the financial statements and the tax basis of assets and liabilities, as measured by current enacted tax rates. The Company also evaluates the need for a valuation allowance to reduce deferred tax assets to estimated recoverable amounts. See "Basis of Presentation" for further information on current presentation of deferred income taxes.

The Company’s policy for recording interest and penalties associated with uncertain tax positions is to record such items as a component of income before income taxes. Penalties are recorded in Other (gains) losses, net, and interest paid or received is recorded in Interest expense or Interest income, respectively, in the Consolidated Statement of Income. Amounts recorded for penalties and interest related to uncertain tax positions were immaterial for all years presented.

Concentration Risk

Approximately 83 percent of the Company’s full-time equivalent Employees are unionized and are covered by collective-bargaining agreements. The majority of the Company's unionized Employees, including its Pilots, Mechanics, Ramp, Operations, Provisioning and Freight Agents, Flight Attendants, Material Specialists, Flight Crew Training Instructors, Facilities Maintenance Technicians, and Source of Support Representatives are in discussions on labor agreements or have labor agreements which will become amendable within one year. These Employee groups represent approximately 69 percent of the Company’s full-time equivalent Employees as of December 31, 2015.

The Company attempts to minimize its concentration risk with regards to its cash, cash equivalents, and its investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security or money market fund.

To manage risk associated with financial derivative instruments held, the Company selects and will periodically review counterparties based on credit ratings, limits its exposure to a single counterparty, and monitors the market position of the program and its relative market position with each counterparty. The Company also has agreements with counterparties containing early termination rights and/or bilateral collateral provisions whereby security is required if market risk exposure exceeds a specified threshold amount or credit ratings fall below certain levels. Collateral deposits

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provided to or held from counterparties serve to decrease, but not totally eliminate, the credit risk associated with the Company’s hedging program. See Note 10 for further information.

As of December 31, 2015, the Company operated an all-Boeing fleet, all of which are variations of the Boeing 737. Following the 2011 acquisition of AirTran, the Company also operated a fleet of Boeing 717's, but these aircraft were removed from the Company's operations prior to the end of 2014. See Note 7 for further information. If the Company were unable to acquire additional aircraft or associated aircraft parts from Boeing, or Boeing were unable or unwilling to make timely deliveries of aircraft or to provide adequate support for its products, the Company’s operations would be materially adversely impacted. In addition, the Company would be materially adversely impacted in the event of a mechanical or regulatory issue associated with the Boeing 737 aircraft type, whether as a result of downtime for part or all of the Company’s fleet, increased maintenance costs, or because of a negative perception by the flying public. The Company is also dependent on sole suppliers for aircraft engines and certain other aircraft parts and would, therefore, also be materially adversely impacted in the event of the unavailability of, or a mechanical or regulatory issue associated with, engines and other parts.

The Company has historically entered into agreements with some of its co-brand, payment, and loyalty partners that contain exclusivity aspects which place certain confidential restrictions on the Company from entering into certain arrangements with other payment and loyalty partners. These arrangements generally extend for the terms of the partnerships, none of which currently extend beyond May 2022. The Company believes the financial benefits generated by the exclusivity aspects of these arrangements outweigh the risks involved with such agreements.

2. NEW ACCOUNTING PRONOUNCEMENTS AND ACCOUNTING CHANGES

On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. Following the FASB's finalization of a one year deferral of this standard, the ASU is now effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2017, with early adoption permitted for fiscal years, and interim periods within those years, beginning on or after December 15, 2016. The Company currently believes the most significant impact of this ASU on its accounting will be the elimination of the incremental cost method for frequent flyer accounting, which will require the Company to re-value its liability earned by Customers associated with flight points with a relative fair value approach, resulting in a significant increase in the liability. The Company is continuing to evaluate the new guidance and plans to provide additional information about its expected financial impact, including the expected method and period of adoption, at a future date.

On February 18, 2015, the FASB and the International Accounting Standards Board issued a final standard that amends the current consolidation guidance. The standard amends both the variable interest entity and voting interest entity consolidation models. The standard is effective for public reporting entities in fiscal periods beginning after December 15, 2015, and early adoption is permitted. Once adopted, the Company will need to assess the potential for entity consolidation under a new consolidation model; however, the Company does not believe this will result in changes to its previous consolidation conclusions. The Company will adopt this new standard during first quarter 2016.

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3. NET INCOME PER SHARE

The following table sets forth the computation of basic and diluted net income per share (in millions except per share amounts):

	Year ended December 31,
	2015		2014		2013
NUMERATOR:
Net income	$	2,181	$	1,136	$	754
Incremental income effect of   interest on 5.25% convertible notes	4		4		3
Net income after assumed conversion	$	2,185	$	1,140	$	757
DENOMINATOR:
Weighted-average shares outstanding, basic	661		687		710
Dilutive effect of Employee stock options and   restricted stock units	2		3		2
Dilutive effect of 5.25% convertible notes	6		6		6
Adjusted weighted-average shares outstanding, diluted	669		696		718
NET INCOME PER SHARE:
Basic	$	3.30	$	1.65	$	1.06
Diluted	$	3.27	$	1.64	$	1.05
Potentially dilutive amounts excluded from calculations:
Stock options and restricted stock units	—		—		9

4. COMMITMENTS AND CONTINGENCIES

Commitments

The Company has contractual obligations and commitments primarily with regard to future purchases of aircraft, repayment of debt, and lease arrangements. During the year endedDecember 31, 2015, the Company purchased 19 new 737-800 aircraft from Boeing and eight used 737-700 aircraft from third parties. In addition, the Company also leased 16 737-700 aircraft from third parties, and retired from service four of its older aircraft (two 737-300 and two 737-500).

In December 2015, the Company and Boeing agreed to modify the existing schedule of future aircraft commitments to reflect 33 additional -800s, and the conversion of its remaining 25 -700 firm orders to -800s. In addition, two pre-owned -700s were added to its delivery schedule. A total of six additional options were added to the schedule as well. As of December 31, 2015, the Company had firm deliveries and options for Boeing 737-700, 737-800, 737 MAX 7, and 737 MAX 8 aircraft as follows:

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	The Boeing Company 737 NG				The Boeing Company 737 MAX
	-800 Firm Orders	Options	Additional -700 A/C		-7 Firm Orders	-8 Firm Orders		Options	Total
2016	36	—	17		—	—		—	53
2017	35	—	14		—	14		—	63
2018	18	18	4		—	13		—	53
2019	—	—	—		15	10		—	25
2020	—	—	—		14	22		—	36
2021	—	—	—		1	33		18	52
2022	—	—	—		—	30		19	49
2023	—	—	—		—	24		23	47
2024	—	—	—		—	24		23	47
2025	—	—	—		—	—		36	36
2026	—	—	—		—	—		36	36
2027	—	—	—		—	—		36	36
Total	89	18	35	(b)	30	170	(a)	191	533

(a) The Company has flexibility to substitute MAX 7 in lieu of MAX 8 firm orders beginning in 2019.

(b) To be acquired in leases from various third parties.

The Company's financial commitments associated with the Boeing firm orders and additional scheduled deliveries in the above aircraft table are as follows: $1.1 billion in 2016, $1.3 billion in 2017, $1.1 billion in 2018, $1.2 billion in 2019, $1.5 billion in 2020, and $4.4 billion thereafter.

Fort Lauderdale-Hollywood International Airport

In December 2013, the Company entered into an agreement with Broward County, Florida, which owns and operates Fort Lauderdale-Hollywood International Airport, to oversee and manage the design and construction of the airport's Terminal 1 Modernization Project at a cost not to exceed $295 million. In addition to significant improvements to the existing Terminal 1, the project includes the design and construction of a new five-gate Concourse A with an international processing facility. Funding for the project will come directly from Broward County sources, but will flow through the Company in its capacity as manager of the project. Major construction on the project began during third quarter 2015 and is estimated to be completed during 2017. The Company believes that, due to its agreed upon role in overseeing and managing the project, it is considered the owner of the project for accounting purposes. As such, during construction, the Company records expenditures as Assets constructed for others in the Consolidated Balance Sheet, along with a corresponding outflow within Assets constructed for others in the Consolidated Statement of Cash Flows, and an increase to Construction obligation (with a corresponding cash inflow from Financing activities in the Consolidated Statement of Cash Flows) as reimbursements are received from Broward County. As of December 31, 2015, the Company had recorded construction costs related to the project of $25 million.

Houston William P. Hobby Airport

The Company entered into a Memorandum of Agreement (“MOA”) with the City of Houston (“City”), effective June 2012, to expand the existing Houston Hobby airport facility. As provided in the MOA, the Company and the City entered into an Airport Use and Lease Agreement (“Lease”) to control the execution of this expansion and the financial terms thereof. Per the MOA and Lease, this project provided a new five-gate international terminal with international passenger processing facilities, expansion of the security checkpoint, and upgrades to the Southwest Airlines ticket counter area. The project cost approximately $156 million, and the Company provided the funding for, as well as management over, the project. In return, the capital cost portion of the rent the Company pays for the international facility is waived from the initial occupancy until the expiration of the Lease. However, at any point following

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completion of the project, the City has the option to reimburse the Company's investment at the then-unamortized cost of the facility. This purchase would trigger payment of the previously waived capital cost component of rents owed the City. Additionally, a small portion of the project qualified for rental credits that will be utilized against the Company’s 2016 lease payments at the airport. Construction was effectively completed in October 2015, at which time the Company began operating from the new facility.

As a result of its significant involvement in the Houston Hobby project, the Company determined that it is the owner of the facility for accounting purposes. As such, during construction, the Company recorded expenditures as Assets constructed for others in the Consolidated Balance Sheet, along with a corresponding outflow within Assets constructed for others, in the Consolidated Statement of Cash Flows. As of December 31, 2015, the Company had recorded construction costs related to Houston Hobby of $146 million.

Los Angeles International Airport

In March 2013, the Company executed a lease agreement with Los Angeles World Airports (“LAWA”), which owns and operates Los Angeles International Airport ("LAX"). Under the lease agreement, which was amended in June 2014, the Company is overseeing and managing the design, development, financing, construction and commissioning of the airport's Terminal 1 Modernization Project (the “Project”) at a cost not to exceed $526 million. The Project is being funded primarily using the Regional Airports Improvement Corporation ("RAIC"), which is a quasi-governmental special purpose entity that acts as a conduit borrower under a syndicated credit facility provided by a group of lenders. Loans made under the credit facility are being used to fund the development of the Project, and the outstanding loans will be repaid with the proceeds of LAWA’s payments to purchase completed Project phases. The Company has guaranteed the obligations of the RAIC under the credit facility. Construction on the Project began during 2014 and is estimated to be completed during 2018. The Company believes that, due to its agreed upon role in overseeing and managing the Project, it is considered the owner of the Project for accounting purposes. LAWA will reimburse the Company for the non-proprietary renovations, while the Company will not be reimbursed for proprietary renovations. As a result, the $196 million of costs incurred as of December 31, 2015, are included within Assets constructed for others, and all amounts that have been or will be reimbursed will be included within Construction obligation on the accompanying Consolidated Balance Sheet.

Dallas Love Field

During 2008, the City of Dallas approved the Love Field Modernization Program (“LFMP”), a project to reconstruct Dallas Love Field with modern, convenient air travel facilities. Pursuant to a Program Development Agreement with the City of Dallas and the Love Field Airport Modernization Corporation (or “LFAMC,” a Texas non-profit “local government corporation” established by the City of Dallas to act on the City of Dallas' behalf to facilitate the development of the LFMP), the Company managed this project. Major construction was effectively completed by December 31, 2014. This project consisted of the complete replacement of gate facilities with a new 20-gate facility, including infrastructure, systems and equipment, aircraft parking apron, fueling system, roadways and terminal curbside, baggage handling systems, passenger loading bridges and support systems, and other supporting infrastructure.

Although the City of Dallas received commitments from various sources that are helping to fund portions of this LFMP project, including the Federal Aviation Administration (“FAA”), the Transportation Security Administration, and the City of Dallas' Aviation Fund, the majority of the funds used were from the issuance of bonds. During fourth quarter 2010, $310 million of such bonds were issued by the LFAMC, and the Company has guaranteed principal and interest payments on the bonds. An additional tranche of such bonds totaling $146 million was issued during second quarter 2012, and the Company has guaranteed the principal and interest payments on these bonds as well.

In conjunction with the Company's significant presence at Dallas Love Field, the Company agreed to manage the majority of the LFMP project. Based on the pertinent factors in place at the time the agreement was made, the Company utilized the accounting guidance provided for lessees involved in asset construction. As of December 31, 2015, the Company had recorded LFMP construction costs of $548 million within Assets constructed for others and had recorded

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a liability of $536 million within Construction obligation in its Consolidated Balance Sheet. Upon completion of different phases of the LFMP project, the Company has placed the associated assets in service and has begun depreciating the assets over their estimated useful lives. The amount of depreciation recorded for the year endedDecember 31, 2015, associated with the LFMP assets in service was $36 million. The corresponding LFMP liabilities are being reduced primarily through the Company's airport rental payments to the City of Dallas as the construction costs of the project are passed through to the Company via recurring airport rates and charges. A portion of these payments are reflected as Repayment of construction obligation in the Consolidated Statement of Cash Flows. The imputed interest rate associated with construction obligation was nominal for 2015 and 2014. During 2015, the City of Dallas issued additional bonds for the construction of a new parking garage. The Company has not guaranteed the principal or interest payments on these bonds, but remains the accounting owner of this project.

Contingencies

The Company is from time to time subject to various legal proceedings and claims arising in the ordinary course of business, including, but not limited to, examinations by the IRS. The Company's management does not expect that the outcome in any of its currently ongoing legal proceedings or the outcome of any adjustments presented by the IRS, individually or collectively, will have a material adverse effect on the Company's financial condition, results of operations, or cash flow.

5. SUPPLEMENTAL FINANCIAL INFORMATION

(in millions)	December 31, 2015		December 31, 2014
Intangible assets	$	464	$	363
Non-current investments	40		35
Other	213		136
Other assets	$	717	$	534

(in millions)	December 31, 2015		December 31, 2014
Accounts payable trade	$	178	$	123
Salaries payable	173		160
Taxes payable	179		163
Aircraft maintenance payable	168		314
Fuel payable	48		85
Other payable	442		358
Accounts payable	$	1,188	$	1,203

(in millions)	December 31, 2015			December 31, 2014
Profitsharing and savings plans	$	655		$	374
Aircraft and other lease related obligations	74			159
Vacation pay	309			292
Accrued union bonuses	329		(a)	9
Health	86			84
Derivative contracts	643			174
Workers compensation	187			165
Property and other taxes	62			81
Other	246			227
Accrued liabilities	$	2,591		$	1,565

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(a) As part of the ongoing negotiations with various union contract groups during 2015, the Company has recorded a liability for estimated bonuses that would be paid out to union members upon ratification of labor agreements. The liability excludes certain immaterial benefit costs that are included as a component of Accounts payable. The amount accrued is subject to change based on subsequent negotiations, and any changes would be recorded on a prospective basis.

(in millions)	December 31, 2015		December 31, 2014
Postretirement obligation	$	201	$	169
Non-current lease-related obligations	165		193
Other deferred compensation	179		174
Deferred gains from sale and leaseback of aircraft	43		53
Derivative contracts	74		622
Other	98		44
Other non-current liabilities	$	760	$	1,255

Other Operating Expenses

Other operating expenses consist of distribution costs, advertising expenses, personnel expenses, professional fees, and other operating costs, none of which individually exceed 10 percent of Operating expenses.

6. LONG-TERM DEBT

(in millions)	December 31, 2015		December 31, 2014
5.75% Notes due 2016	$	307	$	313
5.25% Convertible Senior Notes due 2016	111		113
5.125% Notes due 2017	309		316
French Credit Agreements due 2018—1.53%	25		36
Fixed-rate 737 Aircraft Notes payable through 2018—7.02%	17		24
2.75% Notes due 2019	303		300
Term Loan Agreement due 2019—6.315%	143		178
Term Loan Agreement due 2019—4.84%	36		73
2.65% Notes due 2020	494		—
Term Loan Agreement due 2020—5.223%	329		372
Floating-rate 737 Aircraft Notes payable through 2020	257		300
Pass Through Certificates due 2022—6.24%	340		355
7.375% Debentures due 2027	132		134
Capital leases	395		199
	$	3,198	$	2,713
Less current maturities	637		258
Less debt discount and issuance costs	20		21
	$	2,541	$	2,434

AirTran Long-Term Debt

AirTran Holdings previously entered into aircraft purchase financing facilities, and as of December 31, 2015, 19 Boeing 737 aircraft remained that were financed under floating-rate facilities. Each note is secured by a first mortgage on the aircraft to which it relates. The notes bear interest at a floating rate per annum equal to a margin plus the three or six-month LIBOR in effect at the commencement of each semi-annual or three-month period, as applicable. As of December 31, 2015, the weighted average interest rate was 1.86 percent. Principal and interest under the notes are payable semi-annually or every three months as applicable. As of December 31, 2015, the remaining debt outstanding may be prepaid without penalty under all aircraft loans provided under such facilities. The notes mature in years 2016

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to 2020. As discussed further in Note 10, a portion of the above floating-rate debt has been effectively converted to a fixed rate via interest rate swap agreements which expire between 2016 and 2020.

As of December 31, 2015, three Boeing 737 aircraft were financed under a fixed-rate facility. Each note is secured by a first mortgage on the aircraft to which it relates. As of December 31, 2015, the weighted average interest rate was 7.02 percent. Payments of principal and interest under the notes are due semi-annually. The notes mature in years 2016 to 2018.

In October 2009, AirTran Holdings completed a public offering of $115 million of convertible senior notes due November 1, 2016. Such notes bear interest at 5.25 percent payable semi-annually, in arrears, on May 1 and November 1. As a result of the acquisition and subsequent dividends declared by the Company, the convertible senior notes are convertible into AirTran conversion units of 168.6576 per $1,000 in principal amount of such notes. Based on the terms of the merger agreement, the holders of these notes would receive shares of the Company’s common stock at a conversion rate of 54.1391 shares and $615.16 in cash per $1,000 in principal amount of such notes. This conversion rate is subject to adjustment under certain circumstances such as: granting of stock and cash dividends, a make-whole fundamental change of ownership provision, the issuance of rights or warrants, and/or a distribution of capital stock. Subsequent to the acquisition, holders of $5 million in principal amount elected to convert their notes. Remaining holders may convert their convertible senior notes into cash and shares of common stock at their option at any time. The convertible senior notes are not redeemable at the Company’s option prior to maturity. The holders of the convertible senior notes may require the Company to repurchase such notes, in whole or in part, for cash upon the occurrence of a fundamental change, as defined in the governing supplemental indenture, at a repurchase price of 100 percent of the principal amount plus any accrued and unpaid interest.

As a result of triggering the fundamental change of ownership provision in the convertible senior notes and as a result of the acquisition, an embedded conversion option is deemed to exist. In accordance with applicable accounting guidance, the embedded conversion option was effectively separated and accounted for as a free-standing derivative. A fair value calculation, utilizing similar market yields and the Company’s common stock price, was performed for the debt with and without the equity to measure the equity component. The value allocated to the conversion option of $35 million is classified as permanent equity. The estimated premium associated with the notes excluding the equity feature was $10 million, and is being amortized to interest expense over the remaining life of the notes. The dilutive effect of the shares that would be issued if the convertible notes were converted is considered in the Company’s net income per share calculations, unless such conversion would be considered antidilutive. See Note 3.

Other Company Long-Term Debt

During November 2015, the Company issued $500 million senior unsecured notes due 2020. The notes bear interest at 2.65 percent, and are payable semi-annually in arrears on May 5 and November 5. Concurrently, the Company entered into a fixed-to-floating interest rate swap to convert the interest on these unsecured notes to a floating rate until their maturity. See Note 10 for further information on the interest-rate swap agreement.

During November 2014, the Company issued $300 million senior unsecured notes due 2019. The notes bear interest at 2.75 percent, payable semi-annually in arrears on May 6 and November 6. Concurrently, the Company entered into a fixed-to-floating interest rate swap to convert the interest on these unsecured notes to a floating rate until their maturity. See Note 10 for further information on the interest-rate swap agreement.

On July 1, 2009, the Company entered into a term loan agreement providing for loans to the Company aggregating up to $124 million, to be secured by mortgages on five of the Company’s 737-700 aircraft. The Company has borrowed the full $124 million and secured this loan with the requisite five aircraft mortgages. The loan matures on July 1, 2019, and is repayable semi-annually in installments of principal that began January 1, 2010. The loan bears interest at a fixed rate of 4.84 percent, and interest is payable semi-annually, which payments began on January 1, 2010. In September 2015, the Company prepaid $24 million on the loan agreement, which in turn released one of the encumbered aircraft. As such, the remaining four aircraft related to this transaction are still encumbered as of December 31, 2015.

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On April 29, 2009, the Company entered into a term loan agreement providing for loans to the Company aggregating up to $332 million, to be secured by mortgages on 14 of the Company’s 737-700 aircraft. The Company borrowed the full $332 million and secured the loan with the requisite 14 aircraft mortgages. The loan matures on May 6, 2019, and is being repaid via quarterly installments of principal that began August 6, 2009. The loan bears interest at the LIBO Rate (as defined in the term loan agreement) plus 3.30 percent, and interest is payable quarterly, which payments began on August 6, 2009. Pursuant to the terms of the term loan agreement, the Company entered into an interest rate swap agreement to convert the variable rate on the term loan to a fixed 6.315 percent until maturity.

On May 6, 2008, the Company entered into a term loan agreement providing for loans to the Company aggregating up to $600 million, to be secured by first-lien mortgages on 21 of the Company’s 737-700 aircraft. On May 9, 2008, the Company borrowed the full $600 million and secured these loans with the requisite 21 aircraft mortgages. The loans mature on May 9, 2020, and are repayable quarterly in installments of principal, with the first payment made on August 9, 2008. The loans bear interest at the LIBO Rate (as defined in the term loan agreement) plus 0.95 percent, and interest is payable quarterly. Pursuant to the terms of the term loan agreement, the Company entered into an interest rate swap agreement to convert the variable rate on the term loan to a fixed 5.223 percent until maturity.

On October 3, 2007, grantor trusts established by the Company issued $500 million Pass Through Certificates consisting of $412 million6.15% Series A certificates and $88 million6.65% Series B certificates. A separate trust was established for each class of certificates. The trusts used the proceeds from the sale of certificates to acquire equipment notes in the same amounts, which were issued by the Company on a full recourse basis. Payments on the equipment notes held in each trust will be passed through to the holders of certificates of such trust. The equipment notes were issued for each of 16 Boeing 737-700 aircraft owned by the Company and are secured by a mortgage on each aircraft. Interest on the equipment notes held for the certificates is payable semi-annually, with the first payment made on February 1, 2008. Also beginning February 1, 2008, principal payments on the equipment notes held for both series of certificates are due semi-annually until the balance of the certificates mature on August 1, 2022. Prior to their issuance, the Company also entered into swap agreements to hedge the variability in interest rates on the Pass Through Certificates. The swap agreements were accounted for as cash flow hedges, and resulted in a payment by the Company of $20 million upon issuance of the Pass Through Certificates. The effective portion of the hedge is being amortized to interest expense concurrent with the amortization of the debt and is reflected in the above table as a reduction in the debt balance. The ineffectiveness of the hedge transaction was immaterial.

During December 2006, the Company issued $300 million senior unsecured notes due December 15, 2016. The notes bear interest at 5.75 percent, payable semi-annually in arrears, with the first payment made on June 15, 2007. During fourth quarter 2009, the Company entered into a fixed-to-floating interest rate swap to convert the interest on these unsecured notes to a floating rate; however, the interest rate swap was terminated in 2015. See Note 10 for further information on the interest-rate swap agreement and termination.

During February 2005, the Company issued $300 million senior unsecured notes due 2017. The notes bear interest at 5.125 percent, payable semi-annually in arrears, with the first payment made on September 1, 2005.

In fourth quarter 2004, the Company entered into four identical 13-year floating-rate financing arrangements, whereby it borrowed a total of $112 million from French banking partnerships. Although the interest rates on the borrowings float, the Company estimated at inception that, considering the full effect of the “net present value benefits” included in the transactions, the effective economic yield over the 13-year term of the loans will be approximately LIBOR minus 45 basis points. Principal and interest are payable semi-annually on June 30 and December 31 for each of the loans, and the Company may terminate the arrangements in any year on either of those dates, under certain conditions. The Company pledged four aircraft as collateral for the transactions.

On February 28, 1997, the Company issued $100 million of senior unsecured 7.375% debentures due March 1, 2027. Interest is payable semi-annually on March 1 and September 1. The debentures may be redeemed, at the option of the Company, in whole at any time or in part from time to time, at a redemption price equal to the greater of the principal amount of the debentures plus accrued interest at the date of redemption or the sum of the present values of the remaining scheduled payments of principal and interest thereon, discounted to the date of redemption at the comparable treasury

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rate plus20 basis points, plus accrued interest at the date of redemption. In January 2007, the Company entered into an interest rate swap agreement to convert this fixed-rate debt to a floating rate; however, the interest rate swap was terminated in December 2012.

The Company is required to provide standby letters of credit to support certain obligations that arise in the ordinary course of business. Although the letters of credit are an off-balance sheet item, the majority of the obligations to which they relate are reflected as liabilities in the Consolidated Balance Sheet. Outstanding letters of credit totaled $184 million at December 31, 2015.

The net book value of the assets pledged as collateral for the Company’s secured borrowings, primarily aircraft and engines, was $1.9 billion at December 31, 2015. In addition, the Company has pledged a total of up to 88 of its Boeing 737-700 and 12 of its Boeing 737-800 aircraft at a net book value of $2.5 billion, in the case that it has obligations related to its fuel derivative instruments with counterparties that exceed certain thresholds. See Note 10 for further information on these collateral arrangements.

As of December 31, 2015, aggregate annual principal maturities of debt and capital leases (not including amounts associated with interest rate swap agreements, interest on capital leases, amortization of capital lease incentives, and amortization of purchase accounting adjustments) for the five-year period ending December 31, 2020, and thereafter, were $617 million in 2016, $528 million in 2017, $272 million in 2018, $522 million in 2019, $751 million in 2020, and $424 million thereafter.

7. LEASES

The Company's fleet included 28 aircraft on capital lease as of December 31, 2015, compared with 16 aircraft on capital lease, including two B717s, as of December 31, 2014. Amounts applicable to these aircraft that are included in property and equipment were:

(in millions)	2015		2014
Flight equipment	$	435	$	214
Less: accumulated amortization	29		22
	$	406	$	192

Total rental expense for operating leases, both aircraft and other, charged to operations in 2015, 2014, and 2013 was $909 million, $931 million, and $997 million, respectively. The majority of the Company’s terminal operations space, as well as 95 aircraft, were under operating leases at December 31, 2015. For aircraft operating leases and for terminal operations leases, expense is included in Aircraft rentals and in Landing fees and other rentals, respectively, in the Consolidated Statement of Income. Future minimum lease payments under capital leases and noncancelable operating leases and rentals to be received under subleases with initial or remaining terms in excess of one year at December 31, 2015, were:

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(in millions)	Capital leases		Operating leases		Subleases			LFMP facility lease*		Operating leases, net
2016	$	46	$	636	$	(103	)	$	24	$	557
2017	46		624		(103		)	24		545
2018	45		551		(102		)	25		474
2019	45		479		(97		)	25		407
2020	44		359		(78		)	26		307
Thereafter	209		961		(66		)	634		1,529
Total minimum lease payments	$	435	$	3,610	$	(549	)	$	758	$	3,819
Less amount representing interest	79
Present value of minimum lease payments	356
Less current portion	32
Long-term portion	$	324
* See Note 4 for further details

The aircraft leases generally can be renewed for one to five years at rates based on fair market value at the end of the lease term. Most aircraft leases have purchase options at or near the end of the lease term at fair market value, generally limited to a stated percentage of the lessor’s defined cost of the aircraft.

On July 9, 2012, the Company signed an agreement with Delta Air Lines, Inc. and Boeing Capital Corp. to lease or sublease all 88 of AirTran's B717s to Delta at agreed-upon lease rates. The first converted B717 was delivered to Delta in September 2013, and as of December 31, 2015, the Company had delivered a total of 87 B717s to Delta. As the Company previously announced, all B717s remaining at Southwest were grounded on December 28, 2014. The Company expects the one remaining B717 to be converted and delivered to Delta by early 2016. A total of 76 of the B717s are on operating lease, ten are owned, and two are on capital lease.

The Company paid the majority of the costs to convert the aircraft to the Delta livery and perform certain maintenance checks prior to the delivery of each aircraft. The agreement to pay these conversion and maintenance costs is a “lease incentive” under applicable accounting guidance. The sublease terms for the 76 B717s on operating lease and the two B717s on capital lease coincide with the Company's remaining lease terms for these aircraft from the original lessor, which range from approximately three to eight years. The leasing of the ten B717s that are owned by the Company is subject to certain conditions, and the lease terms are for up to seven years, after which Delta will have the option to purchase the aircraft at the then-prevailing market value. The ten owned B717s are accounted for as sales type leases, the two B717s classified by the Company as capital leases are accounted for as direct financing leases, and the remaining 76 subleases are accounted for as operating leases with Delta. With respect to the 87 B717s delivered to Delta as of December 31, 2015, the Company had 76 operating leases, nine sales type leases, and two direct financing leases. There are no contingent payments and no significant residual value conditions associated with the transaction.

The accounting for this transaction is based on the guidance provided for lease transactions. The Company recorded an initial charge of approximately $137 million during third quarter 2012, representing the remaining estimated cost, at the scheduled date of delivery of each B717 to Delta (including the conversion, maintenance, and other contractual costs to be incurred), of the Company's lease of the 76 B717s that are accounted for as operating leases, net of the future sublease income from Delta and the remaining unfavorable aircraft lease liability established as of the acquisition date. During 2014, the Company recorded an additional $22 million in expense for its revised estimate of conversion costs for these B717s, and an additional $9 million associated with the extension of time between when the Company removed the aircraft from revenue service, on December 28, 2014, and when they entered the conversion process. The charges recorded by the Company for this transaction were included as a component of Acquisition and integration costs in the Company's Consolidated Statement of Income and were included as a component of Other, net in Cash flows from operating activities in the Company's Consolidated Statement of Cash Flows, and the corresponding liability for this transaction is included as a component of Current liabilities and Other noncurrent liabilities in the Company's

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Consolidated Balance Sheet. A rollforward of the Company's B717 lease/sublease liability for 2015 and 2014 is shown below:

(in millions)	B717 lease/sublease liability
Balance at December 31, 2013	$	122
Lease/sublease accretion	5
Lease/sublease expense adjustment	22
Lease/sublease payments, net (a)	(86		)
Balance at December 31, 2014	$	63
Lease/sublease accretion	1
Lease/sublease expense adjustment	2
Lease/sublease payments, net (a)	(48		)
Balance at December 31, 2015	$	18

(a) Includes lease conversion cost payments

8. COMMON STOCK

The Company has one class of capital stock, its common stock. Holders of shares of common stock are entitled to receive dividends when and if declared by the Board of Directors and are entitled to one vote per share on all matters submitted to a vote of the Shareholders. At December 31, 2015, the Company had 60 million shares of common stock reserved for issuance pursuant to Employee equity plans (of which 33 million shares had not been granted) through various share-based compensation arrangements. See Note 9 to the Consolidated Financial Statements for information regarding the Company's equity plans.

9. STOCK PLANS

Share-based Compensation

The Company accounts for share-based compensation utilizing fair value, which is determined on the date of grant for all instruments. The Consolidated Statement of Income for the years ended December 31, 2015, 2014, and 2013, reflects share-based compensation expense of $29 million, $21 million, and $18 million, respectively. The total tax benefit recognized in earnings from share-based compensation arrangements for the years ended December 31, 2015, 2014, and 2013, was not material. As of December 31, 2015, there was $34 million of total unrecognized compensation cost related to share-based compensation arrangements, which is expected to be recognized over a weighted-average period of 1.9 years. The Company expects substantially all unvested awards to vest.

Restricted Stock Units and Stock Grants

Under the Company’s Amended and Restated 2007 Equity Incentive Plan (“2007 Equity Plan”), it granted restricted stock units (“RSUs”) to certain Employees during 2013, 2014, and 2015 and performance-based restricted stock units (“PBRSUs”) to certain Employees during 2014 and 2015. Outstanding RSUs vest over three years, subject generally to the individual’s continued employment or service. The Company recognizes all expense on a straight-line basis over the vesting period, with any changes in expense due to the number of PBRSUs expected to vest being modified on a prospective basis. The PBRSUs granted in May 2014 and February 2015 are subject to the Company’s performance with respect to a three-year simple average of Return on Invested Capital, before taxes and excluding special items ("ROIC"), for the defined performance period and the individual’s continued employment or service. The number of PBRSUs vesting on the vesting date will be interpolated based on the Company's ROIC performance and ranges from zero PBRSUs to 200 percent of granted PBRSUs.

Aggregated information regarding the Company’s RSUs and PBRSUs is summarized below:

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	All Restricted Stock Units
	Units (000)			Wtd. Average Fair Value (per share)
Outstanding December 31, 2012, Unvested	2,876			$	9.57
Granted	1,139			14.34
Vested	(1,263	)		10.24
Surrendered	(168	)		9.11
Outstanding December 31, 2013	2,584			11.38
Granted	834		(a)	24.93
Vested	(1,239	)		11.05
Surrendered	(102	)		13.18
Outstanding December 31, 2014	2,077			16.92
Granted	561		(b)	45.80
Vested	(1,095	)		13.33
Surrendered	(58	)		25.49
Outstanding December 31, 2015, Unvested	1,485			$	30.17

(a) Includes 198 thousand shares of PBRSUs

(b) Includes 183 thousand shares of PBRSUs

In addition, the Company granted approximately 28 thousand shares of unrestricted stock at a weighted average grant price of $41.27 in 2015, approximately 36 thousand shares at a weighted average grant price of $24.91 in 2014, and approximately 63 thousand shares at a weighted average grant price of $14.34 in 2013, to members of its Board of Directors.

A remaining balance of up to 23 million shares of the Company’s common stock may be issued pursuant to grants under the 2007 Equity Plan.

Stock Options

The Company has stock options outstanding, which were granted prior to 2013, with an exercise price equal to the fair value of the Company’s common stock on the date of grant. The Company determined fair value of stock options using the Black-Scholes option valuation model. As of December 31, 2015, there were 822 thousand outstanding stock option awards, all of which are vested and exercisable, with a weighted average exercise price of $13.44.

Employee Stock Purchase Plan

Under the amended 1991 Employee Stock Purchase Plan (ESPP), which has been approved by Shareholders, the Company is authorized to issue up to a remaining balance of 10 million shares of the Company’s common stock to Employees of the Company. These shares may be issued at a price equal to 90 percent of the market value at the end of each monthly purchase period. Common stock purchases are paid for through periodic payroll deductions. For the years ended December 31, 2015, 2014, and 2013, participants under the plan purchased 597 thousand shares, 792 thousand shares, and 1.5 million shares at average prices of $36.40, $23.17, and $12.03, respectively. The weighted-average fair value of each purchase right under the ESPP granted for the years ended December 31, 2015, 2014, and 2013, which is equal to the ten percent discount from the market value of the Common Stock at the end of each monthly purchase period, was $4.04, $2.68, and $1.34, respectively.

Taxes

A portion of the Company’s granted options qualify as incentive stock options for income tax purposes. As such, a tax benefit is not recorded at the time the compensation cost related to the options is recorded for book purposes due to the fact that an incentive stock option does not ordinarily result in a tax benefit unless there is a disqualifying disposition. Grants of non-qualified stock options result in the creation of a deferred tax asset, which is a temporary difference,

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until the time that the option is exercised. Due to the treatment of incentive stock options for tax purposes, the Company’s effective tax rate from year to year is subject to variability.

10. FINANCIAL DERIVATIVE INSTRUMENTS

Fuel Contracts

Airline operators are inherently dependent upon energy to operate and, therefore, are impacted by changes in jet fuel prices. Furthermore, jet fuel and oil typically represent one of the largest operating expenses for airlines. The Company endeavors to acquire jet fuel at the lowest possible cost and to reduce volatility in operating expenses through its fuel hedging program. Although the Company may periodically enter into jet fuel derivatives for short-term timeframes, because jet fuel is not widely traded on an organized futures exchange, there are limited opportunities to hedge directly in jet fuel for time horizons longer than approximately 24 months into the future. However, the Company has found that financial derivative instruments in other commodities, such as West Texas Intermediate (“WTI”) crude oil, Brent crude oil, and refined products, such as heating oil and unleaded gasoline, can be useful in decreasing its exposure to jet fuel price volatility. The Company does not purchase or hold any financial derivative instruments for trading or speculative purposes.

The Company has used financial derivative instruments for both short-term and long-term time frames, and primarily uses a mixture of purchased call options, collar structures (which include both a purchased call option and a sold put option), call spreads (which include a purchased call option and a sold call option), put spreads (which include a purchased put option and a sold put option), and fixed price swap agreements in its portfolio. Although the use of collar structures and swap agreements can reduce the overall cost of hedging, these instruments carry more risk than purchased call options in that the Company could end up in a liability position when the collar structure or swap agreement settles. With the use of purchased call options and call spreads, the Company cannot be in a liability position at settlement, but does not have coverage once market prices fall below the strike price of the purchased call option.

The Company evaluates its hedge volumes strictly from an “economic” standpoint and thus does not consider whether the hedges have qualified or will qualify for hedge accounting. The Company defines its “economic” hedge as the net volume of fuel derivative contracts held, including the impact of positions that have been offset through sold positions, regardless of whether those contracts qualify for hedge accounting. The level at which the Company is economically hedged for a particular period is also dependent on current market prices for that period, as well as the types of derivative instruments held and the strike prices of those instruments. For example, the Company may enter into “out-of-the-money” option contracts (including catastrophic protection), which may not generate intrinsic gains at settlement if market prices do not rise above the option strike price. Therefore, even though the Company may have an “economic” hedge in place for a particular period, that hedge may not produce any hedging gains at settlement and may even produce hedging losses depending on market prices, the types of instruments held, and the strike prices of those instruments.

For 2015, the Company had fuel derivative instruments in place for up to 15 percent of its fuel consumption. The Company also had fuel derivative instruments in place to provide coverage for up to 63 percent of its 2016 estimated fuel consumption, depending on where market prices settle. The following table provides information about the Company’s volume of fuel hedging for the years 2016 through 2018 on an “economic” basis considering current market prices:

	Fuel hedged as of
	December 31, 2015	Derivative underlying commodity type as of
Period (by year)	(gallons in millions) (a)	December 31, 2015
2016	1,226	Brent crude oil, Heating oil, and Gulf Coast jet fuel
2017	1,503	WTI crude and Brent crude oil
2018	731	Brent crude oil

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(a) Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place and may vary significantly as market prices fluctuate.

Upon proper qualification, the Company accounts for its fuel derivative instruments as cash flow hedges. Generally, utilizing hedge accounting, all periodic changes in fair value of the derivatives designated as hedges that are considered to be effective are recorded in Accumulated other comprehensive income (loss) ("AOCI") until the underlying jet fuel is consumed. See Note 12. The Company’s results are subject to the possibility that periodic changes will not be effective, as defined, or that the derivatives will no longer qualify for hedge accounting. Ineffectiveness results when the change in the fair value of the derivative instrument exceeds the change in the value of the Company’s expected future cash outlay to purchase and consume jet fuel. To the extent that the periodic changes in the fair value of the derivatives are ineffective, the ineffective portion is recorded to Other (gains) losses, net, in the Consolidated Statement of Income. Likewise, if a hedge ceases to qualify for hedge accounting, any change in the fair value of derivative instruments since the last reporting period is recorded to Other (gains) losses, net, in the Consolidated Statement of Income in the period of the change; however, any amounts previously recorded to AOCI would remain there until such time as the original forecasted transaction occurs, at which time these amounts would be reclassified to Fuel and oil expense. When the Company has sold derivative positions in order to effectively “close” or offset a derivative already held as part of its fuel derivative instrument portfolio, any subsequent changes in fair value of those positions are marked to market through earnings. Likewise, any changes in fair value of those positions that were offset by entering into the sold positions and were de-designated as hedges are concurrently marked to market through earnings. However, any changes in value related to hedges that were deferred as part of AOCI while designated as a hedge would remain until the originally forecasted transaction occurs. In a situation where it becomes probable that a fuel hedged forecasted transaction will not occur, any gains and/or losses that have been recorded to AOCI would be required to be immediately reclassified into earnings. The Company did not have any such situations occur during 2013, 2014, or 2015.

In some situations, an entire commodity type used in hedging may cease to qualify for special hedge accounting treatment. As an example, from July 2013 to July 2015, the Company's routine statistical analysis performed to determine which commodities qualified for special hedge accounting treatment on a prospective basis dictated that WTI crude oil based derivatives no longer qualified for hedge accounting. This was primarily due to the fact that the correlation between WTI crude oil prices and jet fuel prices fell below established thresholds, and therefore the Company could no longer demonstrate that derivatives based on WTI crude oil prices would result in effective hedges on a prospective basis. As such, the changes in fair value of all of the Company's derivatives based in WTI were recorded directly to Other (gains) losses. The Company's routine statistical analysis performed during second half 2015, dictated that WTI crude oil based derivatives again qualified for hedge accounting.

Ineffectiveness is inherent in hedging jet fuel with derivative positions based in other crude oil related commodities. Due to the volatility in markets for crude oil and related products, the Company is unable to predict the amount of ineffectiveness each period, including the loss of hedge accounting, which could be determined on a derivative by derivative basis or in the aggregate for a specific commodity. This may result, and has resulted, in increased volatility in the Company’s financial results. Factors that have and may continue to lead to ineffectiveness and unrealized gains and losses on derivative contracts include: significant fluctuation in energy prices, the number of derivative positions the Company holds, significant weather events affecting refinery capacity and the production of refined products, and the volatility of the different types of products the Company uses in hedging. However, even though derivatives may not qualify for hedge accounting, the Company continues to hold the instruments as management believes derivative instruments continue to afford the Company the opportunity to stabilize jet fuel costs.

Accounting pronouncements pertaining to derivative instruments and hedging are complex with stringent requirements, including the documentation of a Company hedging strategy, statistical analysis to qualify a commodity for hedge accounting both on a historical and a prospective basis, and strict contemporaneous documentation that is required at the time each hedge is designated by the Company. The Company also examines the effectiveness of each individual hedge and its entire hedging program on a quarterly basis utilizing statistical analysis. This analysis involves utilizing regression and other statistical analyses that compare changes in the price of jet fuel to changes in the prices of the commodities used for hedging purposes.

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All cash flows associated with purchasing and selling fuel derivatives are classified as Other operating cash flows in the Consolidated Statement of Cash Flows. The following table presents the location of all assets and liabilities associated with the Company’s hedging instruments within the Consolidated Balance Sheet:

		Asset derivatives				Liability derivatives
	Balance Sheet	Fair value at		Fair value at		Fair value at		Fair value at
(in millions)	location	12/31/2015		12/31/2014		12/31/2015		12/31/2014
Derivatives designated as hedges*
Fuel derivative contracts (gross)	Prepaid expenses and other current assets	$	2	$	—	$	—	$	—
Fuel derivative contracts (gross)	Other assets	2		—		—		—
Fuel derivative contracts (gross)	Accrued liabilities	107		—		526		—
Fuel derivative contracts (gross)	Other noncurrent liabilities	55		—		658		643
Interest rate derivative contracts	Other assets	2		13		—		—
Interest rate derivative contracts	Other noncurrent liabilities	—		—		49		61
Total derivatives designated as hedges		$	168	$	13	$	1,233	$	704
Derivatives not designated as hedges*
Fuel derivative contracts (gross)	Prepaid expenses and other current assets	$	39	$	—	$	26	$	—
Fuel derivative contracts (gross)	Other assets	5		—		—		—
Fuel derivative contracts (gross)	Accrued liabilities	1,395		1,190		1,854		1,432
Fuel derivative contracts (gross)	Other noncurrent liabilities	330		157		352		273
Total derivatives not designated as hedges		$	1,769	$	1,347	$	2,232	$	1,705
Total derivatives		$	1,937	$	1,360	$	3,465	$	2,409

* Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.

In addition, the Company also had the following amounts associated with fuel derivative instruments and hedging activities in its Consolidated Balance Sheet:

	Balance Sheet	December 31,		December 31,
(in millions)	location	2015		2014
Cash collateral deposits provided to counterparties for fuel   contracts - current	Offset against Accrued liabilities	$	235	$	68
Cash collateral deposits provided to counterparties for fuel   contracts- noncurrent	Offset against Other noncurrent liabilities	600		198
Due to third parties for fuel contracts	Accrued liabilities	46		16

All of the Company's fuel derivative instruments and interest rate swaps are subject to agreements that follow the netting guidance in the applicable accounting for derivatives and hedging. The types of derivative instruments the Company has determined are subject to netting requirements in the accompanying Consolidated Balance Sheet are those in which the Company pays or receives cash for transactions with the same counterparty and in the same currency

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via one net payment or receipt. For cash collateral held by the Company or provided to counterparties, the Company nets such amounts against the fair value of the Company's derivative portfolio by each counterparty. The Company has elected to utilize netting for both its fuel derivative instruments and interest rate swap agreements and also classifies such amounts as either current or noncurrent, based on the net fair value position with each of the Company's counterparties in the Consolidated Balance Sheet.

The Company's application of its netting policy associated with cash collateral differs depending on whether its derivative instruments are in a net asset position or a net liability position. If its fuel derivative instruments are in a net asset position with a counterparty, cash collateral amounts held are first netted against current outstanding derivative amounts associated with that counterparty until that balance is zero, and then any remainder is applied against the fair value of noncurrent outstanding derivative instruments. If the Company's fuel derivative instruments are in a net liability position with the counterparty, cash collateral amounts provided are first netted against noncurrent outstanding derivative amounts associated with that counterparty until that balance is zero, and then any remainder is applied against the fair value of current outstanding derivative instruments.

The Company has the following recognized financial assets and financial liabilities resulting from those transactions that meet the scope of the disclosure requirements as necessitated by applicable accounting guidance for balance sheet offsetting:

Offsetting of derivative assets
(in millions)
		(i)		(ii)			(iii) = (i) + (ii)		(i)		(ii)			(iii) = (i) + (ii)
		December 31, 2015							December 31, 2014
Description	Balance Sheet location	Gross amounts of recognized assets		Gross amounts offset in the Balance Sheet			Net amounts of assets presented in the Balance Sheet (a)		Gross amounts of recognized assets		Gross amounts offset in the Balance Sheet			Net amounts of assets presented in the Balance Sheet (a)
Fuel derivative contracts	Prepaid expenses and other current assets	$	41	$	(26	)	$	15	$	—	$	—		$	—
Fuel derivative contracts	Other assets	$	7	$	—		$	7	$	—	$	—		$	—
Fuel derivative contracts	Accrued liabilities	$	1,737	$	(1,737	)	$	—	$	1,258	$	(1,258	)	$	—
Fuel derivative contracts	Other noncurrent liabilities	$	985	$	(985	)	$	—	$	355	$	(355	)	$	—
Interest rate derivative contracts	Other assets	$	2	$	—		$	2	$	13	$	—		$	13

(a) The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

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		(i)		(ii)			(iii) = (i) + (ii)		(i)		(ii)			(iii) = (i) + (ii)
		December 31, 2015							December 31, 2014
Description	Balance Sheet location	Gross amounts of recognized liabilities		Gross amounts offset in the Balance Sheet			Net amounts of liabilities presented in the Balance Sheet (a)		Gross amounts of recognized liabilities		Gross amounts offset in the Balance Sheet			Net amounts of liabilities presented in the Balance Sheet (a)
Fuel derivative contracts	Prepaid expenses and other current assets	$	26	$	(26	)	$	—	$	—	$	—		$	—
Fuel derivative contracts	Accrued liabilities	$	2,380	$	(1,737	)	$	643	$	1,432	$	(1,258	)	$	174
Fuel derivative contracts	Other noncurrent liabilities	$	1,010	$	(985	)	$	25	$	916	$	(355	)	$	561
Interest rate derivative contracts	Other noncurrent liabilities	$	49	$	—		$	49	$	61	$	—		$	61

(a) The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

The following tables present the impact of derivative instruments and their location within the Consolidated Statement of Income for the year endedDecember 31, 2015 and 2014:

Derivatives in cash flow hedging relationships
	(Gain) loss recognized in AOCI on derivatives (effective portion)						(Gain) loss reclassified from AOCI into income (effective portion)(a)						(Gain) loss recognized in income on derivatives (ineffective portion)(b)
	Year ended						Year ended						Year ended
	December 31,						December 31,						December 31,
(in millions)	2015			2014			2015			2014			2015			2014
Fuel derivative contracts	$	546	*	$	749	*	$	238	*	$	22	*	$	(9	)	$	7
Interest rate derivatives	4		*	6		*	13		*	14		*	(4		)	(4		)
Total	$	550		$	755		$	251		$	36		$	(13	)	$	3

*Net of tax

(a) Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.

(b) Amounts are included in Other (gains) losses, net.

Derivatives not in cash flow hedging relationships
	(Gain) loss
	recognized in income on
	derivatives
	Year ended				Location of (gain) loss
	December 31,				recognized in income
(in millions)	2015		2014		on derivatives
Fuel derivative contracts	$	444	$	244	Other (gains) losses, net

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The Company also recorded expense associated with premiums paid for fuel derivative contracts that settled/expired during 2015, 2014, and 2013 of $124 million, $62 million, and $60 million, respectively. These amounts are excluded from the Company’s measurement of effectiveness for related hedges and are included as a component of Other (gains) losses, net, in the Consolidated Statement of Income.

The fair values of the derivative instruments, depending on the type of instrument, were determined by the use of present value methods or option value models with assumptions about commodity prices based on those observed in underlying markets or provided by third parties. Included in the Company’s cumulative net unrealized losses from fuel hedges as of December 31, 2015, recorded in AOCI, were approximately $620 million in unrealized losses, net of taxes, which are expected to be realized in earnings during the twelve months subsequent to December 31, 2015.

Interest Rate Swaps

The Company is party to certain interest rate swap agreements that are accounted for as either fair value hedges or cash flow hedges, as defined in the applicable accounting guidance for derivative instruments and hedging. Several of the Company's interest rate swap agreements qualify for the “shortcut” method of accounting for hedges, which dictates that the hedges are assumed to be perfectly effective, and, thus, there is no ineffectiveness to be recorded in earnings. For the Company’s interest rate swap agreements that do not qualify for the "shortcut" method of accounting, ineffectiveness is required to be measured at each reporting period. The ineffectiveness associated with all of the Company’s, including AirTran Holdings', interest rate swap agreements for all periods presented was not material.

The Company has floating-to-fixed interest rate swap agreements associated with its $600 million floating-rate term loan agreement due 2020 and its $332 million term loan agreement due 2019 that are accounted for as cash flow hedges. These interest rate hedges have fixed the interest rate on the $600 million floating-rate term loan agreement at 5.223 percent until maturity, and for the $332 million term loan agreement at 6.315 percent until maturity.

The fair values of the interest rate swap agreements, which are adjusted regularly, have been aggregated by counterparty for classification in the Consolidated Balance Sheet. Agreements totaling an asset of $2 million are fair value hedges and are classified as a component of Other assets. The corresponding adjustment related to the net asset associated with the Company’s fair value hedges is to the carrying value of the long-term debt. Agreements totaling a net liability of $49 million are fair value hedges and cash flow hedges and are classified as a component of Other noncurrent liabilities. The corresponding adjustment related to the net liability associated with the Company’s cash flow hedges is to AOCI and fair value hedges is to the carrying value of the long-term debt. See Note 12.

There are also a number of interest rate swap agreements, which convert a portion of AirTran Holdings' floating-rate debt to a fixed-rate basis for the remaining life of the debt, thus reducing the impact of interest rate changes on future interest expense and cash flows. Under these agreements, which expire between 2016 and 2020, it pays fixed rates between 4.35 percent and 6.435 percent and receives either three-month or six-month LIBOR on the notional values. The notional amount of outstanding debt related to interest rate swaps as of December 31, 2015, was $208 million. These interest rate swap arrangements were designated as cash flow hedges as of the acquisition date. The ineffectiveness associated with all of the Company’s interest rate cash flow hedges for all periods presented was not material.

During 2015, the Company terminated the fixed-to-floating interest rate swap agreements related to its$300 million5.75% unsecured notes due 2016. The effect of this termination is such that the interest associated with the debt prospectively reverts back to its original fixed rate. As a result of the approximate $12 million gain realized on this transaction, which will be amortized over the remaining term of the corresponding unsecured notes, and based on projected interest rates at the date of termination, the Company does not believe its future interest expense associated with these unsecured notes will significantly differ from the expense it would have recorded had the unsecured notes remained at floating rates.

During fourth quarter 2015, the Company entered into an interest rate swap agreement related to its $500 million2.65% Notes due 2020. The primary objective for the Company's use of this interest rate hedge was to reduce the volatility

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of net interest expense by better matching the repricing of its assets and liabilities. Under this interest rate swap agreement, the Company pays LIBOR plus a margin every six months on the notional amount of the debt, and receives payments based on the fixed stated rate of the notes every six months until the date the notes become due. This interest rate swap agreement qualifies as a fair value hedge. As a result of the fixed-to-floating interest rate swap agreement in place, the average floating rate recognized during 2015 was approximately 1.94 percent, based on actual and forward rates as of December 31, 2015.

The Company also has fixed-to-floating interest rate swap agreements in place associated with its $300 million2.75% Notes due 2019 that are accounted for as fair value hedges. As a result of the fixed-to-floating interest rate swap agreements in place, the average floating rate recognized during 2015 was approximately 1.27 percent, based on actual and forward rates as of December 31, 2015.

Credit Risk and Collateral

Credit exposure related to fuel derivative instruments is represented by the fair value of contracts that are an asset to the Company at the reporting date. At such times, these outstanding instruments expose the Company to credit loss in the event of nonperformance by the counterparties to the agreements. However, the Company has not experienced any significant credit loss as a result of counterparty nonperformance in the past. To manage credit risk, the Company selects and periodically reviews counterparties based on credit ratings, limits its exposure with respect to each counterparty, and monitors the market position of the fuel hedging program and its relative market position with each counterparty. At December 31, 2015, the Company had agreements with all of its active counterparties containing early termination rights and/or bilateral collateral provisions whereby security is required if market risk exposure exceeds a specified threshold amount based on the counterparty credit rating. The Company also had agreements with counterparties in which cash deposits, letters of credit, and/or pledged aircraft are required to be posted whenever the net fair value of derivatives associated with those counterparties exceeds specific thresholds. The following table provides the fair values of fuel derivatives, amounts posted as collateral, and applicable collateral posting threshold amounts as of December 31, 2015, at which such postings are triggered:

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	Counterparty (CP)
(in millions)	A			B			C			D			E			F		Other(a)		Total
Fair value of fuel derivatives	$	(562	)	$	(201	)	$	(176	)	$	(411	)	$	(159	)	$	20	$	8	$	(1,481	)
Cash collateral held (by) CP	(284		)	(159		)	(56		)	(299		)	(37		)	—		—		(835		)
Aircraft collateral pledged to CP	(250		)	—			—			—			—			—		—		(250		)
Letters of credit (LC)	—			—			—			—			—			—		—		—
Option to substitute LC for aircraft	(200) to (600)(h)			(100) to (500)(d)			N/A			(150) to (550)(d)			(150) to (550)(d)			N/A
Option to substitute LC for cash	N/A			>(500)(e)			(225) to (275)(e)			(75) to (150) or >(550)(e)			(125) to (150) or >(550)(e)			(g)
If credit rating is investment grade, fair value of fuel derivative level at which:
Cash is provided to CP	(50) to (200) or >(600)			(50) to (100) or >(500)			>(125)			(75) to (150) or >(550)			(125) to (150) or >(550)			>(100)
Cash is received from CP	>50			>150			>175(c)			>250			>75			>0
Aircraft or cash can be pledged to   CP as collateral	(200) to (600)(f)			(100) to (500)(d)			N/A			(150) to (550)(d)			(150) to (550)(d)			N/A
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Cash is provided to CP	(0) to (200) or >(600)			(0) to (100) or >(500)			(b)			(0) to (150) or >(550)			(0) to (150) or >(550)			(b)
Cash is received from CP	(b)			(b)			(b)			(b)			(b)			(b)
Aircraft or cash can be pledged to   CP as collateral	(200) to (600)			(100) to (500)			N/A			(150) to (550)			(150) to (550)			N/A

(a) Individual counterparties with fair value of fuel derivatives <$10 million.

(b) Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.

(c) Thresholds may vary based on changes in credit ratings within investment grade.

(d) The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.

(e) The Company has the option of providing cash or letters of credit as collateral.

(f) The Company has the option of providing cash or pledging aircraft as collateral.

(g) The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.

(h) The Company has the option of providing letters of credit in addition to aircraft collateral if the appraised value of the aircraft does not meet the collateral requirement.

11. FAIR VALUE MEASUREMENTS

Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

As of December 31, 2015, the Company held certain items that are required to be measured at fair value on a recurring basis. These included cash equivalents, short-term investments (primarily treasury bills and certificates of deposit), interest rate derivative contracts, fuel derivative contracts, and available-for-sale securities. The majority of the Company’s short-term investments consist of instruments classified as Level 1. However, the Company has certificates of deposit, commercial paper, and Eurodollar time deposits that are classified as Level 2, due to the fact that the fair value for these instruments is determined utilizing observable inputs in non-active markets. Other available-for-sale securities primarily consist of investments associated with the Company’s excess benefit plan.

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The Company’s fuel and interest rate derivative instruments consist of over-the-counter contracts, which are not traded on a public exchange. Fuel derivative instruments include swaps, as well as different types of option contracts, whereas interest rate derivatives consist solely of swap agreements. See Note 10 for further information on the Company’s derivative instruments and hedging activities. The fair values of swap contracts 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 has categorized these swap contracts as Level 2. The Company’s Treasury Department, which reports to the Chief Financial Officer, determines the value of option contracts utilizing an option pricing model based on inputs that are either readily available in public markets, can be derived from information available in publicly quoted markets, or are provided by financial institutions that trade these contracts. The option pricing model used by the Company is an industry standard model for valuing options and is the same model used by the broker/dealer community (i.e., the Company’s counterparties). The inputs to this option pricing model are the option strike price, underlying price, risk free rate of interest, time to expiration, and volatility. Because certain inputs used to determine the fair value of option contracts are unobservable (principally implied volatility), the Company has categorized these option contracts as Level 3. Volatility information is obtained from external sources, but is analyzed by the Company for reasonableness and compared to similar information received from other external sources. The fair value of option contracts considers both the intrinsic value and any remaining time value associated with those derivatives that have not yet settled. The Company also considers counterparty credit risk and its own credit risk in its determination of all estimated fair values. To validate the reasonableness of the Company’s option pricing model, on a monthly basis, the Company compares its option valuations to third party valuations. If any significant differences were to be noted, they would be researched in order to determine the reason. However, historically, no significant differences have been noted. 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.

Included in Other available-for-sale securities are the Company's investments associated with its excess benefit plan which consist of mutual funds that are publicly traded and for which market prices are readily available. This plan is a non-qualified deferred compensation plan designed to hold Employee contributions in excess of limits established by Section 415 of the Internal Revenue Code of 1986, as amended. Payments under this plan are made based on the participant's distribution election and plan balance. Assets related to the funded portion of the deferred compensation plan are held in a rabbi trust, and the Company remains liable to these participants for the unfunded portion of the plan. The Company records changes in the fair value of the asset in the Company's earnings.

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The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis at December 31, 2015, and December 31, 2014:

				Fair value measurements at reporting date using:
				Quoted prices in active markets for identical assets		Significant other observable inputs			Significant unobservable inputs
Description	December 31, 2015			(Level 1)		(Level 2)			(Level 3)
Assets	(in millions)
Cash equivalents
Cash equivalents (a)	$	1,337		$	1,337	$	—		$	—
Commercial paper	200			—		200			—
Certificates of deposit	13			—		13			—
Eurodollar Time Deposits	33			—		33			—
Short-term investments:
Treasury bills	1,248			1,248		—			—
Certificates of deposit	220			—		220			—
Interest rate derivatives (see Note 10)	2			—		2			—
Fuel derivatives:
Swap contracts (b)	38			—		38			—
Swap contracts (c)	931			—		931			—
Option contracts (b)	10			—		—			10
Option contracts (c)	956			—		—			956
Other available-for-sale securities	93			66		—			27
Total assets	$	5,081		$	2,651	$	1,437		$	993
Liabilities
Fuel derivatives:
Swap contracts (c)	$	(774	)	$	—	$	(774	)	$	—
Option contracts (b)	(26		)	—		—			(26		)
Option contracts (c)	(2,616		)	—		—			(2,616		)
Interest rate derivatives (see Note 10)	(49		)	—		(49		)	—
Total liabilities	$	(3,465	)	$	—	$	(823	)	$	(2,642	)

(a) Cash equivalents are primarily composed of money market investments.

(b) In the Consolidated Balance Sheet amounts are presented as a net asset. See Note 10.

(c) In the Consolidated Balance Sheet amounts are presented as a net liability. See Note 10.

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				Fair value measurements at reporting date using:
				Quoted prices in active markets for identical assets		Significant other observable inputs			Significant unobservable inputs
Description	December 31, 2014			(Level 1)		(Level 2)			(Level 3)
Assets	(in millions)
Cash equivalents
Cash equivalents (a)	$	1,110		$	1,110	$	—		$	—
Commercial paper	70			—		70			—
Certificates of deposit	4			—		4			—
Eurodollar Time Deposits	98			—		98			—
Short-term investments:
Treasury bills	1,450			1,450		—			—
Certificates of deposit	256			—		256			—
Interest rate derivatives (see Note 10)	13			—		13			—
Fuel derivatives:
Swap contracts (b)	455			—		455			—
Option contracts (b)	892			—		—			892
Other available-for-sale securities	95			63		—			32
Total assets	$	4,443		$	2,623	$	896		$	924
Liabilities
Fuel derivatives:
Swap contracts (b)	$	(365	)	$	—	$	(365	)	$	—
Option contracts (b)	(1,983		)	—		—			(1,983		)
Interest rate derivatives (see Note 10)	(61		)	—		(61		)	—
Total liabilities	$	(2,409	)	$	—	$	(426	)	$	(1,983	)

(a) Cash equivalents are primarily composed of money market investments.

(b) In the Consolidated Balance Sheet amounts are presented as a net liability. See Note 10.

The Company had no transfers of assets or liabilities between any of the above levels during the years ended December 31, 2015 or 2014. The Company did not have any assets or liabilities measured at fair value on a nonrecurring basis as of December 31, 2015 or 2014. The following tables present the Company’s activity for items measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for 2015 and 2014:

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	Fair value measurements using significant unobservable inputs (Level 3)
	Fuel				Other
(in millions)	derivatives				securities			Total
Balance at December 31, 2014	$	(1,091	)		$	32		$	(1,059	)
Total losses (realized or unrealized)
Included in earnings	(646		)		(1		)	(647		)
Included in other comprehensive income	(858		)		—			(858		)
Purchases	750			(a)	—			750
Sales	(196		)	(a)	(4		)	(200		)
Settlements	365				—			365
Balance at December 31, 2015	$	(1,676	)		$	27		$	(1,649	)
The amount of total losses for the period   included in earnings attributable to the   change in unrealized gains or losses relating   to assets still held at December 31, 2015	$	(428	)		$	—		$	(428	)

(a) The purchase and sale of fuel derivatives are recorded gross based on the structure of the derivative instrument and

whether a contract with multiple derivatives is purchased as a single instrument or separate instruments.

	Fair value measurements using significant unobservable inputs (Level 3)
	Fuel				Other
(in millions)	derivatives				securities			Total
Balance at December 31, 2013	$	172			$	44		$	216
Total gains or (losses) (realized or unrealized)
Included in earnings	(439		)		—			(439		)
Included in other comprehensive income	(1,091		)		3			(1,088		)
Purchases	403			(a)	—			403
Sales	(155		)	(a)	(15		)	(170		)
Settlements	19				—			19
Balance at December 31, 2014	$	(1,091	)		$	32		$	(1,059	)
The amount of total losses for the period   included in earnings attributable to the   change in unrealized gains or losses relating   to assets still held at December 31, 2014	$	(450	)		$	—		$	(450	)

(a) The purchase and sale of fuel derivatives are recorded gross based on the structure of the derivative instrument and

whether a contract with multiple derivatives is purchased as a single instrument or separate instruments.

The significant unobservable input used in the fair value measurement of the Company’s derivative option contracts is implied volatility. Holding other inputs constant, a significant increase (decrease) in implied volatility would result in a significantly higher (lower) fair value measurement, respectively, for the Company’s derivative option contracts.

The following table presents a range of the unobservable inputs utilized in the fair value measurements of the Company’s fuel derivatives classified as Level 3 at December 31, 2015:

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Quantitative information about Level 3 fair value measurements
	Valuation technique	Unobservable input	Period (by year)	Range
Fuel derivatives	Option model	Implied volatility	2016	26-47%
			2017	25-37%
			2018	16-31%

The carrying amounts and estimated fair values of the Company’s long-term debt (including current maturities), as well as the applicable fair value hierarchy tier, at December 31, 2015, are presented in the table below. The fair values of the Company’s publicly held long-term debt 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 has categorized these agreements as Level 2. Six of the Company’s debt agreements are not publicly held. The Company has determined the estimated fair value of this debt to be Level 3, as certain inputs used to determine the fair value of these agreements are unobservable. The Company utilizes indicative pricing from counterparties and a discounted cash flow method to estimate the fair value of the Level 3 items.

(in millions)	Carrying value		Estimated fair value		Fair value level hierarchy
5.75% Notes due 2016	$	307	$	319	Level 2
5.25% Convertible Senior Notes due 2016	111		324		Level 2
5.125% Notes due 2017	309		321		Level 2
French Credit Agreements due 2018 - 1.53%	25		25		Level 3
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02%	17		17		Level 3
2.75% Notes due 2019	303		307		Level 2
Term Loan Agreement due 2019 - 6.315%	143		147		Level 3
Term Loan Agreement due 2019 - 4.84%	36		37		Level 3
2.65% Notes due 2020	494		493		Level 2
Term Loan Agreement due 2020 - 5.223%	329		323		Level 3
Floating-rate 737 Aircraft Notes payable through 2020	257		253		Level 3
Pass Through Certificates due 2022 - 6.24%	340		382		Level 2
7.375% Debentures due 2027	132		154		Level 2

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12. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

Comprehensive income includes changes in the fair value of certain financial derivative instruments that qualify for hedge accounting, unrealized gains and losses on certain investments, and actuarial gains/losses arising from the Company’s postretirement benefit obligation. A rollforward of the amounts included in AOCI, net of taxes, is shown below for 2015 and 2014:

(in millions)	Fuel derivatives			Interest rate derivatives			Defined benefit plan items			Other			Deferred tax impact		Accumulated other comprehensive income (loss)
Balance at December 31, 2013	$	(20	)	$	(58	)	$	65		$	8		$	2	$	(3	)
Changes in fair value	(1,191		)	(10		)	(24		)	—			454		(771		)
Reclassification to earnings	34			23			—			—			(21)		36
Balance at December 31, 2014	$	(1,177	)	$	(45	)	$	41		$	8		$	435	$	(738	)
Changes in fair value	(867		)	(5		)	(19		)	(2		)	329		(564		)
Reclassification to earnings	378			20			—			—			(147)		251
Balance at December 31, 2015	$	(1,666	)	$	(30	)	$	22		$	6		$	617	$	(1,051	)

The following table illustrates the significant amounts reclassified out of each component of AOCI for the year endedDecember 31, 2015:

Year ended December 31, 2015
(in millions)	Amounts reclassified from AOCI		Affected line item in the Consolidated Statement of Comprehensive Income
AOCI components
Unrealized loss on fuel derivative instruments	$	378	Fuel and oil expense
	140		Less: Tax expense
	$	238	Net of tax
Unrealized loss on interest rate derivative instruments	$	20	Interest expense
	7		Less: Tax expense
	$	13	Net of tax
Total reclassifications for the period	$	251	Net of tax

13. EMPLOYEE RETIREMENT PLANS

Defined Contribution Plans

Southwest has defined contribution plans covering substantially all of its Employees. Contributions under all defined contribution plans are primarily based on Employee compensation and performance of the Company. The Company sponsors Employee savings plans under section 401(k) of the Internal Revenue Code of 1986, as amended, which include Company matching contributions. In addition, the Southwest Airlines Co. ProfitSharing Plan (ProfitSharing Plan) is a defined contribution plan to which the Company may contribute a percentage of its eligible pre-tax profits, as defined, on an annual basis. No Employee contributions to the ProfitSharing Plan are allowed.

Company contributions to all defined contribution plans expensed in 2015, 2014, and 2013, reflected as a component of Salaries, wages, and benefits, were $945 million, $644 million, and $497 million, respectively.

Postretirement Benefit Plans

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The Company provides postretirement benefits to qualified retirees in the form of medical and dental coverage. Employees must meet minimum levels of service and age requirements as set forth by the Company, or as specified in collective-bargaining agreements with specific workgroups. Employees meeting these requirements, as defined, may use accrued unused sick time to pay for medical and dental premiums from the age of retirement until age 65.

The following table shows the change in the accumulated postretirement benefit obligation (APBO) for the years ended December 31, 2015 and 2014:

(in millions)	2015			2014
APBO at beginning of period	$	169		$	138
Service cost	11			10
Interest cost	7			7
Benefits paid	(6		)	(4		)
Actuarial loss	20			21
Settlements	$	—		$	(3	)
APBO at end of period	$	201		$	169

All plans are unfunded, and benefits are paid as they become due. Estimated future benefit payments expected to be paid are $5 million in 2016, $6 million in 2017, $7 million in 2018, $8 million in 2019, $9 million in 2020, and $71 million for the next five years thereafter.

The funded status (the difference between the fair value of plan assets and the projected benefit obligations) of the Company’s consolidated benefit plans are recognized in the Consolidated Balance Sheet, with a corresponding adjustment to AOCI. The following table reconciles the funded status of the plans to the accrued postretirement benefit cost recognized in Other non-current liabilities on the Company’s Consolidated Balance Sheet at December 31, 2015 and 2014.

(in millions)	2015			2014
Funded status	$	(201	)	$	(169	)
Unrecognized net actuarial gain	(31		)	(53		)
Unrecognized prior service cost	9			12
Accumulated other comprehensive income	22			41
Cost recognized on Consolidated Balance Sheet	$	(201	)	$	(169	)

The consolidated periodic postretirement benefit cost for the years ended December 31, 2015, 2014, and 2013, included the following:

(in millions)	2015			2014			2013
Service cost	$	11		$	10		$	30
Interest cost	7			7			4
Amortization of prior service cost	3			3			3
Recognized actuarial gain	(3		)	(4		)	(4		)
Settlements	$	—		$	(1	)	$	—
Net periodic postretirement benefit cost	$	18		$	15		$	33

Unrecognized prior service cost is expensed using a straight-line amortization of the cost over the average future service of Employees expected to receive benefits under the plans. Actuarial gains are amortized utilizing the minimum amortization method. The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31,2015, 2014, and 2013:

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	2015		2014		2013
Weighted-average discount rate	4.50	%	4.10	%	5.05	%
Assumed healthcare cost trend rate (1)	7.08	%	6.88	%	7.50	%

(1) The assumed healthcare cost trend rate is assumed to remain at 7.08% for 2016, then decline gradually to 5.19% by 2026 and remain level thereafter.

The assumed healthcare cost trend rates have a significant effect on the amounts reported for the consolidated postretirement plans. A one percent change in all healthcare cost trend rates used in measuring the APBO at December 31, 2015, would have the following effects:

(in millions)	1% increase		1% decrease
Increase (decrease) in total service and interest costs	$	3	$	(2	)
Increase (decrease) in the APBO	$	29	$	(24	)

The selection of a discount rate is made annually and is selected by the Company based upon comparison of the expected future cash flows associated with the Company’s future payments under its consolidated postretirement obligations to a yield curve created using high quality bonds that closely match those expected future cash flows. This rate increased during 2015 due to market conditions. The assumed healthcare trend rate is also reviewed at least annually and is determined based upon both historical experience with the Company’s healthcare benefits paid and expectations of how those trends may or may not change in future years.

14. INCOME TAXES

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The components of deferred tax assets and liabilities at December 31, 2015 and 2014, are as follows:

(in millions)	2015		2014
DEFERRED TAX LIABILITIES:
Accelerated depreciation	$	4,429	$	4,277
Other	62		51
Total deferred tax liabilities	4,491		4,328
DEFERRED TAX ASSETS:
Fuel derivative instruments	750		521
Capital and operating leases	81		125
Construction obligation	289		209
Accrued engine maintenance	74		83
Accrued employee benefits	541		334
State taxes	62		65
Business partner income	107		90
Other	97		119
Total deferred tax assets	2,001		1,546
Net deferred tax liability	$	2,490	$	2,782

The provision for income taxes is composed of the following:

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(in millions)	2015			2014		2013
CURRENT:
Federal	$	1,292		$	203	$	355
State	114			29		44
Total current	1,406			232		399
DEFERRED:
Federal	(97		)	421		62
State	(11		)	27		(6		)
Total deferred	(108		)	448		56
	$	1,298		$	680	$	455

The effective tax rate on income before income taxes differed from the federal income tax statutory rate for the following reasons:

(in millions)	2015			2014			2013
Tax at statutory U.S. tax rates	$	1,218		$	636		$	423
Nondeductible items	15			9			10
State income taxes, net of federal benefit	66			37			25
Other, net	(1		)	(2		)	(3		)
Total income tax provision	$	1,298		$	680		$	455

The only periods subject to examination for the Company’s federal tax return are the 2014 and 2015 tax years.

107

Report of Independent Registered Public Accounting Firm

The Board of Directors and Shareholders

Southwest Airlines Co.

We have audited the accompanying consolidated balance sheet of Southwest Airlines Co. as of December 31, 2015 and 2014, and the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2015. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Southwest Airlines Co. at December 31, 2015 and 2014, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2015, in conformity with U.S. generally accepted accounting principles.

As discussed in Note 1 to the consolidated financial statements, the Company has changed its method of accounting for its co-brand credit card agreement to apply the amendments to the FASB Accounting Standards Codification resulting from Accounting Standards Update No. 2009-13, Multiple Deliverable Revenue Arrangements, effective July 1, 2015.

As discussed in Note 1 to the consolidated financial statements, the Company has adopted ASU 2015-17 Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Southwest Airlines Co.’s internal control over financial reporting as of December 31, 2015, 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 2, 2016 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Dallas, Texas

February 2, 2016

108

Report of Independent Registered Public Accounting Firm

The Board of Directors and Shareholders

Southwest Airlines Co.

We have audited Southwest Airlines Co.’s internal control over financial reporting as of December 31, 2015, 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). Southwest Airlines Co.’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 conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). 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.

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.

In our opinion, Southwest Airlines Co. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Southwest Airlines Co. as of December 31, 2015 and 2014, and the related consolidated statements of income, comprehensive income, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2015 and our report dated February 2, 2016 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Dallas, Texas

February 2, 2016

109

QUARTERLY FINANCIAL DATA

(unaudited)

	Three months ended
(in millions except per share amounts)	March 31		June 30		Sept. 30		Dec. 31
2015
Operating revenues (a)(b)	$	4,414	$	5,111	$	5,318	$	4,977
Operating income	780		1,085		1,225		1,026
Income before income taxes	723		977		933		847
Net income	453		608		584		536
Net income per share, basic (a)(b)	0.67		0.91		0.89		0.83
Net income per share, diluted (a)(b)	0.66		0.90		0.88		0.82
	March 31		June 30		Sept. 30		Dec. 31
2014
Operating revenues (a)	$	4,166	$	5,011	$	4,800	$	4,628
Operating income	215		775		614		621
Income before income taxes	244		746		525		302
Net income	152		465		329		190
Net income per share, basic (a)	0.22		0.67		0.48		0.28
Net income per share, diluted (a)	0.22		0.67		0.48		0.28

(a) Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $43 million, $41 million, and $30 million, and increased both Basic and Diluted net income per share by approximately $.03, $.03, and $.02 for first, second, and third quarters of 2015, respectively. Also, as a result, fourth quarter 2014 Passenger revenues increased by approximately $55 million and both Basic and Diluted net income per share for the period increased by $.04. See Note 1 for further detail.

(b) Includes the impact of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The impact of this change during third quarter and fourth quarter 2015 resulted in increases to Operating revenue of approximately $303 million and $124 million, and increased both Basic and Diluted net income per share by approximately $.24 and $.10, respectively. See Note 1 for further detail.

110

Item 9.    Changes in and Disagreements With Accountants on Accounting and Financial Disclosure

None.

Item 9A.    Controls and Procedures

Evaluation of Disclosure Controls and Procedures. The Company maintains disclosure controls and procedures (as defined in Rule 13a-15(e) of the Securities Exchange Act (the “Exchange Act”)) designed to provide reasonable assurance that the information required to be disclosed by the 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. These include controls and procedures designed to ensure that this information is accumulated and communicated to the Company’s management, including its Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure. Management, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the Company’s disclosure controls and procedures as of December 31, 2015. Based on this evaluation, the Company’s Chief Executive Officer and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures were effective as of December 31, 2015, at the reasonable assurance level.

Management’s Annual Report on Internal Control over Financial Reporting. Management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Rule 13a-15(f) of the Exchange Act). The Company’s internal control over financial reporting is a process, under the supervision of the Company’s Chief Executive Officer and Chief Financial Officer, 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.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Therefore, even those systems determined to be effective can provide only reasonable assurance of achieving their control objectives.

Management, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the Company’s internal control over financial reporting as of December 31, 2015. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control - Integrated Framework (2013 Framework). Based on this evaluation, management, with the participation of the Company’s Chief Executive Officer and Chief Financial Officer, concluded that, as of December 31, 2015, the Company’s internal control over financial reporting was effective.

Ernst & Young, LLP, the independent registered public accounting firm who audited the Company’s Consolidated Financial Statements included in this Form 10-K, has issued a report on the Company’s internal control over financial reporting, which is included herein.

Changes in Internal Control over Financial Reporting. There were no changes in the Company’s internal control over financial reporting (as defined in Rule 13a-15(f) of the Exchange Act) during the quarter ended December 31, 2015, that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

111

Item 9B.    Other Information

None.

PART III

Item 10.        Directors, Executive Officers, and Corporate Governance

Directors and Executive Officers

The information required by this Item 10 regarding the Company’s directors will be set forth under the heading “Proposal 1 — Election of Directors” in the Proxy Statement for the Company’s 2016 Annual Meeting of Shareholders and is incorporated herein by reference. The information required by this Item 10 regarding the Company’s executive officers is set forth under the heading “Executive Officers of the Registrant” in Part I of this Form 10-K and is incorporated herein by reference.

Section 16(a) Compliance

The information required by this Item 10 regarding compliance with Section 16(a) of the Exchange Act will be set forth under the heading “Section 16(a) Beneficial Ownership Reporting Compliance” in the Proxy Statement for the Company’s 2016 Annual Meeting of Shareholders and is incorporated herein by reference.

Corporate Governance

Except as set forth in the following paragraph, the remaining information required by this Item 10 will be set forth under the heading “Corporate Governance” in the Proxy Statement for the Company’s 2016 Annual Meeting of Shareholders and is incorporated herein by reference.

The Company has adopted a Code of Ethics that applies to its principal executive officer, principal financial officer, and principal accounting officer or controller. The Company’s Code of Ethics, as well as its Corporate Governance Guidelines and the charters of its Audit, Compensation, and Nominating and Corporate Governance Committees, are available on the Company’s website, www.southwest.com. Copies of these documents are also available upon request to Investor Relations, Southwest Airlines Co., P.O. Box 36611, Dallas, TX 75235. The Company intends to disclose any amendments to, or waivers from, its Code of Ethics that apply to the Company’s principal executive officer, principal financial officer, and principal accounting officer or controller on the Company’s website, www.southwest.com, under the “About Southwest” caption, promptly following the date of any such amendment or waiver.

Item 11.        Executive Compensation

The information required by this Item 11 will be set forth under the headings “Compensation of Executive Officers” and “Compensation of Directors” in the Proxy Statement for the Company’s 2016 Annual Meeting of Shareholders and is incorporated herein by reference.

Item 12.        Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Except as set forth below regarding securities authorized for issuance under equity compensation plans, the information required by this Item 12 will be set forth under the heading “Voting Securities and Principal Shareholders” in the Proxy Statement for the Company’s 2016 Annual Meeting of Shareholders and is incorporated herein by reference.

Securities Authorized for Issuance under Equity Compensation Plans

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The following table provides information as of December 31, 2015, regarding compensation plans (including individual compensation arrangements) under which equity securities of the Company are authorized for issuance.

Equity Compensation Plan Information

Plan Category	Number of Securities to be Issued Upon Exercise of Outstanding Options, Warrants, and Rights (a)			Weighted-Average Exercise Price of Outstanding Options, Warrants, and Rights (b)				Number of Securities Remaining Available for Future Issuance  Under Equity Compensation Plans (Excluding Securities Reflected in Column (a)) (c)
Equity Compensation Plans Approved by Security Holders	2,294,804	(1	)	$	13.44	(2	)	32,761,701	(3	)
Equity Compensation Plans not Approved by Security Holders	12,548			$	13.25			—
Total	2,307,352			$	13.44	(2	)	32,761,701

(1) Includes 809,727 shares of common stock issuable upon exercise of outstanding stock options and 1,485,077 restricted share units settleable in shares of the Company’s common stock.

(2) The weighted-average exercise price does not take into account the restricted share units discussed in footnote (1) above because the restricted share units do not have an exercise price upon vesting.

(3) Of these shares, (i) 9,995,360 shares remained available for issuance under the Company’s tax-qualified employee stock purchase plan; and (ii) 22,765,741 shares remained available for issuance under the Company’s 2007 Equity Incentive Plan in connection with the exercise of stock options and stock appreciation rights, the settlement of awards of restricted stock, restricted stock units, and phantom shares, and the grant of unrestricted shares of common stock; however, no more than 1,265,178 shares remain available for grant in connection with awards of unrestricted shares of common stock, stock-settled phantom shares, and awards to non-Employee members of the Board. These shares are in addition to the shares reserved for issuance pursuant to outstanding awards included in column (a).

See Note 9 to the Consolidated Financial Statements for information regarding the material features of the above plans. Each of the above plans provides that the number of shares with respect to which options may be granted, the number of shares of common stock subject to an outstanding option, and the number of restricted share units granted shall be proportionately adjusted in the event of a subdivision or consolidation of shares or the payment of a stock dividend on common stock, and the purchase price per share of outstanding options shall be proportionately revised.

Item 13.        Certain Relationships and Related Transactions, and Director Independence

The information required by this Item 13 will be set forth under the heading “Certain Relationships and Related Transactions, and Director Independence” in the Proxy Statement for the Company’s 2016 Annual Meeting of Shareholders and is incorporated herein by reference.

Item 14.        Principal Accounting Fees and Services

The information required by this Item 14 will be set forth under the heading “Relationship with Independent Auditors” in the Proxy Statement for the Company’s 2016 Annual Meeting of Shareholders and is incorporated herein by reference.

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PART IV

Item 15.        Exhibits and Financial Statement Schedules

(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 Consolidated Financial Statements, including the notes thereto, or the circumstances requiring inclusion of such schedules are not present.

3. Exhibits:

3.1	Restated Certificate of Formation of the Company, effective May 18, 2012 (incorporated by reference to Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012 (File No. 1-7259)).
3.2	Amended and Restated Bylaws of the Company, effective November 19, 2009 (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed November 20, 2009 (File No. 1-7259)).
4.1	Specimen certificate representing common stock of the Company (incorporated by reference to Exhibit 4.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1994 (File No. 1-7259)).
4.2	Indenture dated as of February 14, 2005, between the Company and The Bank of New York Trust Company, N.A., Trustee (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed February 14, 2005 (File No. 1-7259)).
4.3	Indenture dated as of September 17, 2004, between the Company and Wells Fargo Bank, N.A., Trustee (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-3 filed October 30, 2002 (File No. 333-100861)).
4.4	Indenture dated as of February 25, 1997, between the Company and U.S. Trust Company of Texas, N.A. (incorporated by reference to Exhibit 4.12 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1996 (File No. 1-7259)).
	The Company is not filing any other instruments evidencing any indebtedness because the total amount of securities authorized under any single such instrument does not exceed 10 percent of its total consolidated assets. Copies of such instruments will be furnished to the Securities and Exchange Commission upon request.
10.1	Purchase Agreement No. 1810, dated January 19, 1994, between The Boeing Company and the Company (incorporated by reference to Exhibit 10.4 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1993 (File No. 1-7259)); Supplemental Agreement No. 1 (incorporated by reference to Exhibit 10.3 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1996 (File No. 1-7259)); Supplemental Agreements Nos. 2, 3, and 4 (incorporated by reference to Exhibit 10.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1997 (File No. 1-7259)); Supplemental Agreements Nos. 5, 6, and 7 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1998 (File No. 1-7259)); Supplemental Agreements Nos. 8, 9, and 10 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended

114

December 31, 1999 (File No. 1-7259)); Supplemental Agreements Nos. 11, 12, 13, and 14 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2000 (File No. 1-7259)); Supplemental Agreements Nos. 15, 16, 17, 18, and 19 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2001 (File No. 1-7259)); Supplemental Agreements Nos. 20, 21, 22, 23, and 24 (incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2002 (File No. 1-7259)); Supplemental Agreements Nos. 25, 26, 27, 28, and 29 (incorporated by reference to Exhibit 10.8 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2003 (File No. 1-7259)); Supplemental Agreements Nos. 30, 31, 32, and 33 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 (File No. 1-7259)); Supplemental Agreements Nos. 34, 35, 36, 37, and 38 (incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2004 (File No. 1-7259)); Supplemental Agreements Nos. 39 and 40 (incorporated by reference to Exhibit 10.6 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2004 (File No. 1-7259)); Supplemental Agreement No. 41 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2004 (File No. 1-7259)); Supplemental Agreements Nos. 42, 43, and 44 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2005 (File No. 1-7259)); Supplemental Agreement No. 45 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2005 (File No. 1-7259)); Supplemental Agreements Nos. 46 and 47 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2006 (File No. 1-7259)); Supplemental Agreement No. 48 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2006 (File No. 1-7259)); Supplemental Agreements Nos. 49 and 50 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2006 (File No. 1-7259)); Supplemental Agreement No. 51 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2006 (File No. 1-7259)); Supplemental Agreement No. 52 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2007 (File No. 1-7259)); Supplemental Agreement No. 53 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007 (File No. 1-7259)); Supplemental Agreements Nos. 54 and 55 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2007 (File No. 1-7259)); Supplemental Agreement No. 56 (incorporated by reference to Exhibit 10.1 to Southwest’s Annual Report on Form 10-K for the year ended December 31, 2007 (File No. 1-7259)); Supplemental Agreements Nos. 57, 58, and 59 (incorporated by reference to Exhibits 10.1, 10.2, and 10.3, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2008 (File No. 1-7259)); Supplemental Agreement No. 60 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2008 (File No. 1-7259)); Supplemental Agreement No. 61 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2008 (File No. 1-7259)); Supplemental Agreements Nos. 62 and 63 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2009 (File No. 1-7259)); Supplemental Agreement No. 64 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2010 (File No. 1-7259)); Supplemental Agreement No. 65 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2010 (File No. 1-7259)); Supplemental Agreement No. 66 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 (File No. 1-7259)); Supplemental Agreement No. 67 (incorporated by reference to Exhibit 10.1(a) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-7259)); Supplemental Agreement No. 68 (incorporated by reference to Exhibit 10.1(b) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-7259)); Supplemental Agreement No. 69 (incorporated by reference to Exhibit 10.1(c) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010

115

	(File No. 1-7259)); Supplemental Agreement No. 70 (incorporated by reference to Exhibit 10.1(d) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-7259)); Supplemental Agreements Nos. 71 and 72 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2011 (File No. 1-7259)); Supplemental Agreement No. 73 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2011 (File No. 1-7259)); Supplemental Agreement No. 74 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011 (File No. 1-7259)); Supplemental Agreement No. 75 (incorporated by reference to Exhibit 10.1(a) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 (File No. 1-7259)); Supplemental Agreements Nos. 76 and 77 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012 (File No. 1-7259)); Supplemental Agreements Nos. 78 and 79 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2012 (File No. 1-7259)); Supplemental Agreements Nos. 80 and 81 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2013 (File No. 1-7259)); Supplemental Agreements Nos. 82 and 83 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013 (File No. 1-7259)); Supplemental Agreement No. 84 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2013 (File No. 1-7259)); Supplemental Agreement No. 85 (incorporated by reference to Exhibit 10.1(a) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 (File No. 1-7259)); Supplemental Agreement No. 86 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2014 (File No. 1-7259)); Supplemental Agreement No. 87 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 (File No. 1-7259)); Supplemental Agreement No. 88 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 (File No. 1-7259)); Supplemental Agreements Nos. 89 and 90 (incorporated by reference to Exhibits 10.1(a) and 10.1(b), respectively, to the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 (File No. 1-7259)); Supplemental Agreement No. 91 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (File No. 1-7259)); Supplemental Letter Agreement No. 1810-LA-1501773 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2015 (File No. 1-7259)). (1)
10.1(a)	Supplemental Agreement No. 92 to Purchase Agreement No. 1810, dated January 19, 1994, between The Boeing Company and the Company. (1)
10.2	Form of Amended and Restated Executive Service Recognition Plan Executive Employment Agreement between the Company and certain Officers of the Company (incorporated by reference to Exhibit 10.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 1-7259)). (2)
10.3	Southwest Airlines Co. 1996 Incentive Stock Option Plan (incorporated by reference to Exhibit 10.12 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 (File No. 1-7259)). (2)
10.4	Letter Agreement between Southwest Airlines Co. and Gary C. Kelly, effective as of February 1, 2011 (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed February 1, 2011 (File No. 1-7259)). (2)
10.5	Southwest Airlines Co. Amended and Restated Severance Plan for Directors (as amended and restated effective May 19, 2009) (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2009 (File No. 1-7259)).
10.6	Southwest Airlines Co. Outside Director Incentive Plan (as amended and restated effective May 16, 2007) (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007 (File No. 1-7259)).
10.7	Southwest Airlines Co. 2002 Bonus SWAPA Non-Qualified Stock Option Plan (incorporated by reference to Exhibit 4.2 to the Company’s Registration Statement on Form S-8 filed August 27, 2002 (File No. 333-98761)).

116

10.8	Southwest Airlines Co. 2002 SWAPIA Non-Qualified Stock Option Plan (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-8 filed October 30, 2002 (File No. 333-100862)).
10.9	Southwest Airlines Co. Amended and Restated 2007 Equity Incentive Plan (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed May 18, 2015 (File No. 1-7259)). (2)
10.10	Southwest Airlines Co. 2007 Equity Incentive Plan Form of Notice of Grant and Terms and Conditions for Stock Option Grant (incorporated by reference to Exhibit 10.31 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2007 (File No. 1-7259)). (2)
10.11	Southwest Airlines Co. Excess Benefit Plan (incorporated by reference to Exhibit 10.32 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 1-7259)). (2)
10.12	Amendment No. 1 to the Southwest Airlines Co. Excess Benefit Plan (incorporated by reference to Exhibit 10.33 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 1-7259)). (2)
10.13	Amendment No. 2 to the Southwest Airlines Co. Excess Benefit Plan (incorporated by reference to Exhibit 10.34 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 1-7259)). (2)
10.14	Amended and Restated Southwest Airlines Co. 2005 Excess Benefit Plan (as amended and restated effective for plan years beginning on and after January 1, 2015) (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 (File No. 1-7259)). (2)
10.15	Form of Indemnification Agreement between the Company and its Directors (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed January 22, 2009 (File No. 1-7259)).
10.16	Southwest Airlines Co. Amended and Restated 2007 Equity Incentive Plan Form of Notice of Grant and Terms and Conditions for Restricted Stock Unit grants (incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 (File No. 1-7259)). (2)
10.17	$1,000,000,000 Revolving Credit Facility Agreement among the Company, The Banks Party thereto, Morgan Stanley Senior Funding, Inc., as Syndication Agent, Bank of America, N.A., Barclays Bank PLC, Deutsche Bank Securities Inc., Goldman Sachs Bank USA, and Wells Fargo Bank, N.A., as Documentation Agents, Citibank, N.A. and JPMorgan Chase Bank, N.A., as Co-Administrative Agents, and Citibank, N.A., as Paying Agent, dated as of April 2, 2013 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed April 4, 2013 (File No. 1-7259)).
10.18	Purchase Agreement No. 3729 and Aircraft General Terms Agreement, dated December 13, 2011, between The Boeing Company and the Company (incorporated by reference to Exhibit 10.28 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 (File No. 1-7259)); Supplemental Agreements Nos. 1 and 2 (incorporated by reference to Exhibits 10.3 and 10.4, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013 (File No. 1-7259)); Supplemental Agreement No. 3 (incorporated by reference to Exhibit 10.27(a) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 (File No. 1-7259)). (1)
10.18(a)	Supplemental Agreement No. 4 to Purchase Agreement No. 3729, dated December 13, 2011, between The Boeing Company and the Company. (1)
10.19	Southwest Airlines Co. Senior Executive Short Term Incentive Plan (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed January 30, 2013 (File No. 1-7259)). (2)
10.20	Southwest Airlines Co. Deferred Compensation Plan for Senior Leadership and Non-Employee Members of the Southwest Airlines Co. Board of Directors (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed May 19, 2014 (File No. 1-7259)). (2)
10.21	Southwest Airlines Co. Amended and Restated 2007 Equity Incentive Plan Form of Notice of Grant and Terms and Conditions for Performance-Based Restricted Stock Unit grants (incorporated by reference to Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 (File No. 1-7259)). (2)

117

21	Subsidiaries of the Company.
23	Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm.
31.1	Rule 13a-14(a) Certification of Chief Executive Officer.
31.2	Rule 13a-14(a) Certification of Chief Financial Officer.
32	Section 1350 Certification of Chief Executive Officer and Chief Financial Officer. (3)
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Extension Labels Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

(1) Pursuant to 17 CFR 240.24b-2, confidential information has been omitted and has been filed separately with the Securities and Exchange Commission pursuant to a Confidential Treatment Application filed with the Commission.

(2) Management contract or compensatory plan or arrangement.

(3) This exhibit is being furnished rather than filed and shall not be deemed incorporated by reference into any filing, in accordance with Item 601 of Regulation S-K.

A copy of each exhibit may be obtained at a price of 15 cents per page, $10.00 minimum order, by writing to: Investor Relations, Southwest Airlines Co., P.O. Box 36611, Dallas, Texas 75235-1611.

118

SIGNATURES 

Pursuant to the requirements 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.

	SOUTHWEST AIRLINES CO.
February 2, 2016	By	/s/   Tammy Romo
		Tammy Romo
		Executive Vice President & Chief Financial Officer
		(On behalf of the Registrant and in
		her capacity as Principal Financial
		& Accounting Officer)

119

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on February 2, 2016, on behalf of the registrant and in the capacities indicated.

Signature	Title
/s/    GARY C. KELLY	Chairman of the Board, President, & Chief Executive Officer (Principal Executive Officer)
Gary C. Kelly
/s/    TAMMY ROMO	Executive Vice President & Chief Financial Officer (Principal Financial & Accounting Officer)
Tammy Romo
/s/    RON RICKS	Vice Chairman of the Board
Ron Ricks
/s/    DAVID W. BIEGLER	Director
David W. Biegler
/s/    J. VERONICA BIGGINS	Director
J. Veronica Biggins
/s/    DOUGLAS H. BROOKS	Director
Douglas H. Brooks
/s/    WILLIAM H. CUNNINGHAM	Director
William H. Cunningham
/s/    JOHN G. DENISON	Director
John G. Denison
/s/    THOMAS W. GILLIGAN	Director
Thomas W. Gilligan
/s/    NANCY B. LOEFFLER	Director
Nancy B. Loeffler
/s/    JOHN T. MONTFORD	Director
John T. Montford

120

INDEX TO THE EXHIBITS

3.1	Restated Certificate of Formation of the Company, effective May 18, 2012 (incorporated by reference to Exhibit 3.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012 (File No. 1-7259)).
3.2	Amended and Restated Bylaws of the Company, effective November 19, 2009 (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed November 20, 2009 (File No. 1-7259)).
4.1	Specimen certificate representing common stock of the Company (incorporated by reference to Exhibit 4.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1994 (File No. 1-7259)).
4.2	Indenture dated as of February 14, 2005, between the Company and The Bank of New York Trust Company, N.A., Trustee (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed February 14, 2005 (File No. 1-7259)).
4.3	Indenture dated as of September 17, 2004, between the Company and Wells Fargo Bank, N.A., Trustee (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-3 filed October 30, 2002 (File No. 333-100861)).
4.4	Indenture dated as of February 25, 1997, between the Company and U.S. Trust Company of Texas, N.A. (incorporated by reference to Exhibit 4.12 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1996 (File No. 1-7259)).
	The Company is not filing any other instruments evidencing any indebtedness because the total amount of securities authorized under any single such instrument does not exceed 10 percent of its total consolidated assets. Copies of such instruments will be furnished to the Securities and Exchange Commission upon request.
10.1	Purchase Agreement No. 1810, dated January 19, 1994, between The Boeing Company and the Company (incorporated by reference to Exhibit 10.4 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1993 (File No. 1-7259)); Supplemental Agreement No. 1 (incorporated by reference to Exhibit 10.3 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1996 (File No. 1-7259)); Supplemental Agreements Nos. 2, 3, and 4 (incorporated by reference to Exhibit 10.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1997 (File No. 1-7259)); Supplemental Agreements Nos. 5, 6, and 7 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1998 (File No. 1-7259)); Supplemental Agreements Nos. 8, 9, and 10 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1999 (File No. 1-7259)); Supplemental Agreements Nos. 11, 12, 13, and 14 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2000 (File No. 1-7259)); Supplemental Agreements Nos. 15, 16, 17, 18, and 19 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2001 (File No. 1-7259)); Supplemental Agreements Nos. 20, 21, 22, 23, and 24 (incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2002 (File No. 1-7259)); Supplemental Agreements Nos. 25, 26, 27, 28, and 29 (incorporated by reference to Exhibit 10.8 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2003 (File No. 1-7259)); Supplemental Agreements Nos. 30, 31, 32, and 33 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 (File No. 1-7259)); Supplemental Agreements Nos. 34, 35, 36, 37, and 38 (incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2004 (File No. 1-7259)); Supplemental Agreements Nos. 39 and 40 (incorporated by reference to Exhibit 10.6 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2004 (File No. 1-7259)); Supplemental Agreement No. 41 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2004 (File No. 1-7259)); Supplemental Agreements

121

Nos. 42, 43, and 44 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2005 (File No. 1-7259)); Supplemental Agreement No. 45 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2005 (File No. 1-7259)); Supplemental Agreements Nos. 46 and 47 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2006 (File No. 1-7259)); Supplemental Agreement No. 48 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2006 (File No. 1-7259)); Supplemental Agreements Nos. 49 and 50 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2006 (File No. 1-7259)); Supplemental Agreement No. 51 (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2006 (File No. 1-7259)); Supplemental Agreement No. 52 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2007 (File No. 1-7259)); Supplemental Agreement No. 53 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007 (File No. 1-7259)); Supplemental Agreements Nos. 54 and 55 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2007 (File No. 1-7259)); Supplemental Agreement No. 56 (incorporated by reference to Exhibit 10.1 to Southwest’s Annual Report on Form 10-K for the year ended December 31, 2007 (File No. 1-7259)); Supplemental Agreements Nos. 57, 58, and 59 (incorporated by reference to Exhibits 10.1, 10.2, and 10.3, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2008 (File No. 1-7259)); Supplemental Agreement No. 60 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2008 (File No. 1-7259)); Supplemental Agreement No. 61 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2008 (File No. 1-7259)); Supplemental Agreements Nos. 62 and 63 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2009 (File No. 1-7259)); Supplemental Agreement No. 64 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2010 (File No. 1-7259)); Supplemental Agreement No. 65 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2010 (File No. 1-7259)); Supplemental Agreement No. 66 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 (File No. 1-7259)); Supplemental Agreement No. 67 (incorporated by reference to Exhibit 10.1(a) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-7259)); Supplemental Agreement No. 68 (incorporated by reference to Exhibit 10.1(b) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-7259)); Supplemental Agreement No. 69 (incorporated by reference to Exhibit 10.1(c) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-7259)); Supplemental Agreement No. 70 (incorporated by reference to Exhibit 10.1(d) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 (File No. 1-7259)); Supplemental Agreements Nos. 71 and 72 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2011 (File No. 1-7259)); Supplemental Agreement No. 73 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2011 (File No. 1-7259)); Supplemental Agreement No. 74 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011 (File No. 1-7259)); Supplemental Agreement No. 75 (incorporated by reference to Exhibit 10.1(a) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 (File No. 1-7259)); Supplemental Agreements Nos. 76 and 77 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2012 (File No. 1-7259)); Supplemental Agreements Nos. 78 and 79 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2012 (File No. 1-7259)); Supplemental Agreements Nos. 80 and 81 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2013

122

	(File No. 1-7259)); Supplemental Agreements Nos. 82 and 83 (incorporated by reference to Exhibits 10.1 and 10.2, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013 (File No. 1-7259)); Supplemental Agreement No. 84 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2013 (File No. 1-7259)); Supplemental Agreement No. 85 (incorporated by reference to Exhibit 10.1(a) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 (File No. 1-7259)); Supplemental Agreement No. 86 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2014 (File No. 1-7259)); Supplemental Agreement No. 87 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 (File No. 1-7259)); Supplemental Agreement No. 88 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 (File No. 1-7259)); Supplemental Agreements Nos. 89 and 90 (incorporated by reference to Exhibits 10.1(a) and 10.1(b), respectively, to the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 (File No. 1-7259)); Supplemental Agreement No. 91 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (File No. 1-7259)); Supplemental Letter Agreement No. 1810-LA-1501773 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2015 (File No. 1-7259)). (1)
10.1(a)	Supplemental Agreement No. 92 to Purchase Agreement No. 1810, dated January 19, 1994, between The Boeing Company and the Company. (1)
10.2	Form of Amended and Restated Executive Service Recognition Plan Executive Employment Agreement between the Company and certain Officers of the Company (incorporated by reference to Exhibit 10.2 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 1-7259)). (2)
10.3	Southwest Airlines Co. 1996 Incentive Stock Option Plan (incorporated by reference to Exhibit 10.12 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 (File No. 1-7259)). (2)
10.4	Letter Agreement between Southwest Airlines Co. and Gary C. Kelly, effective as of February 1, 2011 (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed February 1, 2011 (File No. 1-7259)). (2)
10.5	Southwest Airlines Co. Amended and Restated Severance Plan for Directors (as amended and restated effective May 19, 2009) (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2009 (File No. 1-7259)).
10.6	Southwest Airlines Co. Outside Director Incentive Plan (as amended and restated effective May 16, 2007) (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2007 (File No. 1-7259)).
10.7	Southwest Airlines Co. 2002 Bonus SWAPA Non-Qualified Stock Option Plan (incorporated by reference to Exhibit 4.2 to the Company’s Registration Statement on Form S-8 filed August 27, 2002 (File No. 333-98761)).
10.8	Southwest Airlines Co. 2002 SWAPIA Non-Qualified Stock Option Plan (incorporated by reference to Exhibit 4.1 to the Company’s Registration Statement on Form S-8 filed October 30, 2002 (File No. 333-100862)).

123

10.9	Southwest Airlines Co. Amended and Restated 2007 Equity Incentive Plan (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed May 18, 2015 (File No. 1-7259)). (2)
10.10	Southwest Airlines Co. 2007 Equity Incentive Plan Form of Notice of Grant and Terms and Conditions for Stock Option Grant (incorporated by reference to Exhibit 10.31 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2007 (File No. 1-7259)). (2)
10.11	Southwest Airlines Co. Excess Benefit Plan (incorporated by reference to Exhibit 10.32 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 1-7259)). (2)
10.12	Amendment No. 1 to the Southwest Airlines Co. Excess Benefit Plan (incorporated by reference to Exhibit 10.33 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 1-7259)). (2)
10.13	Amendment No. 2 to the Southwest Airlines Co. Excess Benefit Plan (incorporated by reference to Exhibit 10.34 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2008 (File No. 1-7259)). (2)
10.14	Amended and Restated Southwest Airlines Co. 2005 Excess Benefit Plan (as amended and restated effective for plan years beginning on and after January 1, 2015) (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2014 (File No. 1-7259)). (2)
10.15	Form of Indemnification Agreement between the Company and its Directors (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed January 22, 2009 (File No. 1-7259)).
10.16	Southwest Airlines Co. Amended and Restated 2007 Equity Incentive Plan Form of Notice of Grant and Terms and Conditions for Restricted Stock Unit grants (incorporated by reference to Exhibit 10.3 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 (File No. 1-7259)). (2)
10.17	$1,000,000,000 Revolving Credit Facility Agreement among the Company, The Banks Party thereto, Morgan Stanley Senior Funding, Inc., as Syndication Agent, Bank of America, N.A., Barclays Bank PLC, Deutsche Bank Securities Inc., Goldman Sachs Bank USA, and Wells Fargo Bank, N.A., as Documentation Agents, Citibank, N.A. and JPMorgan Chase Bank, N.A., as Co-Administrative Agents, and Citibank, N.A., as Paying Agent, dated as of April 2, 2013 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed April 4, 2013 (File No. 1-7259)).
10.18	Purchase Agreement No. 3729 and Aircraft General Terms Agreement, dated December 13, 2011, between The Boeing Company and the Company (incorporated by reference to Exhibit 10.28 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2011 (File No. 1-7259)); Supplemental Agreements Nos. 1 and 2 (incorporated by reference to Exhibits 10.3 and 10.4, respectively, to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013 (File No. 1-7259)); Supplemental Agreement No. 3 (incorporated by reference to Exhibit 10.27(a) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2013 (File No. 1-7259)). (1)
10.18(a)	Supplemental Agreement No. 4 to Purchase Agreement No. 3729, dated December 13, 2011, between The Boeing Company and the Company. (1)
10.19	Southwest Airlines Co. Senior Executive Short Term Incentive Plan (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed January 30, 2013 (File No. 1-7259)). (2)
10.20	Southwest Airlines Co. Deferred Compensation Plan for Senior Leadership and Non-Employee Members of the Southwest Airlines Co. Board of Directors (incorporated by reference to Exhibit 99.1 to the Company’s Current Report on Form 8-K filed May 19, 2014 (File No. 1-7259)). (2)

124

10.21	Southwest Airlines Co. Amended and Restated 2007 Equity Incentive Plan Form of Notice of Grant and Terms and Conditions for Performance-Based Restricted Stock Unit grants (incorporated by reference to Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014 (File No. 1-7259)). (2)
21	Subsidiaries of the Company.
23	Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm.
31.1	Rule 13a-14(a) Certification of Chief Executive Officer.
31.2	Rule 13a-14(a) Certification of Chief Financial Officer.
32	Section 1350 Certification of Chief Executive Officer and Chief Financial Officer. (3)
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Extension Labels Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

(1) Pursuant to 17 CFR 240.24b-2, confidential information has been omitted and has been filed separately with the Securities and Exchange Commission pursuant to a Confidential Treatment Application filed with the Commission.

(2) Management contract or compensatory plan or arrangement.

(3) This exhibit is being furnished rather than filed and shall not be deemed incorporated by reference into any filing, in accordance with Item 601 of Regulation S-K.

A copy of each exhibit may be obtained at a price of 15 cents per page, $10.00 minimum order, by writing to: Investor Relations, Southwest Airlines Co., P.O. Box 36611, Dallas, Texas 75235-1611.

125

EX-10.1 (A)

Supplemental Agreement No. 92

to

Purchase Agreement No. 1810

between

THE BOEING COMPANY

and

SOUTHWEST AIRLINES CO.

Relating to Boeing Model 737-7H4 and 737-8H4 Aircraft

THIS SUPPLEMENTAL AGREEMENT No. 92 (SA-92) is entered into as of December 21, 2015, by and between THE BOEING COMPANY, a Delaware corporation with principal offices in Seattle, Washington, (Boeing) and SOUTHWEST AIRLINES CO., a Texas corporation with principal offices in Dallas, Texas (Buyer).

RECITALS:

WHEREAS, Buyer and Boeing entered into Purchase Agreement No. 1810 dated January 19, 1994, as amended and supplemented (Purchase Agreement), relating to the purchase and sale of Boeing Model 737-7H4 aircraft (737-7H4 Aircraft) and 737-8H4 aircraft (737-8H4 Aircraft), collectively the “Aircraft”. This SA-92 is an amendment to and is incorporated into the Purchase Agreement. Capitalized terms used herein but not otherwise defined shall have the meaning set forth in the Purchase Agreement. The 737-7H4 Aircraft are also defined as “Block 700LUV Aircraft” and the 737-8H4 Aircraft as “Block 800LUV Aircraft”.

WHEREAS, Buyer has elected to substitute the purchase of twenty-five (25) Block 800LUV Aircraft in place of twenty-five (25) Block 700LUVAircraft currently listed on Table 1a to the Purchase Agreement, in accordance with the terms set forth in Letter Agreement SWA-PA-1810-LA-1105883, Aircraft Model Substitution.

WHEREAS, Boeing and Buyer desire to accelerate the scheduled delivery months for (5) Block 700LUV Aircraft substituted to Block 800LUV Aircraft in this SA-92 as follows: three (3) deliveries in May 2017 and two (2) deliveries in June 2017 accelerate to two (2) in November 2016 and three (3) in December 2016, respectively.

WHEREAS, Buyer has elected to exercise its right to purchase twelve (12) Option Aircraft with scheduled delivery months in 2017 as Block 800LUV Aircraft (Exercised Option Aircraft) in accordance with the terms set forth in Letter Agreement SWA-PA-1810-LA-1105884R1, Option Aircraft and Letter Agreement SWA-PA-1810-LA-1105883, Aircraft Model Substitution.

WHEREAS, Boeing and Buyer have previously agreed to cancel twelve (12) Option Aircraft with scheduled delivery months in 2016 (Canceled Options) pursuant to

***Pursuant to 17 CFR 240.24b-2, confidential information has been omitted and has been filed separately with the Securities and Exchange Commission pursuant to a Confidential Treatment Application filed with the Commission.

P.A. No. 1810	SA-92-1
	BOEING PROPRIETARY

Letter Agreement SWA-PA-1810-LA-1501773, Cancelation of Option Aircraft, executed on July 6, 2015 and the parties desire to make certain administrative updates to the Purchase Agreement to reflect such cancellation.

WHEREAS, Boeing and Buyer have agreed to add twenty-one (21) incremental Block 800LUV Aircraft to the Purchase Agreement (SA-92 Incremental Aircraft), with thirteen (13) scheduled to deliver in 2017 and eight (8) scheduled to deliver in 2018.

WHEREAS, Boeing and Buyer desire to designate the remaining twelve (12) Option Aircraft scheduled to deliver in 2018, as described in Letter Agreement SWA-PA-1810-LA-1105884R1, Option Aircraft, to be Model 737-8H4 Aircraft rather than Model 737-7H4 Aircraft.

WHEREAS, Boeing and Buyer desire to add six (6) new Option Aircraft scheduled to deliver in 2018 as model 737-87H Aircraft (SA-92 Option Aircraft), resulting in a total of eighteen (18) Option Aircraft with scheduled delivery months in 2018.

WHEREAS, the parties desire to amend the Purchase Agreement as hereinafter set forth to make certain other changes;

NOW THEREFORE, in consideration of the mutual covenants herein contained, the parties agree to amend the Purchase Agreement as follows:

1.    TABLE OF CONTENTS.

The Table of Contents is deleted in its entirety and a new Table of Contents (attached), which lists Tables, Exhibits and Letter Agreements revised by this Supplemental Agreement No. 92 and identified by “SA-92”. Such revised Table of Contents, by this reference, is incorporated in the Purchase Agreement.

2.    BASIC ARTICLES.

Article 1, Subject Matter of Sale, and Article 3, Price of Aircraft, are deleted in their entity and replaced by new Article 1 and Article 3 (attached) and incorporated into the Purchase Agreement by this reference. Such new Articles 1 and 3 reflect the incorporation of the new Table 1d, added to the Purchase Agreement in this SA-92.

3.    TABLES.

3.1    Table 1a, Aircraft Delivery, Description, Price and Advance Payments - Block 700LUV Aircraft, is deleted in its entirety as the twenty-five (25) Block 700LUV Aircraft previously listed on Table 1a are substituted to Block 800LUV Aircraft in this SA-92 and will now be listed on Table 1c to the Purchase Agreement. All references to Table 1a are hereby removed from the Purchase Agreement.

3.2    Table 1c, Aircraft Information Table - Block 800LUV Aircraft (non-ETOPS Configuration), is deleted in its entirety and replaced by a new Table 1c (attached). The new Table 1c (i) adds the twenty-five (25) Block 700LUV Aircraft substituted to Block 800LUV Aircraft in this SA-92 and (ii) accelerates the scheduled delivery month for

P.A. No. 1810	SA-92-2
	BOEING PROPRIETARY

three (3) deliveries from May 2017 and two (2) deliveries from June 2017 to two (2) in November 2016 and three (3) in December 2016, respectively.

3.3A new Table 1d, Aircraft Information Table - Block 800LUV Aircraft (non-ETOPS Configuration), is hereby added to the Purchase Agreement and lists the Exercised Option Aircraft and SA-92 Incremental Aircraft, collectively referred to hereinafter as “Table 1d Aircraft” as the context dictates.

4.EXHIBITS.

4.1Exhibit A-5 737-7H4 Aircraft Configuration is deleted in its entirety.

4.2Attachment B, Buyer Furnished Equipment Variables, to Exhibit E of the Purchase Agreement is deleted in its entirety and a replaced by a new Attachment B (attached) which adds the BFE on dock dates for the Table 1d Aircraft.

5.LETTER AGREEMENTS.

5.1Letter Agreement SWA-PA-1810-LA-1001315R3, ***, is deleted in its entirety and replaced by a new Letter Agreement SWA-PA-1810-LA-1001315R4, including a revised Attachment A (attached). The new Letter Agreement reflects the (i) substitution of Aircraft 41-62 to Block 800LUV Aircraft, (ii) correction of one (1) delivery month and (iii) ***.

5.2Letter Agreement SWA-PA-1810-LA-1003490R3, ***, is deleted in its entirety and replaced by a new Letter Agreement SWA-PA-1810-LA-1003490R4 (attached), which adds the applicability of the Table 1d Aircraft to the terms of this Letter Agreement.

5.3Letter Agreement SWA-PA-1810-LA-1105884R1, Option Aircraft, is deleted in its entirety and replaced by a new Letter Agreement SWA-PA-1810-LA-1105884R2, including revised Attachments (attached). The new Letter Agreement reflects the (i) removal of the Canceled Options (ii) removal of the Exercised Option Aircraft (iii) substitution of 737-8H4 Aircraft as “Option Aircraft” in lieu of 737-7H4 Aircraft and (iv) addition of the SA-92 Option Aircraft.

5.4Letter Agreement SWA-PA-1810-LA-1105886R1, ***, is deleted in its entirety and replaced by a new Letter Agreement SWA-PA-1810-LA-1105886R2 (attached), which adds the applicability of the Table 1d Aircraft to the terms of this Letter Agreement and deletes references to Table 1a and Block 700LUV Aircraft.

5.5Letter Agreement SWA-PA-1810-LA-1105888R4, ***, is deleted in its entirety and replaced by a new Letter Agreement SWA-PA-1810-LA-1105888R5 (attached), which (i) adds the applicability of the Table 1d Aircraft to certain terms of this Letter Agreement (ii) deletes references to Table 1a and Block 700LUV Aircraft and (iii) makes administrative updates to defined terms due to changes to the Purchase Agreement

set forth in this SA-92.

P.A. No. 1810	SA-92-3
	BOEING PROPRIETARY

5.6Letter Agreement SWA-PA-1810-LA-1303010, ***, is deleted in its entirety and replaced by a new Letter Agreement SWA-PA-1810-LA-1303010R1 (attached), which makes administrative changes including removing references to Block 700LUV Aircraft, ***.

5.7A new Letter Agreement SWA-PA-1810-LA-1504814, ***, is hereby added to the Purchase Agreement ***.

5.8Letter Agreement SWA-PA-01810/03729-LA-1301169, ***, no longer applies, is deleted in its entirety and marked as inactive.

6.ADVANCE PAYMENT IMPACTS.

***

[Signature page follows.]

[Remainder of page intentionally left blank.]

P.A. No. 1810	SA-92-4
	BOEING PROPRIETARY

The Purchase Agreement will be deemed to be supplemented to the extent herein provided and as so supplemented will continue in full force and effect.

EXECUTED IN DUPLICATE as of the day and year first above written.

THE BOEING COMPANY	SOUTHWEST AIRLINES CO.
By: /s/ Jon W. Lewis	By:/s/ Michael Van de Ven
Its: Attorney-In-Fact	Its: EVP &COO

P.A. No. 1810	SA-92-5
	BOEING PROPRIETARY

TABLE OF CONTENTS
	Page	SA
	Number	Number

ARTICLES

1.	Subject Matter of Sale	1-1	SA-92
2.	Delivery, Title and Risk
	of Loss	2-1	SA-28
3.	Price of Aircraft	3‑1	SA-92
4.	Taxes	4-1
5.	Payment	5‑1
6.	Excusable Delay	6‑1
7.	Changes to the Detail
	Specification	7-1	SA-73
8.	Federal Aviation Requirements and
	Certificates and Export License	8-1
9.	Representatives, Inspection,
	Flights and Test Data	9-1
10.	Assignment, Resale or Lease	10‑1
11.	Termination for Certain Events	11‑1
12.	Product Assurance; Disclaimer and
	Release; Exclusion of Liabilities;
	Customer Support; Indemnification
	and Insurance	12-1
13.	Buyer Furnished Equipment and
	Spare Parts	13-1
14.	Contractual Notices and Requests	14‑1
15.	Miscellaneous	15‑1

P.A. No. 1810	i
K/SWA		SA-92

TABLE OF CONTENTS
	SA
	Number

TABLE

1b	Aircraft Information Table - Block 800LUV Aircraft	SA-82
1c	Aircraft Information Table - Block 800LUV Aircraft	SA-92
	(non-ETOPS Configuration)
1d	Aircraft Information Table - Block 800LUV Aircraft	SA-92
	(non-ETOPS Configuration)

EXHIBITS

A-6	Aircraft Configuration - Block 800LUV Aircraft	SA-75
A-7	Aircraft Configuration - Block 800LUV Aircraft	SA-84
	(non-ETOPS Configuration)
B	***	SA-75
C	Customer Support Document
C-2	737-800 Customer Support Document	SA-75
D-2	Economic Price Adjustment	SA-75
	ECI-MFG/CPI (July 2011 Base Price)
E	Buyer Furnished Equipment	SA-75
	Provisions Document
	Attachment A - 737-7H4 Aircraft (through 2012)
	Attachment B - 737-8H4 Aircraft (2012-2018)	SA-92
F	Defined Terms Document

LETTER AGREEMENTS

1810-1R1 Waiver of Aircraft Demonstration Flight SA-75

P.A. No. 1810	ii
K/SWA		SA-92

TABLE OF CONTENTS
	SA
	Number

RESTRICTED LETTER AGREEMENTS

6‑1162‑RLL‑932R3	***	SA-75
6‑1162‑RLL‑934R5	Disclosure of Confidential Information	SA-75
6‑1162‑RLL‑941R3	Other Matters	SA-75
6-1162-KJJ-055R1	Structural Matters	SA-25
6-1162-KJJ-056	Noise and Emission Matters	SA-13
6-1162-KJJ-057	Product Development Matters	SA-13
SWA-PA-1810-LA-1001315R4	***	SA-92
	Attachment A	SA-92
SWA-PA-1810-LA-1003498R1	***	SA-75
SWA-PA-1810-LA-1003490R4	***	SA-92
SWA-PA-1810-LA-1003367R1	***	SA-75
SWA-PA-1810-LA-1105883	Aircraft Model Substitution	SA-75
SWA-PA-1810-LA-1105884R2	Option Aircraft	SA-92
	Attachment A - Model 737-8H4 Aircraft	SA-92
	Attachment B - Option Aircraft Information Table	SA-92
SWA-PA-1810-LA-1105885R3	***	SA-90
SWA-PA-1810-LA-1105886R2	***	SA-92
SWA-PA-1810-LA-1105887	***	SA-75
SWA-PA-1810-LA-1105888R5	***	SA-92
SWA-PA-1810-LA-1105889	***	SA-75
SWA-PA-1810-LA-1303010R1	***	SA-92
SWA-PA-1810-LA-1504814	***	SA-92

P.A. No. 1810	iii
K/SWA		SA-92

TABLE OF CONTENTS

ADDITIONAL LETTERS (FOR REFERENCE) - INACTIVE (as of SA-82)
6-1162-MSA-288	Business Offer - Enhanced Ground Proximity
	Warning System (EGPWS) - Activiation - Peaks
	and Obstacles Feature
	(Not applicable to Block 700LUV & Block 800LUV Aircraft)
6-1162-JMG-501R2	Business Offer - ACARS package
	(Not applicable to Block 700LUV & Block 800LUV Aircraft)

INACTIVE / DELETED TABLES, EXHIBITS, AND LETTER AGREEMENTS

TABLE

Table		Last Updated under SA	Current Status
1	Aircraft Information Table	SA-75	Inactive
2	Option Aircraft Information Table	SA-74	Deleted under SA-75
1a	Aircraft Information Table - Block 700LUV Aircraft	SA-91	Deleted Under SA-92

EXHIBITS

Exhibits	Title	Last Updated under SA	Current Status
A	Aircraft Configuration - 737-700	SA-36	Inactive
A-Winglet	Aircraft Configuration	SA-36	Inactive
A-1-Winglet	Aircraft Configuration	SA-36	Inactive
A-1A	Aircraft Configuration - 737-700 Block T-W-2c	SA-36	Inactive
A-2	Aircraft Configuration - 737-700 Block T-W-2 / T-W-2a	SA-47	Inactive
A-3	Aircraft Configuration - 737-700 Block T-W-2 / T-W-2a	SA-61	Inactive
A-4	Aircraft Configuration - 737-700 Block T-W-2b Aircraft	SA-66	Inactive
A-5	Aircraft Configuration - Block 700LUV Aircraft	SA-75	Deleted under SA-92
C.2	737-800 Customer Support Variables	SA-71	Deleted under SA-75
D	Price Adjustment Due to Economic Fluctuations - Aircraft Price Adjustment (July 1992 Base Price)		Inactive
D-1	Price Adjustment Due to Economic Fluctuations -	SA-13	Inactive

P.A. No. 1810	iv
K/SWA		SA-92

TABLE OF CONTENTS

Exhibits	Title	Lase Updated under SA	Current Status
	Aircraft Price Adjustment (July 1999 Base Price)
E.2	737-800 Buyer Furnished Equipment Provisions Document	SA-73	Deleted under SA-75

RESTRICTED LETTER AGREEMENTS

Letter Agreement	Title	Last Updated under SA	Current Status
6‑1162‑RLL‑933R21	Option Aircraft	SA-60	Deleted under SA-75
6‑1162‑RLL‑935R1	Performance Guarantees	SA-1	Inactive
6‑1162‑RLL‑936R4	Certain Contractual Matters	SA-4	Inactive
6‑1162‑RLL‑937	Alternate Advance Payment Schedule		Inactive
6‑1162‑RLL‑938	***		Inactive
6‑1162‑RLL‑939R1	Certification Flight Test Aircraft	SA-1	Inactive
6‑1162‑RLL‑940R1	Training Matters	SA-1	Inactive
6‑1162‑RLL‑942	Open Configuration Matters		Inactive
6‑1162‑RLL‑943R1	Substitution Rights	SA-6	Deleted under SA 75
6‑1162‑RLL‑944	***		Inactive
6-1162-RLL-945	Comparison of 737-7H4 and 737-3H4 Block Fuel Burn		Inactive
6-1162-RLL-1855R3	Additional Contractual Matters	SA-4	Inactive
6-1162-RLL-1856	***	SA-1	Inactive
6-1162-RLL-1857	Service Ready Validation Program Field Test	SA-1	Inactive
6-1162-RLL-1858R1	Escalation Matters	SA-4	Inactive
6-1162-RLL-2036	Amortization of Costs for Customer Unique Changes	SA-1	Inactive
6-1162-RLL-2037	Reconciliation of the Aircraft Basic Price	SA-1	Inactive
6-1162-RLL-2073	Maintenance Training Matters	SA-1	Inactive
6-1162-KJJ-058R1	Additional Substitution Rights	SA-71	Deleted under SA-75
6-1162-KJJ-150	Flight Control Computer & Mode Control Panel Spares Matter	SA-14	Inactive
6-1162-MSA-185R3	Delivery Change Contractual Matters	SA-21	Inactive
6-1162-JMG-747R1	***	SA-36	Inactive

P.A. No. 1810	v
K/SWA		SA-92

TABLE OF CONTENTS

Letter Agreement	Title	Last Updated under SA	Current Status
6-1162-CHL-217	Rescheduled Flight Test Aircraft	SA-32	Inactive
6-1162-NIW-606R1	***	SA-36	Inactive
6-1162-NIW-640	Early Delivery of Two April 2004 Aircraft	SA-35	Inactive
6-1162-NIW-889	Warranty - Exterior Color Schemes and Markings for YA143 and on	SA-39	Inactive
6-1162-NIW-1142	***	SA-43	Inactive
6-1162-NIW-1369	***	SA-46	Inactive
6-1162-NIW-1983	***	SA-62	Inactive
SWA-PA-1810-LA-1000419	***	SA-64	Inactive
6-1162-NIW-890R1	***	SA-75 SA-39	Inactive
6-1162-KJJ-054R2	Business Matters	SA-75	Inactive
6-1162-JMG-669R9	***	SA-75 SA-75 SA-54	Inactive
SWA-PA-1810-LA-02710R1	***	SA-72	Inactive
SWA-PA-01810/03729-LA-1301169	***	SA-2 to PA 3729	Inactive

P.A. No. 1810	vi
K/SWA		SA-92

ARTICLE 1.    Subject Matter of Sale.

1.1    The Aircraft.

1.1.1    The Aircraft - Model 737-700 (Block A through L, Block T, and Block 700LUV). Subject to the terms and conditions of this Agreement, Boeing will manufacture and deliver to Buyer and Buyer will purchase and accept delivery from Boeing of the Boeing Model 737‑7H4 aircraft listed in Table 1 and Table 1a, “Aircraft Information Table,” of this Agreement which are identified therein as the Block A through L Aircraft, Block T Aircraft (including Block T-W, T-W-1/T-W-1a, T-W-2/T-W-2a, T-W-2b, and T-W-2c), and Block 700LUV Aircraft, collectively referred to as the “737-7H4 Aircraft,” and manufactured in accordance with the configuration described in Exhibit A, Exhibit A-Winglet, Exhibit A-1-Winglet, Exhibit A-1A, Exhibit A-2, Exhibit A-3, Exhibit A-4, or Exhibit A-5 as applicable, as modified from time to time in accordance with this Agreement (737-7H4 Detail Specification).

1.1.2    The Aircraft - Model 737-800 (Block 800LUV). Subject to the terms and conditions of this Agreement, Boeing will manufacture and deliver to Buyer and Buyer will purchase and accept delivery from Boeing of the Boeing Model 737‑8H4 aircraft listed in Table 1b, Table 1c and Table 1d, “Aircraft Information Table,” to this Agreement which are identified therein as the Block 800LUV Aircraft, referred to as the “737-8H4 Aircraft,” and manufactured in accordance with the configuration described in Exhibit A-6 and Exhibit A-7, as applicable and as modified from time to time in accordance with this Agreement (737-8H4 Detail Specification).

1.1.3    The 737-7H4 Aircraft and 737-8H4 Aircraft described in this Article 1 shall be collectively referred to as the Aircraft (the Aircraft); and

1.1.4    The 737-7H4 Detail Specification and 737-8H4 Detail Specification described in this Article 1 shall be collectively referred to as the Detail Specification (Detail Specification).

1.2    Additional Goods and Services. In connection with the sale of the Aircraft, Boeing will also provide to Buyer certain other things under this Agreement, including data, documents, training and services, all as described in this Agreement.

1.3    Performance Guarantees. Any performance guarantees applicable to the Aircraft will be expressly included in this Agreement. Where performance guarantees are included in this Agreement other than within the Detail

P.A. No. 1810	1-1
		SA-92

Specification, such guarantees will be treated as being incorporated in the Detail Specification by this reference.

1.4    Defined Terms. For ease of use, certain terms are treated as defined terms in this Agreement. Such terms are identified with a capital letter and set forth and/or defined in Exhibit F.

P.A. No. 1810	1-2
		SA-92

ARTICLE 3.    Price of Aircraft.

3.1    Definitions.

3.1.1    Special Features are the features incorporated in Exhibit A, Exhibit A-Winglet, Exhibit A-1-Winglet, Exhibit A-1A, Exhibit A-3, Exhibit A-4, Exhibit A-5, Exhibit A-6, or Exhibit A-7 collectively referred to as “Exhibit A,” as applicable, which have been selected by Buyer.

3.1.2    Base Aircraft Price is the Aircraft Basic Price excluding the price of Special Features.

3.1.3    Aircraft Basic Price is comprised of the Base Aircraft Price and the price of the Special Features.

3.1.4    Economic Price Adjustment is the adjustment to the Aircraft Basic Price (Base Aircraft and Special Features) as calculated pursuant to Exhibit D, Exhibit D-1, or Exhibit D-2 as applicable.

3.1.5    Aircraft Price is the total amount Buyer is to pay for the Aircraft at the time of delivery.

3.2    Aircraft Basic Price.

3.2.1    The Aircraft Basic Price for Block A through L Aircraft, is expressed in July 1992 dollars.

3.2.2    The Aircraft Basic Price for Block T Aircraft, Block T-W Aircraft, Block T-W-1 Aircraft, Block T-W-1a Aircraft, Block T-W-2 Aircraft Block T-W-2a Aircraft, Block T-W-2b, and Block T-W-2c is expressed in July 1999 dollars as set forth in Table 1 of the Agreement.

3.2.3    The Aircraft Basic Price for Block 700LUV Aircraft and Block 800LUV Aircraft is expressed in July 2011 dollars as set forth in Table 1a and Tables 1b, 1c and 1d, respectively, of the Agreement.

3.3    Aircraft Price. The Aircraft Price will be established at the time of delivery of such Aircraft to Buyer and will be the sum of:

3.3.1    the Aircraft Basic Price, which is *** for the Block A, B, C, D and E Aircraft,*** for the Block F and G Aircraft,*** for the Block H Aircraft,*** for the Block I Aircraft,

P.A. No. 1810	3-1	SA-92
K/SWA

*** for the Block J Aircraft, *** for the Block K Aircraft and *** for the Block L Aircraft, *** for the Block T Aircraft, ***for the Block T-W Aircraft, *** for the Block T-W-1 Aircraft, the Block T-W-1a Aircraft, the Block T-W-2 Aircraft, the Block T-W-2a, *** for the Block T-W-2b Aircraft, *** for the Block T-W-2c Aircraft, *** for the Block 700LUV Aircraft, and *** for the Block 800LUV Aircraft; plus

3.3.2    the Economic Price Adjustments for the Aircraft Basic Price, as calculated pursuant to the formulas set forth in Exhibit D (Price Adjustments Due to Economic Fluctuations - Aircraft) for Block A through L Aircraft; in Exhibit D-1 (Price Adjustments Due to Economic Fluctuations - Aircraft) for Block T Aircraft, Block T-W Aircraft, Block T-W-1 Aircraft, Block T-W-1a Aircraft, Block T-W-2 Aircraft, Block T-W-2a Aircraft, Block T-W-2b Aircraft, and Block T-W-2c Aircraft; and in Exhibit D-2 (Price Adjustment Due to Economic Fluctuations - Aircraft Price Adjustment) for Block 700LUV Aircraft and Block 800LUV Aircraft; plus

3.3.3    other price adjustments made pursuant to this Agreement or other written agreements executed by Boeing and Buyer.

3.4    Advance Payment Base Price.

3.4.1    Advance Payment Base Price. For advance payment purposes, the following estimated delivery prices of the Aircraft (Advance Payment Base Price) have been established, using currently available forecasts of the escalation factors used by Boeing as of the date of signing this Agreement, or as of the date amended. The Advance Payment Base Price of each Aircraft is set forth in Table 1, Table 1a, Table 1b, Table 1c and Table 1d.

3.4.2    Adjustment of Advance Payment Base Prices - Long‑Lead Aircraft (Aircraft with delivery prior to 2012). For Aircraft scheduled for delivery 36 months or more after the date of this Agreement, the Advance Payment Base Prices

P.A. No. 1810	3-2	SA-92
K/SWA

appearing in Table 1 will be used to determine the amount of the first advance payment to be made by Buyer on the Aircraft. No later than 25 months before the scheduled month of delivery of each affected Aircraft, Boeing will increase or decrease the Advance Payment Base Price of such Aircraft as required to reflect the effects of (i) any adjustments in the Aircraft Basic Price pursuant to this Agreement and (ii) the then‑current forecasted escalation factors used by Boeing. Boeing will provide the adjusted Advance Payment Base Prices for each affected Aircraft to Buyer, and the advance payment schedule will be considered amended to substitute such adjusted Advance Payment Base Price.

P.A. No. 1810	3-3	SA-92
K/SWA

Table 1c to

Purchase Agreement No. PA-01810

Aircraft Delivery, Description, Price and Advance Payments

Block 800LUV Aircraft (non-ETOPS Configuration)

Airframe Model/MTOW: 737-800 174200 pounds Detail Specification: D019A001SWA38P-1 Rev C (3/29/2013)

Engine Model/Thrust: CFM56-7B27 27300 pounds Note 1 Base Aircraft Price Base Year/Escalation Formula: Jul-11 ECI-MFG/CPI

Base Aircraft Price: *** Engine Price Base Year/Escalation Formula: N/A N/A

Special Features: ***

Add'l Features/Changes ***

Total Special Features (Exhibit A-7) ***

Sub-Total of Airframe and Features: *** Aircraft Price Escalation Data:

Engine Price (Per Aircraft): *** Base Year Index (ECI): ***

Aircraft Basic Price (Excluding BFE/SPE): *** Base Year Index (CPI): ***

Buyer Furnished Equipment (BFE) Estimate: ***

Seller Purchased Equipment (SPE) Estimate: ***

Delivery Date	Number of Aircraft	Escalation Factor (Airframe)	Aircraft Serial Number	Escalation Forecast	Sub-Block Note 2	Escalation Estimate Adv Payment Base Price Per A/P	Advance Payment Per Aircraft (Amts. Due/Mos. Prior to Delivery):
							At Signing ***	24 Mos. ***	21/18/12/9/6 Mos. ***	Total ***
Sep-2013	3	***	36933, 36912, 36914	***		***	***	***	***	***
Nov-2013	3	***	36915, 33939, 42526	***		***	***	***	***	***
Dec-2013	3	***	36917, 36919, 36731	***		***	***	***	***	***
Mar-2014	2	***	37004, 36896	***		***	***	***	***	***
Apr-2014	3	***	42384, 36894, 36895	***		***	***	***	***	***
May-2014	3	***	36897, 42385, 42521	***		***	***	***	***	***
Jun-2014	4	***	36898, 36905, 42522, 42523	***		***	***	***	***	***
Jun-2014	2	***	60082, 60083	***	OPEX	***	***	***	***	***
Jul-2014	1	***	36911	***		***	***	***	***	***
Jul-2014	3	***	60084, 60085, 60086	***	OPEX	***	***	***	***	***
Aug-2014	4	***	36907, 42525, 36935, 42528	***		***	***	***	***	***
Sep-2014	2	***	42527, 42531	***		***	***	***	***	***
Sep-2014	1	***	36909	***		***	***	***	***	***
Oct-2014	1	***	36920	***		***	***	***	***	***
Nov-2014	1	***	36971	***		***	***	***	***	***

SWA-PA-01810		SA-92
63879 / 63887 / 64110 / 64111 / 66379 / 68788 / 70150 / 73631 / 82233	Boeing Proprietary	Page 1

Table 1c to

Purchase Agreement No. PA-01810

Aircraft Delivery, Description, Price and Advance Payments

Block 800LUV Aircraft (non-ETOPS Configuration)

Delivery Date	Number of Aircraft	Escalation Factor (Airframe)	Aircraft Serial Number	Escalation Forecast	Sub-Block Note 2	Escalation Estimate Adv Payment Base Price Per A/P	Advance Payment Per Aircraft (Amts. Due/Mos. Prior to Delivery):
							At Signing ***	24 Mos. ***	21/18/12/9/6 Mos. ***	Total ***
Dec-2014	2	***	37037, 37045	***		***	***	***	***	***
Dec-2014	2	***	42529, 42530	***		***	***	***	***	***
Dec-2014	2	***Note 3	42524, 35973	***		***	***	***	***	***
Jan-2015	2	***	36899, 42535	***		***	***	***	***	***
Feb-2015	3	***	36901, 36654, 36906	***		***	***	***	***	***
Mar-2015	2	***	36902, 36936	***		***	***	***	***	***
Apr-2015	2	***	36649, 36652	***		***	***	***	***	***
May-2015	2	***	36903, 36657	***		***	***	***	***	***
Jun-2015	2	***	36655, 36656	***		***	***	***	***	***
Nov-2015	3	***	36937, 36715, 36940	***		***	***	***	***	***
Dec-2015	3	***	36941, 36734, 35976	***		***	***	***	***	***
Jan-2016	2	***	36650, 36735	***		***	***	***	***	***
Feb-2016	3	***	36904, 36932, 36737	***		***	***	***	***	***
Mar-2016	2	***	36651, 36738	***		***	***	***	***	***
Apr-2016	1	***	36653	***		***	***	***	***	***
May-2016	5	***	36658, 36939, 33937, 36938, 36723	***		***	***	***	***	***
Jun-2016	1	***	36916	***		***	***	***	***	***
Jul-2016	3	***	36921, 36945, 33942	***		***	***	***	***	***
Aug-2016	4	***	36678, 36661, 35965, 36728	***		***	***	***	***	***
Sep-2016	3	***	36977, 36923, 41530	***		***	***	***	***	***
Oct-2016	3	***	36666, 38812, 38813	***		***	***	***	***	***
Nov-2016	3	***	36670, 38814, 41531	***		***	***	***	***	***
Nov-2016	2	***	36925, 36944	***		***	***	***	***	***
Dec-2016	1	***	38816	***		***	***	***	***	***
Dec-2016	3	***	36975, 36943, 36976	***		***	***	***	***	***
Jan-2017	2	***	42532, 36910	***		***	***	***	***	***
Feb-2017	3	***	36969, 36970, 36922	***		***	***	***	***	***
Mar-2017	3	***	36972, 36949, 36946	***		***	***	***	***	***
Apr-2017	2	***	36974, 36927	***		***	***	***	***	***

SWA-PA-01810		SA-92
63879 / 63887 / 64110 / 64111 / 66379 / 68788 / 70150 / 73631 / 82233	Boeing Proprietary	Page 2

Table 1c to

Purchase Agreement No. PA-01810

Aircraft Delivery, Description, Price and Advance Payments

Block 800LUV Aircraft (non-ETOPS Configuration)

Delivery Date	Number of Aircraft	Escalation Factor (Airframe)	Aircraft Serial Number	Escalation Forecast	Sub-Block Note 2	Escalation Estimate Adv Payment Base Price Per A/P	Advance Payment Per Aircraft (Amts. Due/Mos. Prior to Delivery):
							At Signing ***	24 Mos. ***	21/18/12/9/6 Mos. ***	Total ***
Jan-2018	1	***	36926	***		***	***	***	***	***
Feb-2018	2	***	42545, 42533	***		***	***	***	***	***
Mar-2018	2	***	42534, 36928	***		***	***	***	***	***
Apr-2018	3	***	36968, 36952, 36954	***		***	***	***	***	***
May-2018	2	***	36951, 36957	***		***	***	***	***	***
Total:	117

Notes:

1) ***

2) The sub-block identifier is used to denote applicability of certain business terms as referenced in Letter Agreement SWA-PA-1810-LA-1105888R4 to the Purchase Agreement.

3) ***

SWA-PA-01810		SA-92
63879 / 63887 / 64110 / 64111 / 66379 / 68788 / 70150 / 73631 / 82233	Boeing Proprietary	Page 3

Table 1d To

Purchase Agreement No. PA-01810

Aircraft Delivery, Description, Price and Advance Payments

Block 800LUV Aircraft (non-ETOPS Configuration)

Airframe Model/MTOW: 737-800 174,200 pounds Detail Specification: D019A001SWA38 (1/9/2015)

Engine Model/Thrust: CFM56-7B27 27,300 pounds Airframe Price Base Year/Escalation Formula: Jul-11 ECI-MFG/CPI

Airframe Price: *** Engine Price Base Year/Escalation Formula: N/A N/A

Optional Features: ***

Sub-Total of Airframe and Features: *** Airframe Escalation Data:

Engine Price (Per Aircraft): *** Base Year Index (ECI): ***

Aircraft Basic Price (Excluding BFE/SPE): *** Base Year Index (CPI): ***

Buyer Furnished Equipment (BFE) Estimate: ***

Seller Purchased Equipment (SPE) Estimate: ***

Deposit per Exercised Option Aircraft (OPEX): ***

Delivery Date	Number of Aircraft	Escalation Factor (Airframe)	Aircraft Serial Number		Escalation Estimate Adv Payment Base Price Per A/P	Advance Payment Per Aircraft (Amts. Due/Mos. Prior to Delivery):
						At Signing ***	24 Mos. ***	21/18/12/9/6 Mos. ***	Total ***
May-2017	2	***		OPEX	***	***	***	***	***
Jun-2017	1	***		OPEX	***	***	***	***	***
Jul-2017	1	***			***	***	***	***	***
Jul-2017	2	***		OPEX	***	***	***	***	***
Sep-2017	5	***			***	***	***	***	***
Oct-2017	3	***			***	***	***	***	***
Oct-2017	1	***		OPEX	***	***	***	***	***
Nov-2017	2	***			***	***	***	***	***
Nov-2017	2	***		OPEX	***	***	***	***	***
Dec-2017	2	***			***	***	***	***	***
Dec-2017	4	***		OPEX	***	***	***	***	***
Jan-2018	2	***			***	***	***	***	***
Feb-2018	2	***			***	***	***	***	***

SWA-PA-01810		SA-92
82233	Boeing Proprietary	Page 1

Table 1d To

Purchase Agreement No. PA-01810

Aircraft Delivery, Description, Price and Advance Payments

Block 800LUV Aircraft (non-ETOPS Configuration)

Delivery Date	Number of Aircraft	Escalation Factor (Airframe)	Aircraft Serial Number	Escalation Estimate Adv Payment Base Price Per A/P	Advance Payment Per Aircraft (Amts. Due/Mos. Prior to Delivery):
					At Signing ***	24 Mos. ***	21/18/12/9/6 Mos. ***	Total ***
May-2018	2	***		***	***	***	***	***
Jun-2018	2	***		***	***	***	***	***
Total:	33

Notes:

1) ***

SWA-PA-01810		SA-92
82233	Boeing Proprietary	Page 2

Attachment B to Exhibit E of PA 1810

BUYER FURNISHED EQUIPMENT VARIABLES

relating to

BOEING MODEL737-7H4 and 737-8H4 AIRCRAFT

This Attachment B to Exhibit E of Purchase Agreement No. 1810 contains supplier selection dates, preliminary on-dock dates and other requirements applicable to the 737-7H4 Aircraft and 737-8H4 Aircraft.

1. Supplier Selection for 737-8H4 Aircraft.

Buyer will select and notify Boeing of the suppliers and part numbers of the following BFE items by the following dates:

Galley System	March 1, 2011 Completed
Galley Inserts	March 1, 2011 Completed
Seats (passenger)	January 17, 2011 Completed
Miscellaneous Emergency Equipment	March 1, 2011 Completed

2. Preliminary On-dock Dates for 737-7H4 Aircraft & 737-8H4 Aircraft.

For planning purposes, preliminary BFE on-dock dates are set forth below:

	Preliminary On-Dock Dates Month of Delivery
Item	Mar 2012	Apr 2012	May 2012	Jun-2012	Jul 2012	Aug 2012	Sep 2012
Seats	1/23/2012	2/21/2012	3/22/2012	4/20/2012	5/22/2012	6/21/2012	7/23/2012
Galleys/Furnishings	1/16/2012	2/14/2012	3/15/2012	4/13/2012	5/15/2012	6/14/2012	7/16/2012
Antennas & Mounting Equipment	11/23/2011	12/21/2011	1/23/2012	2/20/2012	3/22/2012	4/20/2012	5/23/2012
Avionics	1/16/2012	2/14/2012	3/15/2012	4/13/2012	5/15/2012	6/14/2012	7/16/2012
Cabin Systems Equipment	1/16/2012	2/14/2012	3/15/2012	4/13/2012	5/15/2012	6/14/2012	7/16/2012

Attachment B to Exhibit E of PA 1810		SA-92
		Page 1
	BOEING PROPRIETARY

Miscellaneous Emergency Equipment	1/16/2012	2/14/2012	3/15/2012	4/13/2012	5/15/2012	6/14/2012	7/16/2012
Textiles/Raw Material	9/29/2011	10/28/2011	12/1/2011	1/10/2012	2/9/2012	3/9/2012	4/9/2012
Cargo Systems (Singe Aisle Programs)	1/3/2012	1/31/2012	3/1/2012	3/30/2012	5/1/2012	5/31/2012	7/2/2012
Provision Kits (Single Aisle Programs)	9/2/2011	9/30/2011	11/1/2011	11/30/2011	1/3/2012	1/31/2012	3/2/2012
Radomes (Single Aisle Programs)	12/16/2011	1/13/2012	2/15/2012	3/13/2012	4/16/2012	5/14/2012	6/15/2012

	Preliminary On-Dock Dates Month of Delivery
Item	Oct 2012	Nov 2012	Dec 2012	Jan-2013	Feb-2013	Mar-2013	Apr-2013
Seats	8/23/2012	9/20/2012	10/23/2012	11/20/2012	12/13/2012	1/23/2013	2/20/2013
Galleys/Furnishings	8/16/2012	9/13/2012	10/16/2012	11/13/2012	12/6/2012	1/16/2013	2/13/2013
Antennas & Mounting Equipment	6/22/2012	7/20/2012	8/23/2012	9/20/2012	10/12/2012	11/21/2012	12/20/2012
Avionics	8/16/2012	9/13/2012	10/16/2012	11/13/2012	12/6/2012	1/16/2013	2/13/2013
Cabin Systems Equipment	8/16/2012	9/13/2012	10/16/2012	11/13/2012	12/6/2012	1/16/2013	2/13/2013
Miscellaneous Emergency Equipment	8/16/2012	9/13/2012	10/16/2012	11/13/2012	12/6/2012	1/16/2013	2/13/2013
Textiles/Raw Material	5/10/2012	6/7/2012	7/11/2012	8/8/2012	8/29/2012	10/1/2012	10/29/2013
Cargo Systems (Singe Aisle Programs)	8/2/2012	8/30/2012	10/2/2012	10/30/2012	11/21/2012	1/2/2013	1/30/2013
Provision Kits (Single Aisle Programs)	4/2/2012	4/30/2012	6/1/2012	6/29/2012	7/20/2012	9/4/2012	10/1/2012
Radomes (Single Aisle Programs)	7/16/2012	8/13/2012	9/17/2012	10/12/2012	11/6/2012	12/17/2012	1/13/2013

	Preliminary On-Dock Dates Month of Delivery
Item	May-2013	Jun-2013	July 2013	Aug 2013	Sep 2013	Oct 2013	Nov 2013
Seats	3/21/2013	4/22/2013	5/22/2013	6/20/2013	7/23/2013	8/22/2013	9/20/2013
Galleys/Furnishings	3/14/2013	4/15/2013	5/15/2013	6/13/2013	7/16/2013	8/15/2013	9/13/2013
Antennas & Mounting Equipment	1/21/2013	2/22/2013	3/22/2013	4/19/2013	5/23/2013	6/21/2013	7/19/2013
Avionics	3/14/2013	4/15/2013	5/15/2013	6/13/2013	7/16/2013	8/15/2013	9/13/2013
Cabin Systems Equipment	3/14/2013	4/15/2013	5/15/2013	6/13/2013	7/16/2013	8/15/2013	9/13/2013

Attachment B to Exhibit E of PA 1810		SA-92
		Page 2
	BOEING PROPRIETARY

Miscellaneous Emergency Equipment	3/14/2013	4/15/2013	5/15/2013	6/13/2013	7/16/2013	8/15/2013	9/13/2013
Textiles/Raw Material	11/29/2012	1/9/2013	2/8/2013	4/5/2013	4/9/2013	5/9/2013	6/7/2013
Cargo Systems (Singe Aisle Programs)	3/1/2013	4/1/2013	5/1/2013	5/30/2013	7/2/2013	8/1/2013	8/30/2013
Provision Kits (Single Aisle Programs)	11/1/2012	12/3/2012	1/2/2013	1/30/2013	3/1/2013	4/1/2013	4/30/2013
Radomes (Single Aisle Programs)	2/14/2013	3/15/2013	4/15/2013	5/13/2013	6/17/2013	7/15/2013	8/13/2013

	Preliminary On-Dock Dates Month of Delivery
Item	Dec 2013	Jan 2014	Feb 2014	Mar-2014	Apr 2014	May 2014	Jun 2014
Seats	10/23/2013	11/19/2013	12/13/2013	1/23/2014	2/20/2014	3/21/2014	4/22/2014
Galleys/Furnishings	10/16/2013	11/12/2013	12/6/2013	1/16/2014	2/13/2014	3/14/2014	4/15/2014
Antennas & Mounting Equipment	8/23/2013	9/19/2013	10/14/2013	11/22/2013	12/20/2013	1/21/2014	2/21/2014
Avionics	10/16/2013	11/12/2013	12/6/2013	1/16/2014	2/13/2014	3/14/2014	4/15/2014
Cabin Systems Equipment	10/16/2013	11/12/2013	12/6/2013	1/16/2014	2/13/2014	3/14/2014	4/15/2014
Miscellaneous Emergency Equipment	10/16/2013	11/12/2013	12/6/2013	1/16/2014	2/13/2014	3/14/2014	4/15/2014
Textiles/Raw Material	7/11/2013	8/7/2013	8/29/2013	10/1/2013	10/29/2013	11/27/2013	1/9/2014
Cargo Systems (Singe Aisle Programs)	10/2/2013	10/29/2013	11/22/2013	1/2/2014	1/30/2014	3/1/2014	4/2/2014
Provision Kits (Single Aisle Programs)	6/3/2013	6/28/2013	7/22/2013	9/3/2013	9/30/2013	11/1/2013	12/2/2013
Radomes (Single Aisle Programs)	10/11/2013	10/11/2013	11/6/2013	12/16/2013	1/13/2014	2/14/2014	3/14/2014

	Preliminary On-Dock Dates Month of Delivery
Item	Jul 2014	Aug 2014	Sep 2014	Oct 2014	Nov 2014	Dec 2014	Jan 2015
Seats	5/21/2014	6/20/2014	7/23/2014	8/21/2014	9/23/2014	10/24/2014	11/18/2014
Galleys/Furnishings	5/14/2014	6/13/2014	7/16/2014	8/14/2014	9/16/2014	10/17/2014	11/11/2014
Antennas & Mounting Equipment	3/21/2014	6/13/2014	5/23/2014	6/20/2014	7/23/2014	8/25/2014	9/18/2014
Avionics	5/14/2014	4/21/2014	7/16/2014	8/14/2014	9/16/2014	10/17/2014	11/11/2014
Cabin Systems Equipment	5/14/2014	4/21/2014	7/16/2014	8/14/2014	9/16/2014	10/17/2014	11/11/2014

Attachment B to Exhibit E of PA 1810		SA-92
		Page 3
	BOEING PROPRIETARY

Miscellaneous Emergency Equipment	5/14/2014	4/21/2014	7/16/2014	8/14/2014	9/16/2014	10/17/2014	11/11/2014
Textiles/Raw Material	2/7/2014	3/10/2014	4/9/2014	5/8/2014	6/10/2014	7/14/2014	8/6/2014
Cargo Systems (Singe Aisle Programs)	5/1/2014	5/30/2014	7/2/2014	7/31/2014	9/2/2014	10/3/2014	10/28/2014
Provision Kits (Single Aisle Programs)	1/2/2014	1/30/2014	3/3/2014	3/31/2014	5/2/2014	8/4/2014	6/27/2014
Radomes (Single Aisle Programs)	4/14/2014	5/13/2014	6/16/2014	7/14/2014	8/15/2014	9/17/2014	10/10/2014

	Preliminary On-Dock Dates Month of Delivery
Item	Feb 2015	Mar 2015	Apr 2015	May 2015	Jun 2015	Jul 2015
Seats	12/15/2014	1/22/2015	2/19/2015	3/23/2015	4/22/2015	5/21/2015
Galleys/Furnishings	12/8/2014	1/15/2015	2/12/2015	3/16/2015	4/15/2015	5/14/2015
Antennas & Mounting Equipment	10/15/2014	11/21/2014	12/19/2014	1/23/2015	2/23/2015	3/20/2015
Avionics	12/8/2014	1/15/2015	2/12/2015	3/16/2015	4/15/2015	3/13/2015
Cabin Systems Equipment	12/8/2014	1/15/2015	2/12/2015	3/16/2015	4/15/2015	5/14/2015
Miscellaneous Emergency Equipment	12/8/2014	1/15/2015	2/12/2015	3/16/2015	4/15/2015	5/14/2015
Textiles/Raw Material	8/29/2014	11/17/2014	10/28/2014	12/1/2014	1/9/2015	5/14/2015
Cargo Systems (Singe Aisle Programs)	11/24/2014	1/2/2015	1/29/2015	3/2/2015	4/1/2015	4/30/2015
Provision Kits (Single Aisle Programs)	7/24/2014	9/2/2014	9/29/2014	11/2/2015	12/1/2014	12/23/2014
Radomes (Single Aisle Programs)	11/7/2014	12/15/2014	1/12/2015	2/16/2015	3/16/2015	4/14/2015

	Preliminary On-Dock Dates Month of Delivery
Item	Aug 2015	Sep 2015	Oct 2015	Nov 2015	Dec 2015	Jan 2016
Seats	6/22/2015	7/23/2015	8/21/2015	9/22/2015	10/22/2015	11/18/2015
Galleys/Furnishings	6/15/2015	7/16/2015	8/14/2015	9/15/2015	10/15/2015	11/11/2015
Antennas & Mounting Equipment	4/22/2015	5/22/2015	6/22/2015	7/22/2015	8/21/2015	9/18/2016
Avionics	6/15/2015	7/16/2015	8/14/2015	9/15/2015	10/15/2015	11/11/2015
Cabin Systems Equipment	6/15/2015	7/16/2015	8/14/2015	9/15/2015	10/15/2015	11/11/2015

Attachment B to Exhibit E of PA 1810		SA-92
		Page 4
	BOEING PROPRIETARY

Miscellaneous Emergency Equipment	6/15/2015	7/16/2015	8/14/2015	9/15/2015	10/15/2015	11/11/2015
Textiles/Raw Material	3/10/2015	4/9/2015	5/8/2015	6/9/2015	7/10/2015	8/6/2015
Cargo Systems (Singe Aisle Programs)	5/1/2015	7/2/2015	8/1/2015	9/1/2015	10/1/2015	10/28/2015
Provision Kits (Single Aisle Programs)	2/2/2015	3/2/2015	4/1/2015	5/1/2015	6/1/2015	6/29/2015
Radomes (Single Aisle Programs)	5/15/2015	6/16/2015	7/14/2015	8/14/2015	9/15/2015	10/12/2015

	Preliminary On-Dock Dates Month of Delivery
Item	Feb 2016	Mar 2016	Apr 2016	May 2016	Jun 2016	Jul 2016
Seats	12/15/2015	1/21/2016	2/19/2016	3/23/2016	4/21/2016	5/20/2016
Galleys/Furnishings	12/8/2015	1/14/2016	2/12/2016	3/16/2016	4/14/2016	5/13/2016
Antennas & Mounting Equipment	10/15/2015	11/20/2015	12/18/2015	1/22/2016	2/22/2016	3/21/2016
Avionics	12/8/2015	1/14/2016	2/12/2016	3/16/2016	4/14/2016	5/13/2016
Cabin Systems Equipment	12/8/2015	1/14/2016	2/12/2016	3/16/2016	4/14/2016	5/13/2016
Miscellaneous Emergency Equipment	12/8/2015	1/14/2016	2/12/2016	3/16/2016	4/14/2016	5/13/2016
Textiles/Raw Material	8/31/2015	9/29/2015	10/28/2015	12/2/2015	1/11/2016	2/9/2016
Cargo Systems (Singe Aisle Programs)	11/24/2015	12/23/2015	1/29/2016	3/2/2016	3/31/2016	4/29/2016
Provision Kits (Single Aisle Programs)	7/24/2015	8/24/2015	9/29/2015	11/2/2105	12/1/2015	12/23/2015
Radomes (Single Aisle Programs)	11/9/2015	12/14/2015	1/12/2016	2/16/2016	3/14/2016	4/13/2016

	Preliminary On-Dock Dates Month of Delivery
Item	Aug 2016	Sep 2016	Oct 2016	Nov 2016	Dec 2016	Jan 2017
Seats	6/22/2015	7/21/2016	8/23/2016	9/22/2016	10/21/2016	11/18/2016
Galleys/Furnishings	6/15/2016	7/14/2016	8/16/2016	9/15/2016	10/14/2016	11/11/2016
Antennas & Mounting Equipment	4/22/2016	5/20/2016	6/23/2016	7/22/2016	8/22/2106	9/19/2016
Avionics	6/15/2016	7/14/2016	8/16/2016	9/15/2016	10/14/2016	11/11/2016
Cabin Systems Equipment	6/15/2016	7/14/2016	8/16/2016	9/15/2016	10/14/2016	11/11/2016

Attachment B to Exhibit E of PA 1810		SA-92
		Page 5
	BOEING PROPRIETARY

Miscellaneous Emergency Equipment	6/15/2016	7/14/2016	8/16/2016	9/15/2016	10/14/2016	11/11/2016
Textiles/Raw Material	3/10/2016	4/7/2016	5/10/2016	6/9/2016	7/11/2016	8/9/2016
Cargo Systems (Singe Aisle Programs)	6/1/2016	7/1/2016	8/2/2016	9/1/2016	10/1/2016	10/28/2016
Provision Kits (Single Aisle Programs)	2/1/2016	3/1/2016	4/1/2016	5/2/2016	6/1/2016	6/28/2016
Radomes (Single Aisle Programs)	5/16/2016	5/13/2016	7/15/2016	8/15/2016	9/14/2016	10/11/2016

	Preliminary On-Dock Dates Month of Delivery
Item	Feb 2017	Mar 2017	Apr 2017	May 2017	Jun 2017	Jul 2017
Seats	12/14/2016	1/23/2017	2/20/2017	3/23/2017	4/20/2017	5/22/2017
Galleys/Furnishings	12/7/2016	1/16/2017	2/13/2017	3/16/2017	4/13/2017	5/15/2017
Antennas & Mounting Equipment	10/14/2016	11/23/2016	12/20/2016	1/23/2017	2/20/2017	3/22/2017
Avionics	12/7/2016	1/16/2017	2/13/2017	3/16/2017	4/13/2017	5/15/2017
Cabin Systems Equipment	12/7/2016	1/16/2017	2/13/2017	3/16/2017	4/13/2017	5/15/2017
Miscellaneous Emergency Equipment	12/7/2016	1/16/2017	2/13/2017	3/16/2017	4/13/2017	5/15/2017
Textiles/Raw Material	8/30/2016	9/29/2016	10/27/2016	12/1/2016	1/9/2017	2/8/2017
Cargo Systems (Singe Aisle Programs)	11/23/2016	1/3/2017	1/30/2017	3/2/2017	3/30/3017	5/1/2017
Provision Kits (Single Aisle Programs)	7/22/2016	9/2/2016	9/30/2016	11/2/2016	11/30/2016	1/3/2017
Radomes (Single Aisle Programs)	12/14/2016	1/23/2017	1/13/2017	2/16/2017	3/13/2017	4/14/2017

	Preliminary On-Dock Dates Month of Delivery
Item	Aug 2017	Sep 2017	Oct 2017	Nov 2017	Dec 2017	Jan 2018
Seats	6/22/2017	6/22/2017	8/23/2017	9/21/2017	10/23/2017	11/13/17
Galleys/Furnishings	6/15/2017	6/15/2017	8/16/2017	9/14/2017	10/18/2017	11/06/17
Antennas & Mounting Equipment	4/21/2017	4/21/2017	6/23/2017	7/21/2017	8/23/2017	09/15/17
Avionics	6/15/2017	6/15/2017	8/16/2017	9/14/2017	10/18/2017	11/06/17
Cabin Systems Equipment	6/15/2017	6/15/2017	8/16/2017	9/14/2017	10/182017	11/06/17
Miscellaneous Emergency Equipment	6/15/2017	6/15/2017	8/16/2017	9/14/2017	10/18/2017	11/06/17

Attachment B to Exhibit E of PA 1810		SA-92
		Page 6
	BOEING PROPRIETARY

Textiles/Raw Material	3/10/2017	3/10/2017	5/10/2017	6/8/2017	7/11/2017	08/01/17
Cargo Systems (Singe Aisle Programs)	6/1/2017	6/1/2017	8/2/2017	8/31/2017	10/4/2017	10/23/17
Provision Kits (Single Aisle Programs)	2/1/2017	2/1/2017	4/3/2017	4/28/3017	6/5/2017	06/28/17
Radomes (Single Aisle Programs)	5/15/2017	5/15/2017	7/17/2017	8/14/2017	9/18/2017	10/06/17

	Preliminary On-Dock Dates Month of Delivery
Item	Feb-18	Mar-18	Apr-18	May-18	Jun-18
Seats	12/15/2017	1/22/2018	2/21/2018	3/22/2018	4/24/2018
Galleys/Furnishings	12/8/2017	1/15/2018	2/14/2018	3/15/2018	4/17/2018
Antennas & Mounting Equipment	10/17/2017	11/14/2017	12/18/2017	1/24/2018	2/26/2018
Avionics	12/8/2017	1/15/2018	2/14/2018	3/15/2018	4/17/2018
Cabin Systems Equipment	12/8/2017	1/15/2018	2/14/2018	3/15/2018	4/17/2018
Miscellaneous Emergency Equipment	12/8/2017	1/15/2018	2/14/2018	3/15/2018	4/17/2018
Textiles/Raw Material	8/31/2017	9/29/2017	10/31/2017	12/1/2017	1/11/2018
Cargo Systems (Singe Aisle Programs)	11/22/2017	12/22/2017	1/31/2018	3/1/2018	4/3/2018
Provision Kits (Single Aisle Programs)	7/31/2017	8/28/2017	9/28/2017	10/27/2017	12/1/2017
Radomes (Single Aisle Programs)	11/7/2017	12/7/2017	1/16/2018	2/14/2018	3/19/2018

3. Additional Delivery Requirements - Import.

Buyer will be the “importer of record” (as defined by the U.S. Customs and Border Protection) for all BFE imported into the United States, and as such, it has the responsibility to ensure all of Buyer’s BFE shipments comply with U.S. Customs Service regulations. In the event Buyer requests Boeing, in writing, to act as importer of record for Buyer’s BFE, and Boeing agrees to such request, Buyer is responsible for ensuring Boeing can comply with all U.S. Customs Import Regulations by making certain that, at the time of shipment, all BFE shipments comply with the requirements in the “International Shipment Routing Instructions”, including the Customs Trade Partnership Against Terrorism (C-TPAT), as set out on the Boeing website referenced below. Buyer agrees to include the International Shipment Routing Instructions, including C-TPAT requirements, in each contract between Buyer and BFE supplier.

http://www.boeing.com/companyoffices/doingbiz/supplier_portal/index_general.html

Attachment B to Exhibit E of PA 1810		SA-92
		Page 7
	BOEING PROPRIETARY

The Boeing Company

P.O. Box 3707

Seattle, WA 98124‑2207

SWA-PA-1810-LA-1001315R4

Southwest Airlines Co.

2707 Love Field Drive

P.O. Box 36611

Dallas, Texas 75235

Subject: ***

This Letter Agreement amends Purchase Agreement No. 1810 dated as of January 19, 1994 (the Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737-7H4 and 737-8H4 aircraft (Aircraft).

All terms used and not defined herein will have the same meaning as in the Agreement.

***

1. ***

2. ***

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P.A. No. 1810	SA-92

Southwest Airlines Co.

SWA-PA-1810-LA-1001315R4

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3. ***

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P.A. No. 1810	SA-92

Southwest Airlines Co.

SWA-PA-1810-LA-1001315R4

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4. ***

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P.A. No. 1810	SA-92

Southwest Airlines Co.

SWA-PA-1810-LA-1001315R4

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5. ***

6. Assignment.

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P.A. No. 1810	SA-92

Southwest Airlines Co.

SWA-PA-1810-LA-1001315R4

Page 5

Notwithstanding any other provisions of the Agreement, the rights and obligations described in this Letter Agreement, ***, have been provided to Buyer and cannot be assigned, in whole or in part.

5. Confidential Treatment

Buyer understands that certain commercial and financial information contained in this Letter Agreement is considered by Boeing as confidential and has value precisely because it is not available generally to other parties.  Buyer agrees to limit the disclosure of the contents of this Letter Agreement to (a) its directors and officers, (b) employees of Buyer with a need to know the contents for performing its obligations (including, without limitation, those employees performing accounting, finance, administration and other functions necessary to finance and purchase, deliver or lease the Aircraft) and who understand they are not to disclose its contents to any other person or entity (other than those to whom disclosure is permitted by this Section) without the prior written consent of Boeing and (c) any auditors and attorneys of Buyer who have a need to know such information and have signed a confidentiality agreement in the same form and substance similar to this Section, or are otherwise bound by a confidentiality obligation. Disclosure to other parties is not permitted without Boeing’s consent except as may be required by applicable law or governmental regulations. Buyer shall be fully responsible to Boeing for compliance with such obligations.

Very truly yours,

THE BOEING COMPANY
By	/s/ Jon W. Lewis
Its	Attorney-In-Fact
ACCEPTED AND AGREED TO this
Date:		December 21, 2015
SOUTHWEST AIRLINES CO.
By	/s/ Michael Van de Ven
Its	EVP & COO

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P.A. No. 1810	SA-92

Attachment A to SWA-PA-1810-LA1001315R4

Page 1 of 2

***

Letter Agmt SWA-PA-1810-LA-1001315R4; paragraph 3.3

No.	Model	Aircraft Block	MSN's	Current Delivery Mo.	Base Year	***
1	737-700	T-W-2b	36962	July-11	1999	***
2	737-700	T-W-2b	36963	July-11	1999	***
3	737-700	T-W-2b	36965	August-11	1999	***
4	737-700	T-W-2b	36967	October-11	1999	***
5	737-800	800LUV	36980	March-12	2011	***
6	737-800	800LUV	36983	April-12	2011	***
7	737-800	800LUV	36985	May-12	2011	***
8	737-800	800LUV	36987	May-12	2011	***
9	737-800	800LUV	36990	July-12	2011	***
10	737-800	800LUV	36992	August-12	2011	***
11	737-800	800LUV	36994	September-12	2011	***
12	737-800	800LUV	37003	November-12	2011	***
13	737-800	800LUV	37009	December-12	2011	***
14	737-800	800LUV	36973	March-13	2011	***
15	737-800	800LUV	36998	March-13	2011	***
16	737-800	800LUV	36908	April-13	2011	***
17	737-800	800LUV	36933	September-13	2011	***
18	737-800	800LUV	42526	November-13	2011	***
19	737-800	800LUV	37004	March-14	2011	***
20	737-800	800LUV	42521	May-14	2011	***
21	737-800	800LUV	42522	June-14	2011	***
22	737-800	800LUV	60082	June-14	2011	***
23	737-800	800LUV	60083	June-14	2011	***
24	737-800	800LUV	42523	June-14	2011	***
25	737-800	800LUV	60084	July-14	2011	***
26	737-800	800LUV	60085	July-14	2011	***
27	737-800	800LUV	60086	July-14	2011	***
28	737-800	800LUV	42524	December-14	2011	***
29	737-800	800LUV	42525	August-14	2011	***
30	737-800	800LUV	36935	August-14	2011	***
31	737-800	800LUV	42527	September-14	2011	***
32	737-800	800LUV	42528	August-14	2011	***
33	737-800	800LUV	42531	September-14	2011	***
34	737-800	800LUV	36909	September-14	2011	***
35	737-800	800LUV	42529	December-14	2011	***
36	737-800	800LUV	42530	December-14	2011	***
37	737-800	800LUV	37045	December-14	2011	***
38	737-800	800LUV	37037	December-14	2011	***
39	737-800	800LUV	42535	January-15	2011	***
40	737-800	800LUV	36940	November-15	2011	***
41	737-800	800LUV	36938	May-16	2011
42	737-800	800LUV	36939	May-16	2011
43	737-800	800LUV	36945	July-16	2011
44	737-800	800LUV	36977	September-16	2011
45	737-800	800LUV	42532	January-17	2011
46	737-800	800LUV	36910	January-17	2011
47	737-800	800LUV	36970	February-17	2011
48	737-800	800LUV	36969	February-17	2011

BOEING PROPRIETARY SA-92

Attachment A to SWA-PA-1810-LA1001315R4

Page 2 of 2

49	737-800	800LUV	36972	March-17	2011
50	737-800	800LUV	36927	April-17	2011
51	737-800	800LUV	36974	April-17	2011
52	737-800	800LUV	36925	May-17November-2016	2011	*
53	737-800	800LUV	36975	May-17December-2016	2011	*
54	737-800	800LUV	36976	Jun-2017December-2016	2011	*
55	737-800	800LUV	36926	January-18	2011
56	737-800	800LUV	42533	February-18	2011
57	737-800	800LUV	42545	February-18	2011
58	737-800	800LUV	42534	March-18	2011
59	737-800	800LUV	tbd	May-17	2011
60	737-800	800LUV	tbd	May-17	2011
61	737-800	800LUV	tbd	June-17	2011
62	737-800	800LUV	tbd	July-17	2011

*Accelerated in SA-92

BOEING PROPRIETARY SA-92

	The Boeing Company
	P.O. Box 3707
	Seattle, WA 98124‑2207

SWA-PA-1810-LA-1003490R4

Southwest Airlines Co.

2702 Love Field Drive

P.O. Box 36611

Dallas, Texas 75235

Subject: ***

Reference: Purchase Agreement No. 1810 (Purchase Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737-7H4 and 737-8H4 aircraft

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. Unless otherwise noted, this Letter Agreement is solely applicable to the Block 800LUV Aircraft identified in Tables 1b, 1c and 1d of the Purchase Agreement (Block 800LUV Aircraft). All terms used but not defined in this Letter Agreement shall have the same meaning as in the Purchase Agreement.

1.    ***

SWA-PA-1810-LA-1003490R4	Page 1
***	SA-92
BOEING PROPRIETARY

2.***

3.***

SWA-PA-1810-LA-1003490R4	Page 2
***	SA-92
BOEING PROPRIETARY

4.Assignment.

Unless otherwise noted herein, *** described in this Letter Agreement are provided *** in consideration of Buyer’s taking title to the Aircraft at time of delivery and becoming the operator of the Aircraft. This Letter Agreement cannot be assigned, in whole or in part, without the prior written consent of Boeing.

5.Confidentiality.

Buyer understands that certain commercial and financial information contained in this Letter Agreement including any attachments hereto is considered by Boeing as confidential. Buyer agrees that it will treat this Letter Agreement and the information contained herein as confidential and will not, without the prior written consent of Boeing, disclose this Letter Agreement or any information contained herein to any other person or entity except as provided in Letter Agreement No. 6-1162-RLL-934, as amended.

Very truly yours,

THE BOEING COMPANY
By	/s/ Jon W. Lewis
Its	Attorney-In-Fact
ACCEPTED AND AGREED TO this
Date:		December 21, 2015
SOUTHWEST AIRLINES CO.
By	/s/ Michael Van de Ven
Its	EVP & COO

SWA-PA-1810-LA-1003490R4	Page 3
***	SA-92
BOEING PROPRIETARY

	The Boeing Company
	P.O. Box 3707
	Seattle, WA 98124‑2207

SWA-PA-1810-LA-1105884R2

Southwest Airlines Co.

2702 Love Field Drive

P.O. Box 36611

Dallas, Texas 75235

Subject: Option Aircraft

This Letter Agreement amends Purchase Agreement No. 1810 dated as of January 19, 1994 (the Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737‑7H4 and 737-8H4 aircraft (Aircraft).

All terms used and not defined herein will have the same meaning as in the Agreement.

In consideration of the purchase by Buyer of the Aircraft, Boeing hereby agrees to manufacture and sell to Buyer and Buyer shall have the option to purchase (Option or Options) the additional Model 737-8H4 aircraft as described in paragraph 1 of Attachment A hereto and listed in Attachment B hereto (Option Aircraft).

1.    Delivery of Option Aircraft.

The Option Aircraft will be delivered to Buyer during or before the months set forth in Attachment B to this Letter Agreement.

2.    Price.

2.1    The advance payment base prices of the Option Aircraft are set forth in Attachment B to this Agreement. The Option Aircraft pricing elements and associated pricing terms and conditions are given in Attachment A to this Letter Agreement.

2.2    The Advance Payment Base Prices of the Option Aircraft identified in Attachment B to this Letter Agreement do include an amount for special features in addition to those specifically described in Attachment A but do not include any amount for items of Buyer Furnished Equipment (BFE). An estimate for typical special features per Option Aircraft (expressed in 2011 STE dollars) is listed in Attachment B. Attachment B to this Letter Agreement lists the Advance Payment Base Price per Option Aircraft.

2.3    The Option Aircraft purchase price will be the applicable basic price thereof at the time of Option Aircraft delivery adjusted in accordance with Boeing's Aircraft escalation provisions contained in the definitive agreement to purchase the Option Aircraft. The purchase price will include the price for Seller Purchased Equipment (SPE) if Buyer has elected to change BFE to SPE.

Page 1

SA-92

BOEING PROPRIETARY

3.    Option Aircraft Payment.

3.1    In consideration of the granting of the Options as set forth herein, on the date of execution of this Letter Agreement, Buyer will pay a deposit to Boeing of *** for each Option Aircraft (Deposit). In the event Buyer exercises its Options herein, the amount of the Deposit will be credited against the first advance payment due for such Option Aircraft pursuant to the advance payment schedule set forth in the definitive agreement for such Option Aircraft. In the event that Buyer does not exercise its Options to purchase the Option Aircraft pursuant to the terms and conditions set forth herein, Boeing will be entitled to retain the Deposits for the Option Aircraft except as provided in paragraph 4 herein.

3.2    Unless otherwise agreed by the parties, advance payments in the amount of *** of the advance payment base price will be payable on the Option Aircraft in accordance with Attachment B of this Letter Agreement. The remainder of the Option Aircraft purchase price is due at the time of delivery of the Option Aircraft.

4.    Option Exercise.

4.1    To exercise its Option, Buyer will give written or telegraphic notice thereof to Boeing on or before eighteen (18) months prior to the first day of the delivery month of each Option Aircraft.

4.2    It is understood and agreed that Boeing may accelerate the Option exercise dates specified above if Boeing must make production decisions which are dependent on Buyer's decision to buy the Option Aircraft. If Boeing elects to accelerate the Option exercise dates, Boeing will do so by giving written or telegraphic notice thereof to Buyer. Such notice will specify the revised Option exercise dates, which will not be earlier than 30 days after the date of transmittal of such notice, and the Option Aircraft delivery positions affected by such revision. If Buyer fails to exercise its Option for any Option Aircraft affected by such revised dates, the Deposit applicable to such Option Aircraft will be promptly refunded, with interest, to Buyer. The interest rate for calculation of the interest associated with such refund is the rate of two percent (2%) below the Citibank base rate in effect from time to time during the period the Option deposit is held by Boeing.

5.    Contract Terms.

5.1    It is understood that Boeing and Buyer will use their best efforts to enter into a definitive agreement for the Option Aircraft within thirty (30) days after Buyer exercises an Option to purchase Option Aircraft pursuant to paragraph 4 covering the detailed terms and conditions for the sale of such Option Aircraft.

5.2    Such definitive agreement will include the terms and conditions contained herein together with the terms and conditions, not inconsistent herewith, contained in Boeing's then‑current standard form of purchase agreement for the sale of Model 737‑800 aircraft in effect as of the date of Option exercise and such additional terms and conditions as may be mutually agreed upon. In the event the parties have not entered into such an agreement within the time period contemplated herein, either party

SWA-PA-1810-LA-1105884R2	Page 2
Option Aircraft	SA-92
BOEING PROPRIETARY

may, exercisable by written or telegraphic notice given to the other within thirty (30) days after such period, terminate the purchase of such Option Aircraft.

6.    Termination of Option to Purchase.

6.1    Either Boeing or Buyer may terminate the Options to purchase an Option Aircraft if any of the following events are not accomplished by the respective dates contemplated in this letter agreement, or in the Agreement, as the case may be:

(i)    termination of the purchase of the Aircraft under the Agreement for any reason;

(ii)    payment by Buyer of the Deposit with respect to an Option Aircraft pursuant to paragraph 3.1 herein;

(iii)    exercise of an Option to purchase an Option Aircraft pursuant to the terms hereof.

6.2    Any termination of an Option to purchase by Boeing which is based on the termination of the purchase of Aircraft under the Agreement will be on a one-for-one basis, for each Aircraft so terminated.

6.3    Any cancellation of an Option to purchase which is based on failure to make the required Deposit or to exercise the Option to purchase shall only apply to the Option Aircraft so canceled.

6.4    Termination of an Option to purchase provided by this letter agreement will be caused by either party giving written notice to the other within 10 days after the applicable date. Upon receipt of such notice, all rights and obligations of the parties with respect to an Option Aircraft for which the Option to purchase has been terminate will thereupon terminate.

6.5    ***

7.    Confidential Treatment.

Buyer understands that certain commercial and financial information contained in this Letter Agreement including any attachments hereto is considered by Boeing as confidential. Buyer agrees that it will treat this Letter Agreement and the information contained herein as confidential and will not, without the prior written consent of Boeing, disclose this Letter Agreement or any information contained herein to any other person or entity except as provided in Letter Agreement No. 6‑1162‑RLL‑934, as amended.

SWA-PA-1810-LA-1105884R2	Page 3
Option Aircraft	SA-92
BOEING PROPRIETARY

Very truly yours,

THE BOEING COMPANY
By	/s/ Jon W. Lewis
Its	Attorney-In-Fact
ACCEPTED AND AGREED TO this
Date:		December 21, 2015
SOUTHWEST AIRLINES CO.
By	/s/ Michael Van de Ven
Its	EVP & COO

Attachments

SWA-PA-1810-LA-1105884R2	Page 4
Option Aircraft	SA-92
BOEING PROPRIETARY

Attachment A to

SWA-PA-1810-LA-1105884R2

Page 1

Model 737‑8H4 Aircraft

1.    Option Aircraft Description and Changes.

1.1    Aircraft Description. The Option Aircraft is described by Boeing Detail Specification D019A001SWA38P-1 Rev F, Dated September 9, 2015.

1.2    Changes. The Detail Specification will be revised to include:

(1)    Changes applicable to the basic Model 737‑800 aircraft which are developed by Boeing between the date of the Detail Specification and the signing of a definitive agreement to purchase the Option Aircraft.

(2)    Changes mutually agreed upon.

(3)    Changes required to obtain a Standard Certificate of Airworthiness.

(4)    To provide sufficient Option Aircraft manufacturing and procurement lead time it is necessary for Boeing and Buyer to reach final agreement on the Option Aircraft configuration, including BFE/SPE vendor selection fifteen (15) months prior to delivery of each Option Aircraft. If such items are not resolved by the indicated dates, Boeing reserves the right to amend this letter agreement:

(i)    to adjust the scheduled delivery of the Option Aircraft to a later time period and,

(ii)    to make such other changes as are appropriate and consistent with the revised Option Aircraft deliveries.

1.3    Effect of Changes. Changes to the Detail Specification incorporated pursuant to the provisions of the clauses above will include the effects of such changes upon Option Aircraft weight, balance, design and performance. Performance guarantees for the Option Aircraft which are mutually acceptable to the parties will be included in the definitive agreement for the Option Aircraft.

2.    Price Description.

2.1    Price Elements Per Aircraft. The Aircraft Basic Price detailed in Attachment B to this Letter Agreement is added to the estimated Ecomomic Price Adjustment to determine the Advance Payment Base Price of the Option Aircraft (also listed in Attachment B of this Letter Agreement).

2.2    ***

P.A. No. 1810 SA-92

Attachment A to

SWA-PA-1810-LA-1105884R2

Page 2

P.A. No. 1810 SA-92

Attachment B To

Letter Agreement SWA-PA-1810-LA-1105884R2

Option Aircraft Delivery, Description, Price and Advance Payments

Airframe Model/MTOW: 737-800 174,200 pounds Detail Specification: D019A001SWA38 (1/9/2015)

Engine Model/Thrust: CFM56-7B27 27,300 pounds Airframe Price Base Year/Escalation Formula: Jul-11 ECI-MFG/CPI

Airframe Price: *** Engine Price Base Year/Escalation Formula: N/A N/A

Optional Features Estimate: ***

Sub-Total of Airframe and Features: *** Airframe Escalation Data:

Engine Price (Per Aircraft): *** Base Year Index (ECI): ***

Aircraft Basic Price (Excluding BFE/SPE): *** Base Year Index (CPI): ***

Buyer Furnished Equipment (BFE) Estimate: ***

Seller Purchased Equipment (SPE) Estimate: ***

Deposit per Aircraft: ***

Delivery Date	Number of Aircraft	Escalation Factor (Airframe)	Escalation Estimate Adv Payment Base Price Per A/P	Advance Payment Per Aircraft (Amts. Due/Mos. Prior to Delivery):
				At Signing ***	24 Mos. ***	21/18/12/9/6 Mos. ***	Total ***
Jan-2018	1	***	***	***	***	***	***
Feb-2018	2	***	***	***	***	***	***
Mar-2018	1	***	***	***	***	***	***
Apr-2018	1	***	***	***	***	***	***
May-2018	2	***	***	***	***	***	***
Jun-2018	2	***	***	***	***	***	***
Jul-2018	2	***	***	***	***	***	***
Aug-2018	3	***	***	***	***	***	***
Sep-2018	1	***	***	***	***	***	***
Oct-2018	1	***	***	***	***	***	***
Nov-2018	1	***	***	***	***	***	***
Dec-2018	1	***	***	***	***	***	***
Total:	18

		SA-92
SWA-PA-01810 82233-1F.TXT	BOEING PROPRIETARY	Page 1

	The Boeing Company
	P.O. Box 3707
	Seattle, WA 98124‑2207

Southwest Airlines Co.

2702 Love Field Drive

P.O. Box 36611

Dallas, Texas 75235

Subject: ***

Reference: Purchase Agreement No. 1810 (Purchase Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737-7H4 and 737-8H4 aircraft

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. Unless otherwise noted, this Letter Agreement is solely applicable to the Block 800LUV Aircraft identified in Tables 1b, 1c and 1d to the Purchase Agreement (Firm Aircraft), and the Option Aircraft identified in the Attachment to Letter Agreement No. SWA-PA-1810-LA-1105884R2 to the Purchase Agreement (Option Aircraft). All terms used but not defined in this Letter Agreement shall have the same meaning as in the Purchase Agreement.

1.    ***

2.    ***

P.A. No. 1810	SA-92
SWA-PA-1810-LA-1105886R2	Page 1
BOEING PROPRIETARY

3.    Confidentiality.

Buyer understands that certain commercial and financial information contained in this Letter Agreement is considered by Boeing as confidential and has value precisely because it is not available generally to other parties.  Buyer agrees to limit the disclosure of the contents of this Letter Agreement to (a) its directors and officers, (b) employees of Buyer with a need to know the contents for performing its obligations (including, without limitation, those employees performing accounting, finance, administration and other functions necessary to finance and purchase, deliver or lease the Aircraft) and who understand they are not to disclose its contents to any other person or entity (other than those to whom disclosure is permitted by this Article) without the prior written consent of Boeing and (c) any auditors and attorneys of Buyer who have a need to know such information and have signed a confidentiality agreement in the same form and substance similar to this Article, or are otherwise bound by a confidentiality obligation. Disclosure to other parties is not permitted without Boeing’s consent except as may be required by applicable law or governmental regulations. Buyer shall be fully responsible to Boeing for compliance with such obligations.

4.    Assignment.

Notwithstanding any other provisions of the Purchase Agreement, the rights and obligations described in this Letter Agreement are provided to Buyer in consideration of Buyer’s becoming the operator of the Aircraft and cannot be assigned in whole or, in part.

[Signature page follows.]

[Remainder of page intentionally left blank.]

P.A. No. 1810	SA-92
SWA-PA-1810-LA-1105886R2	Page 2
BOEING PROPRIETARY

Very truly yours,

THE BOEING COMPANY
By	/s/ Jon W. Lewis
Its	Attorney-In-Fact
ACCEPTED AND AGREED TO this
Date:		December 21, 2015
SOUTHWEST AIRLINES CO.
By	/s/ Michael Van de Ven
Its	EVP & COO

P.A. No. 1810	SA-92
SWA-PA-1810-LA-1105886R2	Page 3
BOEING PROPRIETARY

	The Boeing Company
	P.O. Box 3707
	Seattle, WA 98124‑2207

SWA-PA-1810-LA-1105888R5

Southwest Airlines Co.

2702 Love Field Drive

P.O. Box 36611

Dallas, Texas 75235

Subject: ***

Reference: Purchase Agreement No. 1810 (Purchase Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737-7H4 and 737-8H4 aircraft

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. All terms used but not defined in this Letter Agreement shall have the same meaning as in the Purchase Agreement.

***

1.    ***

SWA-PA-1810-LA-1105888R5	Page 1
***	SA-92
BOEING PROPRIETARY

2.    Termination of Agreements relating to Large Area Display System. Boeing and Buyer hereby terminate all agreements relating to the installation of large area display systems on Buyer’s 737-300/-500 aircraft in Buyer’s fleet (LADS Project). *** Boeing and Buyer hereby agree that neither party shall have any further obligations with respect to the LADS Project.

3.    ***

SWA-PA-1810-LA-1105888R5	Page 2
***	SA-92
BOEING PROPRIETARY

*** Aircraft by MSN
36717	33943
34861	33925
33923	36724
36718	33917
33929	34479
36399	34862
33927	35110
33928	33918
35109	33930
35788	33931
36091	33921
33926	33922
33919	36725
33934	33933
33924	36716

4.    Assignment.

The business terms described in this Letter Agreement are provided *** in consideration of Buyer’s taking title to the Firm Aircraft and Option Aircraft at time of delivery and becoming the operator of the Firm Aircraft and Option Aircraft. Under no circumstances will Buyer be permitted to assign the business terms set forth herein.

5.    Confidentiality

Buyer understands that certain commercial and financial information contained in this Letter Agreement is considered by Boeing as confidential and has value precisely because it is not available generally to other parties.  Buyer agrees to limit the disclosure of the contents of this Letter Agreement to (a) its directors and officers, (b) employees of Buyer with a need to know the contents for performing its obligations (including, without limitation, those employees performing accounting, finance, administration and other functions necessary to finance and purchase, deliver or lease the Aircraft) and who understand they are not to disclose its contents to any other person or entity (other than those to whom disclosure is permitted by this paragraph) without the prior written consent of Boeing and (c) any auditors and attorneys of Buyer who have a need to know such information and have signed a confidentiality agreement in the same form and substance similar to this paragraph, or are

otherwise bound by a

SWA-PA-1810-LA-1105888R5	Page 3
***	SA-92
BOEING PROPRIETARY

confidentiality obligation. Disclosure to other parties is not permitted without Boeing’s consent except as may be required by applicable law or governmental regulations. Buyer shall be fully responsible to Boeing for compliance with such obligations.

Very truly yours,

THE BOEING COMPANY
By	/s/ Jon W. Lewis
Its	Attorney-In-Fact
ACCEPTED AND AGREED TO this
Date:		December 21, 2015
SOUTHWEST AIRLINES CO.
By	/s/ Michael Van de Ven
Its	EVP & COO

SWA-PA-1810-LA-1105888R5	Page 4
***	SA-92
BOEING PROPRIETARY

	The Boeing Company
	P.O. Box 3707
	Seattle, WA 98124‑2207

SWA-PA-1810-LA-1303010R1

Southwest Airlines Co.

2702 Love Field Drive

P.O. Box 36611

Dallas, Texas 75235-1611

Subject: ***

Reference: (a)    Purchase Agreement No. PA-1810 (Purchase Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737-7H4 and 737-8H4 aircraft (Aircraft)

(b)    Letter Agreement SWA-PA-1810-LA-1003490R4, ***

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. All terms used but not defined in this Letter Agreement shall have the same meaning as in the Purchase Agreement.

***

1.    ***

SWA-PA-1810-LA-1303010R1	SA-92
***	LA Page 1
BOEING PROPRIETARY

2.    Assignment.

The business terms described in this Letter Agreement are provided *** and in consideration of Buyer’s taking title to the Aircraft at time of delivery and becoming the operator of the Aircraft. Under no circumstances will Buyer be permitted to assign the business terms set forth herein.

3.    Confidentiality.

Buyer understands that certain commercial and financial information contained in this Letter Agreement including any attachments hereto is considered by Boeing as confidential. Buyer agrees that it will treat this Letter Agreement and the information contained herein as confidential and will not, without the prior written consent of Boeing, disclose this Letter Agreement or any information contained herein to any other person or entity except as provided in Letter Agreement No. 6-1162-RLL-934, as amended.

SWA-PA-1810-LA-1303010R1	SA-92
***	LA Page 2
BOEING PROPRIETARY

Very truly yours,

THE BOEING COMPANY
By	/s/ Jon W. Lewis
Its	Attorney-In-Fact
ACCEPTED AND AGREED TO this
Date:		December 21, 2015
Southwest Airlines Co.
By	/s/ Michael Van de Ven
Its	EVP & COO

SWA-PA-1810-LA-1303010R1	SA-92
***	LA Page 3
BOEING PROPRIETARY

	The Boeing Company
	P.O. Box 3707
	Seattle, WA 98124‑2207

SWA-PA-1810-LA-1504814

Southwest Airlines Co.

2702 Love Field Drive

P.O. Box 36611

Dallas, Texas 75235

Subject: ***

Reference: Purchase Agreement No. PA-1810 (Purchase Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Buyer) relating to Model 737-7H4 and 737-8H4 aircraft (Aircraft)

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. All terms used but not defined in this Letter Agreement shall have the same meaning as in the Purchase Agreement.

***

1.    ***

	Page 1
	SA-92
BOEING PROPRIETARY

2.    Assignment.

The business terms described in this Letter Agreement are provided *** in consideration of Buyer’s taking title to the Firm Aircraft and Option Aircraft at time of delivery and becoming the operator of the Firm Aircraft and Option Aircraft. Under no circumstances will Buyer be permitted to assign the business terms set forth herein.

3.    Confidentiality

Buyer understands that certain commercial and financial information contained in this Letter Agreement is considered by Boeing as confidential and has value precisely because it is not available generally to other parties. Buyer agrees to limit the disclosure of the contents of this Letter Agreement to (a) its directors and officers, (b) employees of Buyer with a need to know the contents for performing its obligations (including, without limitation, those employees performing accounting, finance, administration and other functions necessary to finance and purchase, deliver or lease the Aircraft) and who understand they are not to disclose its contents to any other person or entity (other than those to whom disclosure is permitted by this paragraph) without the prior written consent of Boeing and (c) any auditors and attorneys of Buyer who have a need to know such information and have signed a confidentiality agreement in the same form and substance similar to this paragraph, or are otherwise bound by a confidentiality obligation. Disclosure to other parties is not permitted without Boeing’s consent except as may be required by applicable law or governmental regulations. Buyer shall be fully responsible to Boeing for compliance with such obligations

Very truly yours,

THE BOEING COMPANY
By	/s/ Jon W. Lewis
Its	Attorney-In-Fact
ACCEPTED AND AGREED TO this
Date:		December 21, 2015
SOUTHWEST AIRLINES CO.
By	/s/ Michael Van de Ven
Its	EVP & COO

SWA-PA-1810-LA-1504814		Page 2
***		SA-92
	BOEING PROPRIETARY

EX-10.18 (A)

SUPPLEMENTAL AGREEMENT NO. 4

to

Purchase Agreement No. 3729

between

THE BOEING COMPANY

and

SOUTHWEST AIRLINES CO.

Relating to Boeing Model 737-8 and 737-7 Aircraft

THIS SUPPLEMENTAL AGREEMENT No. 4 (SA-4), entered into as of December 21, 2015, is made between THE BOEING COMPANY, a Delaware corporation (Boeing), and SOUTHWEST AIRLINES CO., a Texas corporation (Customer).

RECITALS:

WHEREAS, Customer and Boeing entered into Purchase Agreement Number PA-03729 dated December 13, 2011, as amended and supplemented, (Purchase Agreement) relating to the purchase and sale of Boeing Mode 737-8 (737-8 Aircraft) and Model 737-7 aircraft (737-7 Aircraft); collectively the “Aircraft”. This Supplemental Agreement No. 4 is an amendment to and is incorporated into the Purchase Agreement. Capitalized terms used herein but not otherwise defined shall have the meaning set forth in the Purchase Agreement.

WHEREAS, Boeing has agreed to modify certain business considerations applicable to the firm Block A Aircraft, Block B Aircraft and Block C Aircraft identified in Table 1A of the Purchase Agreement.

WHEREAS, the parties desire to amend the Purchase Agreement as hereinafter set forth to make certain other changes;

NOW, THEREFORE, the parties agree that the Purchase Agreement is amended as set forth below and otherwise agree as follows:

***Pursuant to 17 CFR 240.24b-2, confidential information has been omitted and has been filed separately with the Securities and Exchange Commission pursuant to a Confidential Treatment Application filed with the Commission.

SWA-PA-03729	1	SA-4
BOEING PROPRIETARY

1. TABLE OF CONTENTS.

The Table of Contents of the Purchase Agreement is deleted in its entirety and replaced with a new Table of Contents (attached), which lists Exhibits and Letter Agreements revised by this Supplemental Agreement No. 4 and identified by “SA-4”. Such revised Table of Contents is incorporated into the Purchase Agreement by this reference.

2. Letter Agreements.

2.1    Letter Agreement SWA-PA-03729-LA-1106472R1, ***, no longer applies, is deleted in its entirety and removed from the Purchase Agreement.

2.2    Letter Agreement SWA-PA-03729-LA-1301168, ***, is deleted in its entirety and replaced with the attached revised Letter Agreement SWA-PA-03729-LA-1301168R1, ***.

2.3    Letter Agreement SWA-PA-01810/03729-LA-1301169, ***, no longer applies, is deleted in its entirety and removed from the Purchase Agreement.

The Purchase Agreement is deemed to be supplemented to the extent herein provided and as so supplemented will continue in full force and effect.

EXECUTED IN DUPLICATE as of the day and year first above written.

THE BOEING COMPANY	SOUTHWEST AIRLINES CO.
By: /s/ Jon W. Lewis	By: /s/ Michael Van de Ven
Its: Attorney-In-Fact	Its: EVP & COO

SWA-PA-03729	2	SA-4
BOEING PROPRIETARY

PURCHASE AGREEMENT NUMBER PA-03729

between

THE BOEING COMPANY

and

Southwest Airlines Co.

Relating to Boeing Model 737-8 and 737-7 Aircraft

SWA-PA-03729 ***		SA-4
	BOEING PROPRIETARY	Page 1

TABLE OF CONTENTS
ARTICLES	TITLES
Article 1	Quantity, Model and Description	SA-2
Article 2	Delivery Schedule
Article 3	Price
Article 4	Payment	SA-2
Article 5	Additional Terms
TABLE	TITLE
1A	737-8 Aircraft Information Table	SA-3
1B	737-7 Aircraft Information Table	SA-2
EXHIBIT
A1	737-8 Aircraft Configuration	SA-2
A2	737-7 Aircraft Configuration	SA-2
B*	Aircraft Delivery Requirements and Responsibilities
SUPPLEMENTAL EXHIBITS	TITLES
AE1*	Escalation Adjustment/Airframe and Optional Features
BFE1*	BFE Variables
CS1	Customer Support Variables
CS1-7MAX	Customer Support Variables	SA-2
EE1*	Engine Escalation/Engine Warranty and Patent Indemnity
SLP1*	Service Life Policy Components
LETTER AGREEMENTS	TITLES
SWA-PA-03729-LA-1106463R1	Open Matters	SA-2
SWA-PA-03729-LA-1106464*	***

SWA-PA-03729	SA-4
	Page 2
BOEING PROPRIETARY

LETTER AGREEMENTS	TITLES
SWA-PA-03729-LA-1106465*	***
SWA-PA-03729-LA-1106466	***
SWA-PA-03729-LA-1106467	***
SWA-PA-03729-LA-1106468*	***
SWA-PA-03729-LA-1106469R1	***	SA-2
SWA-PA-03729-LA-1106470R1	***	SA-2
SWA-PA-03729-LA-1106471R1	Substitute Aircraft	SA-2
SWA-PA-03729-LA-1106473	***
SWA-PA-03729-LA-1106474	Option Aircraft
	Attachment 1	SA-3
SWA-PA-03729-LA-1106475	***
SWA-PA-03729-LA-1106476*	***
SWA-PA-03729-LA-1106477*	***
SWA-PA-03729-LA-1106478	***
SWA-PA-03729-LA-1106479R1	***	SA-2
SWA-PA-03729-LA-1106480R1	***	SA-2
SWA-PA-03729-LA-1106481R2	***	SA-2
SWA-PA-03729-LA-1106482*	***
SWA-PA-03729-LA-1106483*	***
SWA-PA-03729-LA-1106484*	***
	Attachment A	SA-2
	Attachment B	SA-2
SWA-PA-03729-LA-1106485*	***
SWA-PA-03729-LA-1209080	***	SA-1
SWA-PA-03729-LA-1210419	***	SA-1

SWA-PA-03729	SA-4
	Page 3
BOEING PROPRIETARY

LETTER AGREEMENTS	TITLES
SWA-PA-03729-LA-1300943	***	SA-2
SWA-PA-03729-LA-1301168R2	***	SA-4
SWA-PA-03729-LA-1301170	***	SA-2
* Denotes revision to Page 1 or Page 2 only to reference 737-7 (SA-2)

SWA-PA-03729	SA-4
	Page 4
BOEING PROPRIETARY

INACTIVE / DELETED TABLES, EXHIBITS, AND LETTER AGREEMENTS

RESTRICTED LETTER AGREEMENTS

Letter Agreement	Title	Last Updated under SA	Current Status
SWA-PA-03729-LA-1106472R1	***	SA-2	Deleted under SA-4
SWA-PA-01810/03729-LA-1301169	***	SA-2	Deleted under SA-4

SWA-PA-03729	SA-4
	Page 5
BOEING PROPRIETARY

	The Boeing Company
	P.O. Box 3707
	Seattle, WA 98124‑2207

SWA-PA-03729-LA-1301168R2

Southwest Airlines Co.

2702 Love Field Drive

P.O. Box 36611

Dallas, Texas 75235

Subject: ***

Reference: Purchase Agreement No. 3729 (Purchase Agreement) between The Boeing Company (Boeing) and Southwest Airlines Co. (Customer) relating to Model 737-7 and 737-8 aircraft

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. All terms used but not defined in this Letter Agreement shall have the same meaning as in the Purchase Agreement.

***

1. ***

SA-4

Page 1

BOEING PROPRIETARY

SWA-PA-03729-LA-1301168R2	SA-4
***	Page 2
BOEING PROPRIETARY

2.Assignment.

*** described in this Letter Agreement are provided *** in consideration of Customer’s taking title to the applicable Firm Aircraft at time of delivery and becoming the operator of the applicable Firm Aircraft. Under no circumstances will Customer be permitted to assign the business terms set forth herein.

3.Confidentiality.

Customer understands that certain commercial and financial information contained in this Letter Agreement is considered by Boeing as confidential and has value precisely because it is not available generally to other parties.  Customer agrees to limit the disclosure of the contents of this Letter Agreement to (a) its directors and officers, (b) employees of Customer with a need to know the contents for performing its obligations (including, without limitation, those employees performing accounting, finance, administration and other functions necessary to finance and purchase, deliver or lease the Aircraft) and who understand they are not to disclose its contents to any other person or entity (other than those to whom disclosure is permitted by this paragraph) without the prior written consent of Boeing and (c) any auditors and attorneys of Customer who have a need to know such information and have signed a confidentiality agreement in the same form and substance similar to this paragraph, or are otherwise bound by a confidentiality obligation. Disclosure to other parties is not permitted without Boeing’s consent except as may be required by applicable law or governmental regulations. Customer shall be fully responsible to Boeing for compliance with such obligations.

Very truly yours,

THE BOEING COMPANY
By	/s/ Jon W. Lewis
Its	Attorney-In-Fact
ACCEPTED AND AGREED TO this
Date:		December 21, 2015
SOUTHWEST AIRLINES CO.
By	/s/ Michael Van de Ven
Its	EVP & COO

SWA-PA-03729-LA-1301168R2	SA-4
***	Page 3
BOEING PROPRIETARY

EX-21

Exhibit 21

Southwest Airlines Co.

Subsidiaries

Name	State or Other Jurisdiction of Incorporation or Organization
AirTran Airways 717 Leasing Corporation	Delaware
AirTran Airways, Inc.	Delaware
AirTran Holdings, LLC	Texas
AirTran Risk Management, Inc.	Delaware
Southwest Jet Fuel Co.	Texas
Triple Crown Insurance Co., Ltd.	Bermuda

EX-23

Exhibit 23

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements (Form S-8, Nos. 33-20275, 33-57327, 33-40652, 33-40653, 333-64431, 333-67627, 333-67631, 333-82735, 333-89303, 333-52388, 333-52390, 333-53610, 333-53616, 333-57478, 333-46560, 333-98761, 333-100862, 333-104245, 333-117802, 333-139362, 333-146891, 333-160762, 333-166980, 333-190268, 333-205979, Form S-3 Nos. 333-158397, 333-180969, 333-203761 and Form S-4 No. 333-170742) of Southwest Airlines Co. and in the related Prospectuses of our reports dated February 2, 2016, with respect to the consolidated financial statements of Southwest Airlines Co., and the effectiveness of internal control over financial reporting of Southwest Airlines Co., included in this Annual Report (Form 10-K) for the year ended December 31, 2015.

/s/ Enst & Young LLP

Dallas, Texas

February 2, 2016

EX-31.1

   Exhibit 31.1

CERTIFICATION

I, Gary C. Kelly, Chairman of the Board, President, & Chief Executive Officer of Southwest Airlines Co., certify that:

1.           I have reviewed this annual report on Form 10-K/A for the year ended December 31, 2015 of Southwest Airlines Co.;

2.           Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.           Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.           The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

 (a)           designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)           designed such internal control over financial reporting, or caused such internal control over financial reporting to be

designed under our supervision, 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;

(c)           evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)           disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.           The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)           all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)           any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:  February 2, 2016

By:	/s/ Gary C. Kelly
	Gary C. Kelly
	Chairman of the Board, President, & Chief Executive Officer

EX-31.2

   Exhibit 31.2

CERTIFICATION

I, Tammy Romo, Senior Vice President Finance & Chief Financial Officer of Southwest Airlines Co., certify that:

1.           I have reviewed this annual report on Form 10-K for the year ended December 31, 2015, of Southwest Airlines Co.;

2.           Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.           Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.           The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

 (a)           designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)           designed such internal control over financial reporting, or caused such internal control over financial reporting to be

designed under our supervision, 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;

(c)           evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)           disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.           The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)           all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)           any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 2, 2016

By:	/s/ Tammy Romo
	Tammy Romo
	Executive Vice President Finance & Chief Financial Officer

EX-32

Exhibit 32
 

 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, 

AS ADOPTED PURSUANT TO 

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 
 

In connection with the Annual Report on Form 10-K of Southwest Airlines Co. (the “Company”) for the period ended December 31, 2015, as filed with the Securities and Exchange Commission (the “Report”), Gary C. Kelly, Chairman of the Board, President, & Chief Executive Officer of the Company, and Tammy Romo, Senior Vice President Finance & Chief Financial Officer of the Company, each certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and 

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. 

Date:  February 2, 2016

By:	/s/ Gary C. Kelly
	Gary C. Kelly
	Chairman of the Board, President, & Chief Executive Officer

By:	/s/ Tammy Romo
	Tammy Romo
	Executive Vice President Finance & Chief Financial Officer

XML

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Jan. 29, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	SOUTHWEST AIRLINES CO
Entity Central Index Key	0000092380
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		638,070,032
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 21,774,060,585

XML

Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 1,583	$ 1,282
Short-term investments	1,468	1,706
Accounts and other receivables	474	365
Inventories of parts and supplies, at cost	311	342
Prepaid expenses and other current assets	188	232
Total current assets	4,024	3,927
Property and equipment, at cost:
Flight equipment	19,462	18,473
Ground property and equipment	3,219	2,853
Deposits on flight equipment purchase contracts	1,089	566
Assets constructed for others	915	621
Property and equipment, at cost	24,685	22,513
Less allowance for depreciation and amortization	9,084	8,221
Property and equipment, net	15,601	14,292
Goodwill	970	970
Other assets	717	534
Total assets	21,312	19,723
Current liabilities:
Accounts payable	1,188	1,203
Accrued liabilities	2,591	1,565
Air traffic liability	2,990	2,897
Current maturities of long-term debt	637	258
Total current liabilities	7,406	5,923
Long-term debt less current maturities	2,541	2,434
Deferred income taxes	2,490	2,782
Construction obligation	757	554
Other noncurrent liabilities	760	1,255
Stockholders' equity:
Common stock, $1.00 par value: 2,000,000,000 shares authorized; 807,611,634 shares issued in 2015 and 2014	808	808
Capital in excess of par value	1,374	1,315
Retained earnings	9,409	7,416
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,051)	(738)
Treasury stock, at cost: 160,010,017 and 132,017,550 shares in 2015 and 2014 respectively	(3,182)	(2,026)
Total stockholders' equity	7,358	6,775
Total liabilities and stockholders' equity	$ 21,312	$ 19,723

XML

Consolidated Balance Sheet (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, shares issued (in shares)	807,611,634	807,611,634
Treasury stock, at cost: shares (in shares)	160,010,017	132,071,550

XML

Consolidated Statement of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING REVENUES:
Passenger	$ 18,299	$ 17,658	$ 16,721
Freight	179	175	164
Special revenue adjustment	172	0	0
Other	1,170	772	814
Total operating revenues	19,820	18,605	17,699
OPERATING EXPENSES:
Salaries, wages, and benefits	6,383	5,434	5,035
Fuel and oil	3,616	5,293	5,763
Maintenance materials and repairs	1,005	978	1,080
Aircraft rentals	238	295	361
Landing fees and other rentals	1,166	1,111	1,103
Depreciation and amortization	1,015	938	867
Acquisition and integration	39	126	86
Other operating expenses	2,242	2,205	2,126
Total operating expenses	15,704	16,380	16,421
OPERATING INCOME	4,116	2,225	1,278
OTHER EXPENSES (INCOME):
Interest expense	121	130	131
Interest Costs Capitalized Adjustment	(31)	(23)	(24)
Interest income	(9)	(7)	(6)
Other (gains) losses, net	556	309	(32)
Total other expenses (income)	637	409	69
INCOME BEFORE INCOME TAXES	3,479	1,816	1,209
PROVISION FOR INCOME TAXES	1,298	680	455
NET INCOME	$ 2,181	$ 1,136	$ 754
NET INCOME PER SHARE, BASIC (in dollars per share)	$ 3.30	$ 1.65	$ 1.06
NET INCOME PER SHARE, DILUTED (in dollars per share)	3.27	1.64	1.05
Cash dividends declared per common share (in dollars per share)	$ 0.2850	$ 0.2200	$ 0.1300

XML

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 2,181	$ 1,136	$ 754
Unrealized gain (loss) on defined benefit plan items, net of deferred taxes of ($7), ($8), and $15	(12)	(16)	24
Other, net of deferred taxes of $-, $-, and $7	(2)	0	9
OTHER COMPREHENSIVE INCOME (LOSS)	(313)	(735)	116
COMPREHENSIVE INCOME	1,868	401	870
Fuel derivatives
Unrealized gain (loss) on derivatives, net of tax	(308)	(727)	52
Interest rate derivatives
Unrealized gain (loss) on derivatives, net of tax	$ 9	$ 8	$ 31

XML

Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred taxes on unrealized gain (loss), other, tax effect	$ 0	$ 0	$ 7
Deferred taxes on postretirement	(7)	(8)	15
Fuel derivatives
Deferred taxes on unrealized gain (loss) on derivatives, tax effect	(181)	(430)	31
Interest rate derivatives
Deferred taxes on unrealized gain (loss) on derivatives, tax effect	$ 6	$ 5	$ 19

XML

Consolidated Statement of Stockholder's Equity - USD ($) $ in Millions	Total	Common Stock	Capital in excess of par value	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock
Balance at beginning of period at Dec. 31, 2012	$ 6,992	$ 808	$ 1,210	$ 5,768	$ (119)	$ (675)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	(540)	0	0	0	0	(540)
Issuance of common and treasury stock pursuant to Employee stock plans	96	0	12	0	0	84
Net tax benefit (expense) of options exercised		0		0	0	0
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(9)		(9)
Share-based compensation	18	0	18	0	0	0
Cash dividends	(91)	0	0	(91)	0	0
Comprehensive income	870	0	0	754	116	0
Balance at end of period at Dec. 31, 2013	7,336	808	1,231	6,431	(3)	(1,131)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	(955)	0	0	0	0	(955)
Issuance of common and treasury stock pursuant to Employee stock plans	100	0	40	0	0	60
Net tax benefit (expense) of options exercised	23	0	23	0	0	0
Share-based compensation	21	0	21	0	0	0
Cash dividends	(151)	0	0	(151)	0	0
Comprehensive income	401	0	0	1,136	(735)	0
Balance at end of period at Dec. 31, 2014	6,775	808	1,315	7,416	(738)	(2,026)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock	(1,180)	0	0	0	0	(1,180)
Issuance of common and treasury stock pursuant to Employee stock plans	30	0	6	0	0	24
Net tax benefit (expense) of options exercised	24	0	24	0	0	0
Share-based compensation	29	0	29	0	0	0
Cash dividends	(188)	0	0	(188)	0	0
Comprehensive income	1,868	0	0	2,181	(313)	0
Balance at end of period at Dec. 31, 2015	$ 7,358	$ 808	$ 1,374	$ 9,409	$ (1,051)	$ (3,182)

XML

Consolidated Statement of Stockholder's Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends, per share (in dollars per share)	$ 0.2850	$ 0.22	$ 0.13

XML

Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,181	$ 1,136	$ 754
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,015	938	867
Unrealized (gain) loss on fuel derivative instruments	113	279	(5)
Deferred income taxes	(109)	501	50
Changes in certain assets and liabilities:
Accounts and other receivables	(88)	54	(17)
Other assets	103	142	(46)
Accounts payable and accrued liabilities	961	36	343
Air traffic liability	94	326	400
Cash collateral received from (provided to) derivative counterparties	(570)	(233)	57
Other, net	(462)	(277)	74
Net cash provided by operating activities	3,238	2,902	2,477
Net cash used in investing activities
Capital expenditures	(2,041)	(1,748)	(1,433)
Assets constructed for others	(102)	(80)	(14)
Purchases of short-term investments	(1,986)	(3,080)	(3,135)
Proceeds from sales of short-term and other investments	2,223	3,185	3,198
Other, net	(7)	(4)	0
Net cash used in investing activities	(1,913)	(1,727)	(1,384)
Net cash used in financing activities
Proceeds from issuance of long-term debt	500	300	0
Proceeds from Employee stock plans	46	110	96
Reimbursement for assets constructed for others	24	27	0
Proceeds from termination of interest rate derivative instrument	12	0	0
Payments of long-term debt and capital lease obligations	(213)	(561)	(313)
Payments of cash dividends	(180)	(139)	(71)
Repayment of construction obligation	(10)	(11)	(5)
Repurchase of common stock	(1,180)	(955)	(540)
Other, net	(23)	(19)	(18)
Net cash used in financing activities	(1,024)	(1,248)	(851)
NET CHANGE IN CASH AND CASH EQUIVALENTS	301	(73)	242
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	1,282	1,355	1,113
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,583	1,282	1,355
CASH PAYMENTS FOR:
Interest	105	128	133
Income taxes	1,440	155	346
SUPPLEMENTAL DISCLOSURE OF NONCASH TRANSACTIONS:
Flight equipment under capital leases	193	153	26
Assets constructed for others	$ 192	$ 88	$ 105

XML

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

Southwest Airlines Co. (the “Company”) operates Southwest Airlines, a major domestic airline. The Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries, which include AirTran Holdings, LLC. On May 2, 2011 (the “acquisition date”), the Company acquired all of the outstanding equity of AirTran Holdings, Inc. (“AirTran Holdings”), the former parent company of AirTran Airways, Inc. (“AirTran Airways”). Throughout these Notes, the Company makes reference to AirTran, which is meant to be inclusive of AirTran Holdings, LLC, the successor to AirTran Holdings, and its subsidiaries, including among others, AirTran Airways. AirTran's final passenger service was on December 28, 2014. Although the vast majority of integration costs were incurred in periods prior to 2015, the Company incurred some additional costs in 2015 associated with the integration of AirTran, and those costs are included in Acquisition and integration costs in the accompanying Consolidated Statement of Comprehensive Income. See Note 7 for further information. The accompanying Consolidated Financial Statements include the results of operations and cash flows for all periods presented and all significant inter-entity balances and transactions have been eliminated. The preparation of financial statements in conformity with generally accepted accounting principles in the United States (GAAP) requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates.

On November 20, 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2015-17, Balance Sheet Classification of Deferred Taxes. The standard amends the current requirement for organizations to present deferred tax liabilities and assets as current and noncurrent in a classified balance sheet. Instead, organizations will now be required to classify all deferred tax assets and liabilities as noncurrent. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, with early adoption permitted. The Company early adopted this standard during fourth quarter 2015, utilizing retrospective application as permitted. As such, certain prior period amounts have been reclassified to conform to the current presentation. In the Consolidated Balance Sheet as of December 31, 2014, the Company reclassified $477 million from current Deferred income tax assets to reduce Deferred income taxes within non-current liabilities.

Cash and Cash Equivalents

Cash in excess of that necessary for operating requirements is invested in short-term, highly liquid, income-producing investments. Investments with original maturities of three months or less when purchased are classified as cash and cash equivalents, which primarily consists of certificates of deposit, money market funds, and investment grade commercial paper issued by major corporations and financial institutions. Cash and cash equivalents are stated at cost, which approximates fair value.

As of December 31, 2015, $835 millionin cash collateral deposits were provided by the Company to its fuel hedge counterparties and no cash collateral deposits were held by or provided by the Company to its interest rate hedge counterparties. As of December 31, 2014, $266 million in cash collateral deposits were provided by the Company to its fuel hedge counterparties and no cash collateral deposits were held by or provided by the Company to its interest rate hedge counterparties. Cash collateral amounts provided or held associated with fuel and interest rate derivative instruments are not restricted in any way and earn interest income at an agreed upon rate that approximates the rates earned on short-term securities issued by the U.S. Government. Depending on the fair value of the Company’s fuel and interest rate derivative instruments, the amounts of collateral deposits held or provided at any point in time can fluctuate significantly. See Note 10 for further information on these collateral deposits and fuel derivative instruments.

Short-term and Noncurrent Investments

Short-term investments consist of investments with original maturities of greater than three months but less than twelve months when purchased. These are primarily short-term securities issued by the U.S. Government and certificates of deposit issued by domestic banks. All of these investments are classified as available-for-sale securities and are stated at fair value, which approximates cost. For all short-term investments, at each reset period or upon reinvestment, the Company accounts for the transaction as Proceeds from sales of short-term investments for the security relinquished, and Purchases of short-investments for the security purchased, in the accompanying Consolidated Statement of Cash Flows. Unrealized gains and losses, net of tax, if any, are recognized in Accumulated other comprehensive income (loss) (“AOCI”) in the accompanying Consolidated Balance Sheet. Realized net gains and losses on specific investments, if any, are reflected in Interest income in the accompanying Consolidated Statement of Income. Both unrealized and realized gains and/or losses associated with investments were immaterial for all years presented.

Noncurrent investments consist of investments with maturities of greater than twelve months. Noncurrent investments are included as a component of Other assets in the Consolidated Balance Sheet.

Accounts and Other Receivables

Accounts and other receivables are carried at cost. They primarily consist of amounts due from credit card companies associated with sales of tickets for future travel, and amounts due from business partners in the Company’s frequent flyer program. The allowance for doubtful accounts was immaterial at December 31, 2015 and 2014. In addition, the provision for doubtful accounts and write-offs for 2015, 2014, and 2013 were each immaterial.

Inventories

Inventories primarily consist of aircraft fuel, flight equipment expendable parts, materials, and supplies. All of these items are carried at average cost, less an allowance for obsolescence. These items are generally charged to expense when issued for use. The reserve for obsolescence was $47 million and $46 million at December 31, 2015, and 2014, respectively. In addition, the Company’s provision for obsolescence and write-offs for 2015, 2014, and 2013 were each immaterial.

Property and Equipment

Property and equipment is stated at cost. Capital expenditures includes payments made for aircraft, other flight equipment, purchase deposits related to future aircraft deliveries, and ground and other property and equipment. Depreciation is provided by the straight-line method to estimated residual values over periods generally ranging from 23 to 25 years for flight equipment, 5 to 30 years for ground property and equipment once the asset is placed in service, and 25 to 30 years for Assets constructed for others. Residual values estimated for aircraft generally range from 2 to 20 percent, for ground property and equipment generally range from 0 to 10 percent, and for Assets constructed for others range from 17 to 25 percent. Property under capital leases and related obligations are initially recorded at an amount equal to the present value of future minimum lease payments computed on the basis of 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. Leasehold improvements generally are amortized on a straight-line basis over the shorter of the estimated useful life of the improvement or the remaining term of the lease. Assets constructed for others primarily consists of airport improvement projects, once placed into service, in which the Company is considered the accounting owner of the facilities, and such assets are amortized to estimated residual value over the term of the Company's lease or the expected life of the asset. See Note 4 for further information.

Based on a revision of the Company's future firm aircraft order book with Boeing at the end of December 2015, the Company changed the estimated retirement dates of many of its owned 737-300 and 737-500 aircraft. Previously, this fleet was estimated to retire by mid-2021; however, pursuant to this change, the fleet and related parts are expected to be retired by mid-2018. See Note 4 for further information on the Company's future firm aircraft deliveries. This change in retirement dates is considered a change in estimate. It has been accounted for on a prospective basis, and thus the Company will record accelerated depreciation expense over the remainder of the useful lives for each aircraft and its related parts. The impact of this change on the year ended December 31, 2015 was immaterial. The impact of this change in estimate in 2016 is an approximate $89 million increase to Depreciation and amortization expense.

The Company evaluates its long-lived assets used in operations for impairment when events and circumstances indicate that the undiscounted cash flows to be generated by that asset are less than the carrying amounts of the asset and may not be recoverable. Factors that would indicate potential impairment include, but are not limited to, significant decreases in the market value of the long-lived asset(s), a significant change in the long-lived asset’s physical condition, and operating or cash flow losses associated with the use of the long-lived asset. If an asset is deemed to be impaired, an impairment loss is recorded for the excess of the asset book value in relation to its estimated fair value.

Aircraft and Engine Maintenance

The cost of scheduled inspections and repairs and routine maintenance costs for all aircraft and engines are charged to Maintenance materials and repairs expense as incurred. The Company also has “power-by-the-hour” agreements related to certain of its aircraft engines with external service providers. Under these agreements, which the Company has determined effectively transfer the risk and create an obligation associated with the maintenance on such engines to the counterparty, expense is recorded commensurate with each hour flown on an engine. In situations where the payments to the counterparty do not sufficiently match the level of services received during the period, expense is recorded on a straight-line basis over the term of the agreement based on the Company's best estimate of expected future aircraft utilization. For its engine maintenance contracts that do not transfer risk to the service provider, the Company records expense on a time and materials basis when an engine repair event takes place. Modifications that significantly enhance the operating performance or extend the useful lives of aircraft or engines are capitalized and amortized over the remaining life of the asset.

Goodwill and Intangible Assets

The Company applies a fair value based impairment test to the carrying value of goodwill and indefinite-lived intangible assets annually on October 1st, or more frequently if certain events or circumstances indicate that an impairment loss may have been incurred. The Company assesses the value of goodwill and indefinite-lived assets under either a qualitative or quantitative approach. Under a qualitative approach, the Company considers various market factors, including applicable key assumptions listed below. These factors are analyzed to determine if events and circumstances could reasonably have affected the fair value of goodwill and indefinite-lived intangible assets. If the Company determines that it is more likely than not that an indefinite-lived intangible asset is impaired, the quantitative approach is used to assess the asset’s implied fair value and the amount of the impairment. Under a quantitative approach, the implied fair value of the Company's identifiable assets and liabilities is calculated based on key assumptions. If the Company assets' carrying value exceeds the fair value calculated using the quantitative approach, an impairment charge is recorded for the difference in fair value and carrying value.

The following table is a summary of the Company’s intangible assets, which are included as a component of Other assets in the Company's Consolidated Balance Sheet, as of December 31, 2015 and 2014:

		Year ended December 31, 2015				Year ended December 31, 2014
(in millions)	Weighted-average useful life (in years)	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated Amortization
Customer relationships/marketing agreements	9	$	38	$	30	$	38	$	26
Trademarks/trade names	6	36		34		36		30
Owned domestic slots	Indefinite	303		n/a		303		n/a
Leased domestic slots (b)	47	17		3		19		5
Gate leasehold rights (a)	15	180		43		60		32
Total	15	$	574	$	110	$	456	$	93

(a) Intangible assets primarily consist of acquired leasehold rights to certain airport owned gates at Chicago’s Midway International Airport, takeoff and landing slots (a “slot” is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration (“FAA”), to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports, and certain intangible assets recognized from the AirTran acquisition. The increase in Intangible assets during 2015 was primarily due to the acquisition of two additional airport gate rights at Dallas Love Field, which were subleased from United Airlines. The purchase price paid for these airport gate rights was included as a component of Capital expenditures in the accompanying Consolidated Statement of Cash Flows.

(b) Useful life of leased slots is based on the stated lease term.

The aggregate amortization expense for 2015, 2014, and 2013 was $19 million, $13 million, and $19 million, respectively. Estimated aggregate amortization expense for the five succeeding years and thereafter is as follows: 2016 – $17 million, 2017 – $14 million, 2018 – $13 million, 2019 – $13 million, 2020 – $12 million, and thereafter – $89 million.

Revenue Recognition

Tickets sold are initially deferred as Air traffic liability. Passenger revenue is recognized when transportation is provided. Air traffic liability primarily represents tickets sold for future travel dates and funds that are past flight date and remain unused. The majority of the Company’s tickets sold are nonrefundable. Refundable tickets that are sold but not flown on the travel date can be reused for another flight, up to a year from the date of sale, or refunded. A small percentage of tickets (or partial tickets) expire unused. The Company estimates the amount of tickets that expire unused and recognizes such amounts in Passenger revenue using the redemption method based on scheduled flight date. Prior to September 13, 2013, funds associated with tickets in which a passenger did not show up for a flight without canceling were able to be reused on another flight for up to twelve months. On September 13, 2013, Southwest implemented a No Show policy that applies to nonrefundable fares that are not canceled or changed by a Customer at least ten minutes prior to a flight's scheduled departure. Based on the Company's revenue recognition policy, revenue is recorded at the flight date for a Customer who does not change his/her itinerary and loses his/her funds. Amounts collected from passengers for ancillary service fees are generally recognized as Other revenue when the service is provided, which is typically the flight date.

The Company's policy is to record revenue for the estimated spoilage of tickets (including partial tickets) once the flight date has passed, under the redemption method. Initial spoilage estimates are routinely adjusted and ultimately finalized once the tickets expire, which is typically twelve months after the original purchase date. Spoilage estimates are based on the Customers' historical travel behavior as well as assumptions about the Customers' future travel behavior. Assumptions used to generate spoilage estimates can be impacted by several factors including, but not limited to: fare increases, fare sales, changes to the Company's ticketing policies, changes to the Company’s refund, exchange and unused funds policies, or economic factors.

The Company is also required to collect certain taxes and fees from Customers on behalf of government agencies and remit these back to the applicable governmental entity on a periodic basis. These taxes and fees include foreign and U.S. federal transportation taxes, federal security charges, and airport passenger facility charges. 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.

Frequent Flyer Program

The Company records a liability for the estimated incremental cost of providing free travel under its frequent flyer program for all amounts earned from flight activity that are expected to be redeemed for future travel. The estimated incremental cost includes direct passenger costs such as fuel, food, and other operational costs, but does not include any contribution to fixed overhead costs or profit.

Southwest also sells frequent flyer points and related services to companies participating in its frequent flyer program. Historically, funds received from the sale of points associated with these agreements were accounted for under the residual method. Under this method, the Company estimated the portion of the amounts received from the sale of frequent flyer points that related to free travel and these amounts were deferred and recognized as Passenger revenue when the ultimate free travel awards are flown. On July 1, 2015, the Company executed an amended co-branded credit card agreement ("Agreement") with Chase Bank USA, N.A. (“Chase”), through which the Company sells loyalty points and other items to Chase. This material modification triggered an accounting change under ASU 2009-13, which is recorded on a prospective basis. The impact of the accounting change is that the Company estimated the selling prices and volumes over the term of the Agreement in order to determine the allocation of proceeds to each of the deliverables (travel points to be awarded; use of the Southwest Airlines’ brand and access to Rapid Reward Member lists; advertising elements; and the Company’s resource team). The Company records passenger revenue related to air transportation and certificates for discounted companion travel when the transportation is delivered. The other elements are recognized as Other - net revenue when earned.

The Company followed the transition approach of ASU 2009-13, which required that the Company adjust the existing deferred revenue balance to reflect the value, on a relative selling price basis, of any undelivered element remaining at the date of contract modification. The relative selling price of the undelivered element (air transportation) was lower than the rate at which it had been deferred under the previous contract, and the Company recorded a one-time, non-cash adjustment to decrease frequent flyer deferred revenue and increase revenue through the recording of a Special revenue adjustment of $172 million. In addition, 2015 Operating revenues increased by a net $255 million as a result of the Agreement and the resulting July 1, 2015 change in accounting methodology, all of which would have been deferred under the Company's previous accounting. The estimated impacts on revenue and earnings from this change in accounting principle are as follows:

(in millions, except per share amounts)	Year ended December 31, 2015
Passenger revenue	$	(89	)
Special revenue adjustment	172
Other revenue	344
Operating revenues	$	427
Net income	$	227
Net income per basic share	$	0.34
Net income per diluted share	$	0.34

For all points sold to business partners that are expected to expire unused, the Company recognizes spoilage in accordance with the redemption method. The Company’s consolidated liability associated with the sale of frequent flyer points, was approximately $1.3 billion as of December 31, 2015, and 2014, which is classified within Air traffic liability. During fourth quarter 2014, the Company obtained sufficient historical behavioral data to develop a predictive statistical model to analyze the amount of spoilage expected for points sold to business partners, which indicated an increase in the expected spoilage rate. This change in estimate was recorded on a prospective basis, as of October 1, 2014, the impacts on revenue and earnings are as follows:

(in millions, except per share amounts)	Year ended December 31, 2015		Year ended December 31, 2014
Passenger revenue	$	115	$	55
Net income	$	61	$	29
Net income per basic share	$	0.09	$	0.04
Net income per diluted share	$	0.09	$	0.04

Advertising

Advertising costs are charged to expense as incurred. Advertising and promotions expense for the years ended December 31, 2015, 2014, and 2013 was $218 million, $207 million, and $208 million, respectively, and is included as a component of Other operating expense in the accompanying Consolidated Statement of Income.

Share-based Employee Compensation

The Company has share-based compensation plans covering certain Employees, including a plan that also covers the Company’s Board of Directors. The Company accounts for share-based compensation based on its grant date fair value. See Note 9 for further information.

Financial Derivative Instruments

The Company accounts for financial derivative instruments at fair value and applies hedge accounting rules where appropriate. The Company utilizes various derivative instruments, including jet fuel, crude oil, unleaded gasoline, and heating oil-based derivatives, to attempt to reduce the risk of its exposure to jet fuel price increases. These instruments consist primarily of purchased call options, collar structures, call spreads, put spreads, and fixed price swap agreements, and upon proper qualification are accounted for as cash-flow hedges. The Company also has interest rate swap agreements to convert a portion of its fixed-rate debt to floating rates and has swap agreements that convert certain floating-rate debt to a fixed-rate. These interest rate hedges are appropriately designated as either fair value hedges or as cash flow hedges.

Since the majority of the Company’s financial derivative instruments are not traded on a market exchange, the Company estimates their fair values. Depending on the type of instrument, the values are determined by the use of present value methods or option value models with assumptions about commodity prices based on those observed in underlying markets. Also, since there is not a reliable forward market for jet fuel, the Company must estimate the future prices of jet fuel in order to measure the effectiveness of the hedging instruments in offsetting changes to those prices. Forward jet fuel prices are estimated through utilization of a statistical-based regression equation with data from market forward prices of like commodities. This equation is then adjusted for certain items, such as transportation costs, that are stated in the Company’s fuel purchasing contracts with its vendors.

For the effective portion of settled fuel hedges, the Company records the associated gains or losses as a component of Fuel and oil expense in the Consolidated Statement of Income. For amounts representing ineffectiveness, as defined, or changes in fair value of derivative instruments for which hedge accounting is not applied, the Company records any gains or losses as a component of Other (gains) losses, net, in the Consolidated Statement of Income. Amounts that are paid or received in connection with the purchase or sale of financial derivative instruments (i.e., premium costs of option contracts) are classified as a component of Other (gains) losses, net, in the Consolidated Statement of Income in the period in which the instrument settles or expires. All cash flows associated with purchasing and selling derivatives are classified as operating cash flows in the Consolidated Statement of Cash Flows, within Changes in certain assets and liabilities. See Note 10 for further information on hedge accounting and financial derivative instruments.

The Company classifies its cash collateral provided to or held from counterparties in a “net” presentation on the Consolidated Balance Sheet against the fair value of the derivative positions with those counterparties. See Note 10 for further information.

Software Capitalization

The Company capitalizes certain internal and external costs related to the acquisition and development of internal use software during the application development stages of projects. The Company amortizes these costs using the straight-line method over the estimated useful life of the software, which typically ranges from five to fifteen years. Costs incurred during the preliminary project or the post-implementation/operation stages of the project are expensed as incurred. Capitalized computer software, included as a component of Ground property and equipment in the accompanying Consolidated Balance Sheet, net of accumulated depreciation, was $378 million and $403 million at December 31, 2015, and 2014, respectively. Computer software depreciation expense was $106 million, $122 million, and $90 million for the years ended December 31, 2015, 2014, and 2013, respectively, and is included as a component of Depreciation and amortization expense in the accompanying Consolidated Statement of Income.

Income Taxes

The Company accounts for deferred income taxes utilizing an asset and liability method, whereby deferred tax assets and liabilities are recognized based on the tax effect of temporary differences between the financial statements and the tax basis of assets and liabilities, as measured by current enacted tax rates. The Company also evaluates the need for a valuation allowance to reduce deferred tax assets to estimated recoverable amounts. See "Basis of Presentation" for further information on current presentation of deferred income taxes.

The Company’s policy for recording interest and penalties associated with uncertain tax positions is to record such items as a component of income before income taxes. Penalties are recorded in Other (gains) losses, net, and interest paid or received is recorded in Interest expense or Interest income, respectively, in the Consolidated Statement of Income. Amounts recorded for penalties and interest related to uncertain tax positions were immaterial for all years presented.

Concentration Risk

Approximately 83 percent of the Company’s full-time equivalent Employees are unionized and are covered by collective-bargaining agreements. The majority of the Company's unionized Employees, including its Pilots, Mechanics, Ramp, Operations, Provisioning and Freight Agents, Flight Attendants, Material Specialists, Flight Crew Training Instructors, Facilities Maintenance Technicians, and Source of Support Representatives are in discussions on labor agreements or have labor agreements which will become amendable within one year. These Employee groups represent approximately 69 percent of the Company’s full-time equivalent Employees as of December 31, 2015.

The Company attempts to minimize its concentration risk with regards to its cash, cash equivalents, and its investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security or money market fund.

To manage risk associated with financial derivative instruments held, the Company selects and will periodically review counterparties based on credit ratings, limits its exposure to a single counterparty, and monitors the market position of the program and its relative market position with each counterparty. The Company also has agreements with counterparties containing early termination rights and/or bilateral collateral provisions whereby security is required if market risk exposure exceeds a specified threshold amount or credit ratings fall below certain levels. Collateral deposits provided to or held from counterparties serve to decrease, but not totally eliminate, the credit risk associated with the Company’s hedging program. See Note 10 for further information.

As of December 31, 2015, the Company operated an all-Boeing fleet, all of which are variations of the Boeing 737. Following the 2011 acquisition of AirTran, the Company also operated a fleet of Boeing 717's, but these aircraft were removed from the Company's operations prior to the end of 2014. See Note 7 for further information. If the Company were unable to acquire additional aircraft or associated aircraft parts from Boeing, or Boeing were unable or unwilling to make timely deliveries of aircraft or to provide adequate support for its products, the Company’s operations would be materially adversely impacted. In addition, the Company would be materially adversely impacted in the event of a mechanical or regulatory issue associated with the Boeing 737 aircraft type, whether as a result of downtime for part or all of the Company’s fleet, increased maintenance costs, or because of a negative perception by the flying public. The Company is also dependent on sole suppliers for aircraft engines and certain other aircraft parts and would, therefore, also be materially adversely impacted in the event of the unavailability of, or a mechanical or regulatory issue associated with, engines and other parts.

The Company has historically entered into agreements with some of its co-brand, payment, and loyalty partners that contain exclusivity aspects which place certain confidential restrictions on the Company from entering into certain arrangements with other payment and loyalty partners. These arrangements generally extend for the terms of the partnerships, none of which currently extend beyond May 2022. The Company believes the financial benefits generated by the exclusivity aspects of these arrangements outweigh the risks involved with such agreements.

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NEW ACCOUNTING PRONOUNCEMENTS

12 Months Ended

Dec. 31, 2015

Accounting Changes and Error Corrections [Abstract]

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS AND ACCOUNTING CHANGES

On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. Following the FASB's finalization of a one year deferral of this standard, the ASU is now effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2017, with early adoption permitted for fiscal years, and interim periods within those years, beginning on or after December 15, 2016. The Company currently believes the most significant impact of this ASU on its accounting will be the elimination of the incremental cost method for frequent flyer accounting, which will require the Company to re-value its liability earned by Customers associated with flight points with a relative fair value approach, resulting in a significant increase in the liability. The Company is continuing to evaluate the new guidance and plans to provide additional information about its expected financial impact, including the expected method and period of adoption, at a future date.

On February 18, 2015, the FASB and the International Accounting Standards Board issued a final standard that amends the current consolidation guidance. The standard amends both the variable interest entity and voting interest entity consolidation models. The standard is effective for public reporting entities in fiscal periods beginning after December 15, 2015, and early adoption is permitted. Once adopted, the Company will need to assess the potential for entity consolidation under a new consolidation model; however, the Company does not believe this will result in changes to its previous consolidation conclusions. The Company will adopt this new standard during first quarter 2016.

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NET INCOME PER SHARE

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

NET INCOME PER SHARE

NET INCOME PER SHARE

The following table sets forth the computation of basic and diluted net income per share (in millions except per share amounts):

	Year ended December 31,
	2015		2014		2013
NUMERATOR:
Net income	$	2,181	$	1,136	$	754
Incremental income effect of   interest on 5.25% convertible notes	4		4		3
Net income after assumed conversion	$	2,185	$	1,140	$	757
DENOMINATOR:
Weighted-average shares outstanding, basic	661		687		710
Dilutive effect of Employee stock options and   restricted stock units	2		3		2
Dilutive effect of 5.25% convertible notes	6		6		6
Adjusted weighted-average shares outstanding, diluted	669		696		718
NET INCOME PER SHARE:
Basic	$	3.30	$	1.65	$	1.06
Diluted	$	3.27	$	1.64	$	1.05
Potentially dilutive amounts excluded from calculations:
Stock options and restricted stock units	—		—		9

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COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Commitments

The Company has contractual obligations and commitments primarily with regard to future purchases of aircraft, repayment of debt, and lease arrangements. During the year endedDecember 31, 2015, the Company purchased 19 new 737-800 aircraft from Boeing and eight used 737-700 aircraft from third parties. In addition, the Company also leased 16 737-700 aircraft from third parties, and retired from service four of its older aircraft (two 737-300 and two 737-500).

In December 2015, the Company and Boeing agreed to modify the existing schedule of future aircraft commitments to reflect 33 additional -800s, and the conversion of its remaining 25 -700 firm orders to -800s. In addition, two pre-owned -700s were added to its delivery schedule. A total of six additional options were added to the schedule as well. As of December 31, 2015, the Company had firm deliveries and options for Boeing 737-700, 737-800, 737 MAX 7, and 737 MAX 8 aircraft as follows:

	The Boeing Company 737 NG				The Boeing Company 737 MAX
	-800 Firm Orders	Options	Additional -700 A/C		-7 Firm Orders	-8 Firm Orders		Options	Total
2016	36	—	17		—	—		—	53
2017	35	—	14		—	14		—	63
2018	18	18	4		—	13		—	53
2019	—	—	—		15	10		—	25
2020	—	—	—		14	22		—	36
2021	—	—	—		1	33		18	52
2022	—	—	—		—	30		19	49
2023	—	—	—		—	24		23	47
2024	—	—	—		—	24		23	47
2025	—	—	—		—	—		36	36
2026	—	—	—		—	—		36	36
2027	—	—	—		—	—		36	36
Total	89	18	35	(b)	30	170	(a)	191	533

(a) The Company has flexibility to substitute MAX 7 in lieu of MAX 8 firm orders beginning in 2019.

(b) To be acquired in leases from various third parties.

The Company's financial commitments associated with the Boeing firm orders and additional scheduled deliveries in the above aircraft table are as follows: $1.1 billion in 2016, $1.3 billion in 2017, $1.1 billion in 2018, $1.2 billion in 2019, $1.5 billion in 2020, and $4.4 billion thereafter.

Fort Lauderdale-Hollywood International Airport

In December 2013, the Company entered into an agreement with Broward County, Florida, which owns and operates Fort Lauderdale-Hollywood International Airport, to oversee and manage the design and construction of the airport's Terminal 1 Modernization Project at a cost not to exceed $295 million. In addition to significant improvements to the existing Terminal 1, the project includes the design and construction of a new five-gate Concourse A with an international processing facility. Funding for the project will come directly from Broward County sources, but will flow through the Company in its capacity as manager of the project. Major construction on the project began during third quarter 2015 and is estimated to be completed during 2017. The Company believes that, due to its agreed upon role in overseeing and managing the project, it is considered the owner of the project for accounting purposes. As such, during construction, the Company records expenditures as Assets constructed for others in the Consolidated Balance Sheet, along with a corresponding outflow within Assets constructed for others in the Consolidated Statement of Cash Flows, and an increase to Construction obligation (with a corresponding cash inflow from Financing activities in the Consolidated Statement of Cash Flows) as reimbursements are received from Broward County. As of December 31, 2015, the Company had recorded construction costs related to the project of $25 million.

Houston William P. Hobby Airport

The Company entered into a Memorandum of Agreement (“MOA”) with the City of Houston (“City”), effective June 2012, to expand the existing Houston Hobby airport facility. As provided in the MOA, the Company and the City entered into an Airport Use and Lease Agreement (“Lease”) to control the execution of this expansion and the financial terms thereof. Per the MOA and Lease, this project provided a new five-gate international terminal with international passenger processing facilities, expansion of the security checkpoint, and upgrades to the Southwest Airlines ticket counter area. The project cost approximately $156 million, and the Company provided the funding for, as well as management over, the project. In return, the capital cost portion of the rent the Company pays for the international facility is waived from the initial occupancy until the expiration of the Lease. However, at any point following completion of the project, the City has the option to reimburse the Company's investment at the then-unamortized cost of the facility. This purchase would trigger payment of the previously waived capital cost component of rents owed the City. Additionally, a small portion of the project qualified for rental credits that will be utilized against the Company’s 2016 lease payments at the airport. Construction was effectively completed in October 2015, at which time the Company began operating from the new facility.

As a result of its significant involvement in the Houston Hobby project, the Company determined that it is the owner of the facility for accounting purposes. As such, during construction, the Company recorded expenditures as Assets constructed for others in the Consolidated Balance Sheet, along with a corresponding outflow within Assets constructed for others, in the Consolidated Statement of Cash Flows. As of December 31, 2015, the Company had recorded construction costs related to Houston Hobby of $146 million.

Los Angeles International Airport

In March 2013, the Company executed a lease agreement with Los Angeles World Airports (“LAWA”), which owns and operates Los Angeles International Airport ("LAX"). Under the lease agreement, which was amended in June 2014, the Company is overseeing and managing the design, development, financing, construction and commissioning of the airport's Terminal 1 Modernization Project (the “Project”) at a cost not to exceed $526 million. The Project is being funded primarily using the Regional Airports Improvement Corporation ("RAIC"), which is a quasi-governmental special purpose entity that acts as a conduit borrower under a syndicated credit facility provided by a group of lenders. Loans made under the credit facility are being used to fund the development of the Project, and the outstanding loans will be repaid with the proceeds of LAWA’s payments to purchase completed Project phases. The Company has guaranteed the obligations of the RAIC under the credit facility. Construction on the Project began during 2014 and is estimated to be completed during 2018. The Company believes that, due to its agreed upon role in overseeing and managing the Project, it is considered the owner of the Project for accounting purposes. LAWA will reimburse the Company for the non-proprietary renovations, while the Company will not be reimbursed for proprietary renovations. As a result, the $196 million of costs incurred as of December 31, 2015, are included within Assets constructed for others, and all amounts that have been or will be reimbursed will be included within Construction obligation on the accompanying Consolidated Balance Sheet.

Dallas Love Field

During 2008, the City of Dallas approved the Love Field Modernization Program (“LFMP”), a project to reconstruct Dallas Love Field with modern, convenient air travel facilities. Pursuant to a Program Development Agreement with the City of Dallas and the Love Field Airport Modernization Corporation (or “LFAMC,” a Texas non-profit “local government corporation” established by the City of Dallas to act on the City of Dallas' behalf to facilitate the development of the LFMP), the Company managed this project. Major construction was effectively completed by December 31, 2014. This project consisted of the complete replacement of gate facilities with a new 20-gate facility, including infrastructure, systems and equipment, aircraft parking apron, fueling system, roadways and terminal curbside, baggage handling systems, passenger loading bridges and support systems, and other supporting infrastructure.

Although the City of Dallas received commitments from various sources that are helping to fund portions of this LFMP project, including the Federal Aviation Administration (“FAA”), the Transportation Security Administration, and the City of Dallas' Aviation Fund, the majority of the funds used were from the issuance of bonds. During fourth quarter 2010, $310 million of such bonds were issued by the LFAMC, and the Company has guaranteed principal and interest payments on the bonds. An additional tranche of such bonds totaling $146 million was issued during second quarter 2012, and the Company has guaranteed the principal and interest payments on these bonds as well.

In conjunction with the Company's significant presence at Dallas Love Field, the Company agreed to manage the majority of the LFMP project. Based on the pertinent factors in place at the time the agreement was made, the Company utilized the accounting guidance provided for lessees involved in asset construction. As of December 31, 2015, the Company had recorded LFMP construction costs of $548 million within Assets constructed for others and had recorded a liability of $536 million within Construction obligation in its Consolidated Balance Sheet. Upon completion of different phases of the LFMP project, the Company has placed the associated assets in service and has begun depreciating the assets over their estimated useful lives. The amount of depreciation recorded for the year endedDecember 31, 2015, associated with the LFMP assets in service was $36 million. The corresponding LFMP liabilities are being reduced primarily through the Company's airport rental payments to the City of Dallas as the construction costs of the project are passed through to the Company via recurring airport rates and charges. A portion of these payments are reflected as Repayment of construction obligation in the Consolidated Statement of Cash Flows. The imputed interest rate associated with construction obligation was nominal for 2015 and 2014. During 2015, the City of Dallas issued additional bonds for the construction of a new parking garage. The Company has not guaranteed the principal or interest payments on these bonds, but remains the accounting owner of this project.

Contingencies

The Company is from time to time subject to various legal proceedings and claims arising in the ordinary course of business, including, but not limited to, examinations by the IRS. The Company's management does not expect that the outcome in any of its currently ongoing legal proceedings or the outcome of any adjustments presented by the IRS, individually or collectively, will have a material adverse effect on the Company's financial condition, results of operations, or cash flow.

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SUPPLEMENTAL FINANCIAL INFORMATION

12 Months Ended

Dec. 31, 2015

Disclosure Text Block [Abstract]

SUPPLEMENTAL FINANCIAL INFORMATION

SUPPLEMENTAL FINANCIAL INFORMATION

(in millions)	December 31, 2015		December 31, 2014
Intangible assets	$	464	$	363
Non-current investments	40		35
Other	213		136
Other assets	$	717	$	534

(in millions)	December 31, 2015		December 31, 2014
Accounts payable trade	$	178	$	123
Salaries payable	173		160
Taxes payable	179		163
Aircraft maintenance payable	168		314
Fuel payable	48		85
Other payable	442		358
Accounts payable	$	1,188	$	1,203

(in millions)	December 31, 2015			December 31, 2014
Profitsharing and savings plans	$	655		$	374
Aircraft and other lease related obligations	74			159
Vacation pay	309			292
Accrued union bonuses	329		(a)	9
Health	86			84
Derivative contracts	643			174
Workers compensation	187			165
Property and other taxes	62			81
Other	246			227
Accrued liabilities	$	2,591		$	1,565

(a) As part of the ongoing negotiations with various union contract groups during 2015, the Company has recorded a liability for estimated bonuses that would be paid out to union members upon ratification of labor agreements. The liability excludes certain immaterial benefit costs that are included as a component of Accounts payable. The amount accrued is subject to change based on subsequent negotiations, and any changes would be recorded on a prospective basis.

(in millions)	December 31, 2015		December 31, 2014
Postretirement obligation	$	201	$	169
Non-current lease-related obligations	165		193
Other deferred compensation	179		174
Deferred gains from sale and leaseback of aircraft	43		53
Derivative contracts	74		622
Other	98		44
Other non-current liabilities	$	760	$	1,255

Other Operating Expenses

Other operating expenses consist of distribution costs, advertising expenses, personnel expenses, professional fees, and other operating costs, none of which individually exceed 10 percent of Operating expenses.

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LONG-TERM DEBT

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

LONG-TERM DEBT

LONG-TERM DEBT

(in millions)	December 31, 2015		December 31, 2014
5.75% Notes due 2016	$	307	$	313
5.25% Convertible Senior Notes due 2016	111		113
5.125% Notes due 2017	309		316
French Credit Agreements due 2018—1.53%	25		36
Fixed-rate 737 Aircraft Notes payable through 2018—7.02%	17		24
2.75% Notes due 2019	303		300
Term Loan Agreement due 2019—6.315%	143		178
Term Loan Agreement due 2019—4.84%	36		73
2.65% Notes due 2020	494		—
Term Loan Agreement due 2020—5.223%	329		372
Floating-rate 737 Aircraft Notes payable through 2020	257		300
Pass Through Certificates due 2022—6.24%	340		355
7.375% Debentures due 2027	132		134
Capital leases	395		199
	$	3,198	$	2,713
Less current maturities	637		258
Less debt discount and issuance costs	20		21
	$	2,541	$	2,434

AirTran Long-Term Debt

AirTran Holdings previously entered into aircraft purchase financing facilities, and as of December 31, 2015, 19 Boeing 737 aircraft remained that were financed under floating-rate facilities. Each note is secured by a first mortgage on the aircraft to which it relates. The notes bear interest at a floating rate per annum equal to a margin plus the three or six-month LIBOR in effect at the commencement of each semi-annual or three-month period, as applicable. As of December 31, 2015, the weighted average interest rate was 1.86 percent. Principal and interest under the notes are payable semi-annually or every three months as applicable. As of December 31, 2015, the remaining debt outstanding may be prepaid without penalty under all aircraft loans provided under such facilities. The notes mature in years 2016 to 2020. As discussed further in Note 10, a portion of the above floating-rate debt has been effectively converted to a fixed rate via interest rate swap agreements which expire between 2016 and 2020.

As of December 31, 2015, three Boeing 737 aircraft were financed under a fixed-rate facility. Each note is secured by a first mortgage on the aircraft to which it relates. As of December 31, 2015, the weighted average interest rate was 7.02 percent. Payments of principal and interest under the notes are due semi-annually. The notes mature in years 2016 to 2018.

In October 2009, AirTran Holdings completed a public offering of $115 million of convertible senior notes due November 1, 2016. Such notes bear interest at 5.25 percent payable semi-annually, in arrears, on May 1 and November 1. As a result of the acquisition and subsequent dividends declared by the Company, the convertible senior notes are convertible into AirTran conversion units of 168.6576 per $1,000 in principal amount of such notes. Based on the terms of the merger agreement, the holders of these notes would receive shares of the Company’s common stock at a conversion rate of 54.1391 shares and $615.16 in cash per $1,000 in principal amount of such notes. This conversion rate is subject to adjustment under certain circumstances such as: granting of stock and cash dividends, a make-whole fundamental change of ownership provision, the issuance of rights or warrants, and/or a distribution of capital stock. Subsequent to the acquisition, holders of $5 million in principal amount elected to convert their notes. Remaining holders may convert their convertible senior notes into cash and shares of common stock at their option at any time. The convertible senior notes are not redeemable at the Company’s option prior to maturity. The holders of the convertible senior notes may require the Company to repurchase such notes, in whole or in part, for cash upon the occurrence of a fundamental change, as defined in the governing supplemental indenture, at a repurchase price of 100 percent of the principal amount plus any accrued and unpaid interest.

As a result of triggering the fundamental change of ownership provision in the convertible senior notes and as a result of the acquisition, an embedded conversion option is deemed to exist. In accordance with applicable accounting guidance, the embedded conversion option was effectively separated and accounted for as a free-standing derivative. A fair value calculation, utilizing similar market yields and the Company’s common stock price, was performed for the debt with and without the equity to measure the equity component. The value allocated to the conversion option of $35 million is classified as permanent equity. The estimated premium associated with the notes excluding the equity feature was $10 million, and is being amortized to interest expense over the remaining life of the notes. The dilutive effect of the shares that would be issued if the convertible notes were converted is considered in the Company’s net income per share calculations, unless such conversion would be considered antidilutive. See Note 3.

Other Company Long-Term Debt

During November 2015, the Company issued $500 million senior unsecured notes due 2020. The notes bear interest at 2.65 percent, and are payable semi-annually in arrears on May 5 and November 5. Concurrently, the Company entered into a fixed-to-floating interest rate swap to convert the interest on these unsecured notes to a floating rate until their maturity. See Note 10 for further information on the interest-rate swap agreement.

During November 2014, the Company issued $300 million senior unsecured notes due 2019. The notes bear interest at 2.75 percent, payable semi-annually in arrears on May 6 and November 6. Concurrently, the Company entered into a fixed-to-floating interest rate swap to convert the interest on these unsecured notes to a floating rate until their maturity. See Note 10 for further information on the interest-rate swap agreement.

On July 1, 2009, the Company entered into a term loan agreement providing for loans to the Company aggregating up to $124 million, to be secured by mortgages on five of the Company’s 737-700 aircraft. The Company has borrowed the full $124 million and secured this loan with the requisite five aircraft mortgages. The loan matures on July 1, 2019, and is repayable semi-annually in installments of principal that began January 1, 2010. The loan bears interest at a fixed rate of 4.84 percent, and interest is payable semi-annually, which payments began on January 1, 2010. In September 2015, the Company prepaid $24 million on the loan agreement, which in turn released one of the encumbered aircraft. As such, the remaining four aircraft related to this transaction are still encumbered as of December 31, 2015.

On April 29, 2009, the Company entered into a term loan agreement providing for loans to the Company aggregating up to $332 million, to be secured by mortgages on 14 of the Company’s 737-700 aircraft. The Company borrowed the full $332 million and secured the loan with the requisite 14 aircraft mortgages. The loan matures on May 6, 2019, and is being repaid via quarterly installments of principal that began August 6, 2009. The loan bears interest at the LIBO Rate (as defined in the term loan agreement) plus 3.30 percent, and interest is payable quarterly, which payments began on August 6, 2009. Pursuant to the terms of the term loan agreement, the Company entered into an interest rate swap agreement to convert the variable rate on the term loan to a fixed 6.315 percent until maturity.

On May 6, 2008, the Company entered into a term loan agreement providing for loans to the Company aggregating up to $600 million, to be secured by first-lien mortgages on 21 of the Company’s 737-700 aircraft. On May 9, 2008, the Company borrowed the full $600 million and secured these loans with the requisite 21 aircraft mortgages. The loans mature on May 9, 2020, and are repayable quarterly in installments of principal, with the first payment made on August 9, 2008. The loans bear interest at the LIBO Rate (as defined in the term loan agreement) plus 0.95 percent, and interest is payable quarterly. Pursuant to the terms of the term loan agreement, the Company entered into an interest rate swap agreement to convert the variable rate on the term loan to a fixed 5.223 percent until maturity.

On October 3, 2007, grantor trusts established by the Company issued $500 million Pass Through Certificates consisting of $412 million6.15% Series A certificates and $88 million6.65% Series B certificates. A separate trust was established for each class of certificates. The trusts used the proceeds from the sale of certificates to acquire equipment notes in the same amounts, which were issued by the Company on a full recourse basis. Payments on the equipment notes held in each trust will be passed through to the holders of certificates of such trust. The equipment notes were issued for each of 16 Boeing 737-700 aircraft owned by the Company and are secured by a mortgage on each aircraft. Interest on the equipment notes held for the certificates is payable semi-annually, with the first payment made on February 1, 2008. Also beginning February 1, 2008, principal payments on the equipment notes held for both series of certificates are due semi-annually until the balance of the certificates mature on August 1, 2022. Prior to their issuance, the Company also entered into swap agreements to hedge the variability in interest rates on the Pass Through Certificates. The swap agreements were accounted for as cash flow hedges, and resulted in a payment by the Company of $20 million upon issuance of the Pass Through Certificates. The effective portion of the hedge is being amortized to interest expense concurrent with the amortization of the debt and is reflected in the above table as a reduction in the debt balance. The ineffectiveness of the hedge transaction was immaterial.

During December 2006, the Company issued $300 million senior unsecured notes due December 15, 2016. The notes bear interest at 5.75 percent, payable semi-annually in arrears, with the first payment made on June 15, 2007. During fourth quarter 2009, the Company entered into a fixed-to-floating interest rate swap to convert the interest on these unsecured notes to a floating rate; however, the interest rate swap was terminated in 2015. See Note 10 for further information on the interest-rate swap agreement and termination.

During February 2005, the Company issued $300 million senior unsecured notes due 2017. The notes bear interest at 5.125 percent, payable semi-annually in arrears, with the first payment made on September 1, 2005.

In fourth quarter 2004, the Company entered into four identical 13-year floating-rate financing arrangements, whereby it borrowed a total of $112 million from French banking partnerships. Although the interest rates on the borrowings float, the Company estimated at inception that, considering the full effect of the “net present value benefits” included in the transactions, the effective economic yield over the 13-year term of the loans will be approximately LIBOR minus 45 basis points. Principal and interest are payable semi-annually on June 30 and December 31 for each of the loans, and the Company may terminate the arrangements in any year on either of those dates, under certain conditions. The Company pledged four aircraft as collateral for the transactions.

On February 28, 1997, the Company issued $100 million of senior unsecured 7.375% debentures due March 1, 2027. Interest is payable semi-annually on March 1 and September 1. The debentures may be redeemed, at the option of the Company, in whole at any time or in part from time to time, at a redemption price equal to the greater of the principal amount of the debentures plus accrued interest at the date of redemption or the sum of the present values of the remaining scheduled payments of principal and interest thereon, discounted to the date of redemption at the comparable treasury rate plus20 basis points, plus accrued interest at the date of redemption. In January 2007, the Company entered into an interest rate swap agreement to convert this fixed-rate debt to a floating rate; however, the interest rate swap was terminated in December 2012.

The Company is required to provide standby letters of credit to support certain obligations that arise in the ordinary course of business. Although the letters of credit are an off-balance sheet item, the majority of the obligations to which they relate are reflected as liabilities in the Consolidated Balance Sheet. Outstanding letters of credit totaled $184 million at December 31, 2015.

The net book value of the assets pledged as collateral for the Company’s secured borrowings, primarily aircraft and engines, was $1.9 billion at December 31, 2015. In addition, the Company has pledged a total of up to 88 of its Boeing 737-700 and 12 of its Boeing 737-800 aircraft at a net book value of $2.5 billion, in the case that it has obligations related to its fuel derivative instruments with counterparties that exceed certain thresholds. See Note 10 for further information on these collateral arrangements.

As of December 31, 2015, aggregate annual principal maturities of debt and capital leases (not including amounts associated with interest rate swap agreements, interest on capital leases, amortization of capital lease incentives, and amortization of purchase accounting adjustments) for the five-year period ending December 31, 2020, and thereafter, were $617 million in 2016, $528 million in 2017, $272 million in 2018, $522 million in 2019, $751 million in 2020, and $424 million thereafter.

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LEASES

12 Months Ended

Dec. 31, 2015

Leases [Abstract]

LEASES

LEASES

The Company's fleet included 28 aircraft on capital lease as of December 31, 2015, compared with 16 aircraft on capital lease, including two B717s, as of December 31, 2014. Amounts applicable to these aircraft that are included in property and equipment were:

(in millions)	2015		2014
Flight equipment	$	435	$	214
Less: accumulated amortization	29		22
	$	406	$	192

Total rental expense for operating leases, both aircraft and other, charged to operations in 2015, 2014, and 2013 was $909 million, $931 million, and $997 million, respectively. The majority of the Company’s terminal operations space, as well as 95 aircraft, were under operating leases at December 31, 2015. For aircraft operating leases and for terminal operations leases, expense is included in Aircraft rentals and in Landing fees and other rentals, respectively, in the Consolidated Statement of Income. Future minimum lease payments under capital leases and noncancelable operating leases and rentals to be received under subleases with initial or remaining terms in excess of one year at December 31, 2015, were:

(in millions)	Capital leases		Operating leases		Subleases			LFMP facility lease*		Operating leases, net
2016	$	46	$	636	$	(103	)	$	24	$	557
2017	46		624		(103		)	24		545
2018	45		551		(102		)	25		474
2019	45		479		(97		)	25		407
2020	44		359		(78		)	26		307
Thereafter	209		961		(66		)	634		1,529
Total minimum lease payments	$	435	$	3,610	$	(549	)	$	758	$	3,819
Less amount representing interest	79
Present value of minimum lease payments	356
Less current portion	32
Long-term portion	$	324
* See Note 4 for further details

The aircraft leases generally can be renewed for one to five years at rates based on fair market value at the end of the lease term. Most aircraft leases have purchase options at or near the end of the lease term at fair market value, generally limited to a stated percentage of the lessor’s defined cost of the aircraft.

On July 9, 2012, the Company signed an agreement with Delta Air Lines, Inc. and Boeing Capital Corp. to lease or sublease all 88 of AirTran's B717s to Delta at agreed-upon lease rates. The first converted B717 was delivered to Delta in September 2013, and as of December 31, 2015, the Company had delivered a total of 87 B717s to Delta. As the Company previously announced, all B717s remaining at Southwest were grounded on December 28, 2014. The Company expects the one remaining B717 to be converted and delivered to Delta by early 2016. A total of 76 of the B717s are on operating lease, ten are owned, and two are on capital lease.

The Company paid the majority of the costs to convert the aircraft to the Delta livery and perform certain maintenance checks prior to the delivery of each aircraft. The agreement to pay these conversion and maintenance costs is a “lease incentive” under applicable accounting guidance. The sublease terms for the 76 B717s on operating lease and the two B717s on capital lease coincide with the Company's remaining lease terms for these aircraft from the original lessor, which range from approximately three to eight years. The leasing of the ten B717s that are owned by the Company is subject to certain conditions, and the lease terms are for up to seven years, after which Delta will have the option to purchase the aircraft at the then-prevailing market value. The ten owned B717s are accounted for as sales type leases, the two B717s classified by the Company as capital leases are accounted for as direct financing leases, and the remaining 76 subleases are accounted for as operating leases with Delta. With respect to the 87 B717s delivered to Delta as of December 31, 2015, the Company had 76 operating leases, nine sales type leases, and two direct financing leases. There are no contingent payments and no significant residual value conditions associated with the transaction.

The accounting for this transaction is based on the guidance provided for lease transactions. The Company recorded an initial charge of approximately $137 million during third quarter 2012, representing the remaining estimated cost, at the scheduled date of delivery of each B717 to Delta (including the conversion, maintenance, and other contractual costs to be incurred), of the Company's lease of the 76 B717s that are accounted for as operating leases, net of the future sublease income from Delta and the remaining unfavorable aircraft lease liability established as of the acquisition date. During 2014, the Company recorded an additional $22 million in expense for its revised estimate of conversion costs for these B717s, and an additional $9 million associated with the extension of time between when the Company removed the aircraft from revenue service, on December 28, 2014, and when they entered the conversion process. The charges recorded by the Company for this transaction were included as a component of Acquisition and integration costs in the Company's Consolidated Statement of Income and were included as a component of Other, net in Cash flows from operating activities in the Company's Consolidated Statement of Cash Flows, and the corresponding liability for this transaction is included as a component of Current liabilities and Other noncurrent liabilities in the Company's Consolidated Balance Sheet. A rollforward of the Company's B717 lease/sublease liability for 2015 and 2014 is shown below:

(in millions)	B717 lease/sublease liability
Balance at December 31, 2013	$	122
Lease/sublease accretion	5
Lease/sublease expense adjustment	22
Lease/sublease payments, net (a)	(86		)
Balance at December 31, 2014	$	63
Lease/sublease accretion	1
Lease/sublease expense adjustment	2
Lease/sublease payments, net (a)	(48		)
Balance at December 31, 2015	$	18

(a) Includes lease conversion cost payments

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COMMON STOCK

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

COMMON STOCK

COMMON STOCK

The Company has one class of capital stock, its common stock. Holders of shares of common stock are entitled to receive dividends when and if declared by the Board of Directors and are entitled to one vote per share on all matters submitted to a vote of the Shareholders. At December 31, 2015, the Company had 60 million shares of common stock reserved for issuance pursuant to Employee equity plans (of which 33 million shares had not been granted) through various share-based compensation arrangements. See Note 9 to the Consolidated Financial Statements for information regarding the Company's equity plans.

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STOCK PLANS

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK PLANS

STOCK PLANS

Share-based Compensation

The Company accounts for share-based compensation utilizing fair value, which is determined on the date of grant for all instruments. The Consolidated Statement of Income for the years ended December 31, 2015, 2014, and 2013, reflects share-based compensation expense of $29 million, $21 million, and $18 million, respectively. The total tax benefit recognized in earnings from share-based compensation arrangements for the years ended December 31, 2015, 2014, and 2013, was not material. As of December 31, 2015, there was $34 million of total unrecognized compensation cost related to share-based compensation arrangements, which is expected to be recognized over a weighted-average period of 1.9 years. The Company expects substantially all unvested awards to vest.

Restricted Stock Units and Stock Grants

Under the Company’s Amended and Restated 2007 Equity Incentive Plan (“2007 Equity Plan”), it granted restricted stock units (“RSUs”) to certain Employees during 2013, 2014, and 2015 and performance-based restricted stock units (“PBRSUs”) to certain Employees during 2014 and 2015. Outstanding RSUs vest over three years, subject generally to the individual’s continued employment or service. The Company recognizes all expense on a straight-line basis over the vesting period, with any changes in expense due to the number of PBRSUs expected to vest being modified on a prospective basis. The PBRSUs granted in May 2014 and February 2015 are subject to the Company’s performance with respect to a three-year simple average of Return on Invested Capital, before taxes and excluding special items ("ROIC"), for the defined performance period and the individual’s continued employment or service. The number of PBRSUs vesting on the vesting date will be interpolated based on the Company's ROIC performance and ranges from zero PBRSUs to 200 percent of granted PBRSUs.

Aggregated information regarding the Company’s RSUs and PBRSUs is summarized below:

	All Restricted Stock Units
	Units (000)			Wtd. Average Fair Value (per share)
Outstanding December 31, 2012, Unvested	2,876			$	9.57
Granted	1,139			14.34
Vested	(1,263	)		10.24
Surrendered	(168	)		9.11
Outstanding December 31, 2013	2,584			11.38
Granted	834		(a)	24.93
Vested	(1,239	)		11.05
Surrendered	(102	)		13.18
Outstanding December 31, 2014	2,077			16.92
Granted	561		(b)	45.80
Vested	(1,095	)		13.33
Surrendered	(58	)		25.49
Outstanding December 31, 2015, Unvested	1,485			$	30.17

(a) Includes 198 thousand shares of PBRSUs

(b) Includes 183 thousand shares of PBRSUs

In addition, the Company granted approximately 28 thousand shares of unrestricted stock at a weighted average grant price of $41.27 in 2015, approximately 36 thousand shares at a weighted average grant price of $24.91 in 2014, and approximately 63 thousand shares at a weighted average grant price of $14.34 in 2013, to members of its Board of Directors.

A remaining balance of up to 23 million shares of the Company’s common stock may be issued pursuant to grants under the 2007 Equity Plan.

Stock Options

The Company has stock options outstanding, which were granted prior to 2013, with an exercise price equal to the fair value of the Company’s common stock on the date of grant. The Company determined fair value of stock options using the Black-Scholes option valuation model. As of December 31, 2015, there were 822 thousand outstanding stock option awards, all of which are vested and exercisable, with a weighted average exercise price of $13.44.

Employee Stock Purchase Plan

Under the amended 1991 Employee Stock Purchase Plan (ESPP), which has been approved by Shareholders, the Company is authorized to issue up to a remaining balance of 10 million shares of the Company’s common stock to Employees of the Company. These shares may be issued at a price equal to 90 percent of the market value at the end of each monthly purchase period. Common stock purchases are paid for through periodic payroll deductions. For the years ended December 31, 2015, 2014, and 2013, participants under the plan purchased 597 thousand shares, 792 thousand shares, and 1.5 million shares at average prices of $36.40, $23.17, and $12.03, respectively. The weighted-average fair value of each purchase right under the ESPP granted for the years ended December 31, 2015, 2014, and 2013, which is equal to the ten percent discount from the market value of the Common Stock at the end of each monthly purchase period, was $4.04, $2.68, and $1.34, respectively.

Taxes

A portion of the Company’s granted options qualify as incentive stock options for income tax purposes. As such, a tax benefit is not recorded at the time the compensation cost related to the options is recorded for book purposes due to the fact that an incentive stock option does not ordinarily result in a tax benefit unless there is a disqualifying disposition. Grants of non-qualified stock options result in the creation of a deferred tax asset, which is a temporary difference, until the time that the option is exercised. Due to the treatment of incentive stock options for tax purposes, the Company’s effective tax rate from year to year is subject to variability.

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FINANCIAL DERIVATIVE INSTRUMENTS

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

FINANCIAL DERIVATIVE INSTRUMENTS

FINANCIAL DERIVATIVE INSTRUMENTS

Fuel Contracts

Airline operators are inherently dependent upon energy to operate and, therefore, are impacted by changes in jet fuel prices. Furthermore, jet fuel and oil typically represent one of the largest operating expenses for airlines. The Company endeavors to acquire jet fuel at the lowest possible cost and to reduce volatility in operating expenses through its fuel hedging program. Although the Company may periodically enter into jet fuel derivatives for short-term timeframes, because jet fuel is not widely traded on an organized futures exchange, there are limited opportunities to hedge directly in jet fuel for time horizons longer than approximately 24 months into the future. However, the Company has found that financial derivative instruments in other commodities, such as West Texas Intermediate (“WTI”) crude oil, Brent crude oil, and refined products, such as heating oil and unleaded gasoline, can be useful in decreasing its exposure to jet fuel price volatility. The Company does not purchase or hold any financial derivative instruments for trading or speculative purposes.

The Company has used financial derivative instruments for both short-term and long-term time frames, and primarily uses a mixture of purchased call options, collar structures (which include both a purchased call option and a sold put option), call spreads (which include a purchased call option and a sold call option), put spreads (which include a purchased put option and a sold put option), and fixed price swap agreements in its portfolio. Although the use of collar structures and swap agreements can reduce the overall cost of hedging, these instruments carry more risk than purchased call options in that the Company could end up in a liability position when the collar structure or swap agreement settles. With the use of purchased call options and call spreads, the Company cannot be in a liability position at settlement, but does not have coverage once market prices fall below the strike price of the purchased call option.

The Company evaluates its hedge volumes strictly from an “economic” standpoint and thus does not consider whether the hedges have qualified or will qualify for hedge accounting. The Company defines its “economic” hedge as the net volume of fuel derivative contracts held, including the impact of positions that have been offset through sold positions, regardless of whether those contracts qualify for hedge accounting. The level at which the Company is economically hedged for a particular period is also dependent on current market prices for that period, as well as the types of derivative instruments held and the strike prices of those instruments. For example, the Company may enter into “out-of-the-money” option contracts (including catastrophic protection), which may not generate intrinsic gains at settlement if market prices do not rise above the option strike price. Therefore, even though the Company may have an “economic” hedge in place for a particular period, that hedge may not produce any hedging gains at settlement and may even produce hedging losses depending on market prices, the types of instruments held, and the strike prices of those instruments.

For 2015, the Company had fuel derivative instruments in place for up to 15 percent of its fuel consumption. The Company also had fuel derivative instruments in place to provide coverage for up to 63 percent of its 2016 estimated fuel consumption, depending on where market prices settle. The following table provides information about the Company’s volume of fuel hedging for the years 2016 through 2018 on an “economic” basis considering current market prices:

	Fuel hedged as of
	December 31, 2015	Derivative underlying commodity type as of
Period (by year)	(gallons in millions) (a)	December 31, 2015
2016	1,226	Brent crude oil, Heating oil, and Gulf Coast jet fuel
2017	1,503	WTI crude and Brent crude oil
2018	731	Brent crude oil

(a) Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place and may vary significantly as market prices fluctuate.

Upon proper qualification, the Company accounts for its fuel derivative instruments as cash flow hedges. Generally, utilizing hedge accounting, all periodic changes in fair value of the derivatives designated as hedges that are considered to be effective are recorded in Accumulated other comprehensive income (loss) ("AOCI") until the underlying jet fuel is consumed. See Note 12. The Company’s results are subject to the possibility that periodic changes will not be effective, as defined, or that the derivatives will no longer qualify for hedge accounting. Ineffectiveness results when the change in the fair value of the derivative instrument exceeds the change in the value of the Company’s expected future cash outlay to purchase and consume jet fuel. To the extent that the periodic changes in the fair value of the derivatives are ineffective, the ineffective portion is recorded to Other (gains) losses, net, in the Consolidated Statement of Income. Likewise, if a hedge ceases to qualify for hedge accounting, any change in the fair value of derivative instruments since the last reporting period is recorded to Other (gains) losses, net, in the Consolidated Statement of Income in the period of the change; however, any amounts previously recorded to AOCI would remain there until such time as the original forecasted transaction occurs, at which time these amounts would be reclassified to Fuel and oil expense. When the Company has sold derivative positions in order to effectively “close” or offset a derivative already held as part of its fuel derivative instrument portfolio, any subsequent changes in fair value of those positions are marked to market through earnings. Likewise, any changes in fair value of those positions that were offset by entering into the sold positions and were de-designated as hedges are concurrently marked to market through earnings. However, any changes in value related to hedges that were deferred as part of AOCI while designated as a hedge would remain until the originally forecasted transaction occurs. In a situation where it becomes probable that a fuel hedged forecasted transaction will not occur, any gains and/or losses that have been recorded to AOCI would be required to be immediately reclassified into earnings. The Company did not have any such situations occur during 2013, 2014, or 2015.

In some situations, an entire commodity type used in hedging may cease to qualify for special hedge accounting treatment. As an example, from July 2013 to July 2015, the Company's routine statistical analysis performed to determine which commodities qualified for special hedge accounting treatment on a prospective basis dictated that WTI crude oil based derivatives no longer qualified for hedge accounting. This was primarily due to the fact that the correlation between WTI crude oil prices and jet fuel prices fell below established thresholds, and therefore the Company could no longer demonstrate that derivatives based on WTI crude oil prices would result in effective hedges on a prospective basis. As such, the changes in fair value of all of the Company's derivatives based in WTI were recorded directly to Other (gains) losses. The Company's routine statistical analysis performed during second half 2015, dictated that WTI crude oil based derivatives again qualified for hedge accounting.

Ineffectiveness is inherent in hedging jet fuel with derivative positions based in other crude oil related commodities. Due to the volatility in markets for crude oil and related products, the Company is unable to predict the amount of ineffectiveness each period, including the loss of hedge accounting, which could be determined on a derivative by derivative basis or in the aggregate for a specific commodity. This may result, and has resulted, in increased volatility in the Company’s financial results. Factors that have and may continue to lead to ineffectiveness and unrealized gains and losses on derivative contracts include: significant fluctuation in energy prices, the number of derivative positions the Company holds, significant weather events affecting refinery capacity and the production of refined products, and the volatility of the different types of products the Company uses in hedging. However, even though derivatives may not qualify for hedge accounting, the Company continues to hold the instruments as management believes derivative instruments continue to afford the Company the opportunity to stabilize jet fuel costs.

Accounting pronouncements pertaining to derivative instruments and hedging are complex with stringent requirements, including the documentation of a Company hedging strategy, statistical analysis to qualify a commodity for hedge accounting both on a historical and a prospective basis, and strict contemporaneous documentation that is required at the time each hedge is designated by the Company. The Company also examines the effectiveness of each individual hedge and its entire hedging program on a quarterly basis utilizing statistical analysis. This analysis involves utilizing regression and other statistical analyses that compare changes in the price of jet fuel to changes in the prices of the commodities used for hedging purposes.

All cash flows associated with purchasing and selling fuel derivatives are classified as Other operating cash flows in the Consolidated Statement of Cash Flows. The following table presents the location of all assets and liabilities associated with the Company’s hedging instruments within the Consolidated Balance Sheet:

		Asset derivatives				Liability derivatives
	Balance Sheet	Fair value at		Fair value at		Fair value at		Fair value at
(in millions)	location	12/31/2015		12/31/2014		12/31/2015		12/31/2014
Derivatives designated as hedges*
Fuel derivative contracts (gross)	Prepaid expenses and other current assets	$	2	$	—	$	—	$	—
Fuel derivative contracts (gross)	Other assets	2		—		—		—
Fuel derivative contracts (gross)	Accrued liabilities	107		—		526		—
Fuel derivative contracts (gross)	Other noncurrent liabilities	55		—		658		643
Interest rate derivative contracts	Other assets	2		13		—		—
Interest rate derivative contracts	Other noncurrent liabilities	—		—		49		61
Total derivatives designated as hedges		$	168	$	13	$	1,233	$	704
Derivatives not designated as hedges*
Fuel derivative contracts (gross)	Prepaid expenses and other current assets	$	39	$	—	$	26	$	—
Fuel derivative contracts (gross)	Other assets	5		—		—		—
Fuel derivative contracts (gross)	Accrued liabilities	1,395		1,190		1,854		1,432
Fuel derivative contracts (gross)	Other noncurrent liabilities	330		157		352		273
Total derivatives not designated as hedges		$	1,769	$	1,347	$	2,232	$	1,705
Total derivatives		$	1,937	$	1,360	$	3,465	$	2,409

* Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.

In addition, the Company also had the following amounts associated with fuel derivative instruments and hedging activities in its Consolidated Balance Sheet:

	Balance Sheet	December 31,		December 31,
(in millions)	location	2015		2014
Cash collateral deposits provided to counterparties for fuel   contracts - current	Offset against Accrued liabilities	$	235	$	68
Cash collateral deposits provided to counterparties for fuel   contracts- noncurrent	Offset against Other noncurrent liabilities	600		198
Due to third parties for fuel contracts	Accrued liabilities	46		16

All of the Company's fuel derivative instruments and interest rate swaps are subject to agreements that follow the netting guidance in the applicable accounting for derivatives and hedging. The types of derivative instruments the Company has determined are subject to netting requirements in the accompanying Consolidated Balance Sheet are those in which the Company pays or receives cash for transactions with the same counterparty and in the same currency via one net payment or receipt. For cash collateral held by the Company or provided to counterparties, the Company nets such amounts against the fair value of the Company's derivative portfolio by each counterparty. The Company has elected to utilize netting for both its fuel derivative instruments and interest rate swap agreements and also classifies such amounts as either current or noncurrent, based on the net fair value position with each of the Company's counterparties in the Consolidated Balance Sheet.

The Company's application of its netting policy associated with cash collateral differs depending on whether its derivative instruments are in a net asset position or a net liability position. If its fuel derivative instruments are in a net asset position with a counterparty, cash collateral amounts held are first netted against current outstanding derivative amounts associated with that counterparty until that balance is zero, and then any remainder is applied against the fair value of noncurrent outstanding derivative instruments. If the Company's fuel derivative instruments are in a net liability position with the counterparty, cash collateral amounts provided are first netted against noncurrent outstanding derivative amounts associated with that counterparty until that balance is zero, and then any remainder is applied against the fair value of current outstanding derivative instruments.

The Company has the following recognized financial assets and financial liabilities resulting from those transactions that meet the scope of the disclosure requirements as necessitated by applicable accounting guidance for balance sheet offsetting:

Offsetting of derivative assets
(in millions)
		(i)		(ii)			(iii) = (i) + (ii)		(i)		(ii)			(iii) = (i) + (ii)
		December 31, 2015							December 31, 2014
Description	Balance Sheet location	Gross amounts of recognized assets		Gross amounts offset in the Balance Sheet			Net amounts of assets presented in the Balance Sheet (a)		Gross amounts of recognized assets		Gross amounts offset in the Balance Sheet			Net amounts of assets presented in the Balance Sheet (a)
Fuel derivative contracts	Prepaid expenses and other current assets	$	41	$	(26	)	$	15	$	—	$	—		$	—
Fuel derivative contracts	Other assets	$	7	$	—		$	7	$	—	$	—		$	—
Fuel derivative contracts	Accrued liabilities	$	1,737	$	(1,737	)	$	—	$	1,258	$	(1,258	)	$	—
Fuel derivative contracts	Other noncurrent liabilities	$	985	$	(985	)	$	—	$	355	$	(355	)	$	—
Interest rate derivative contracts	Other assets	$	2	$	—		$	2	$	13	$	—		$	13

(a) The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

		(i)		(ii)			(iii) = (i) + (ii)		(i)		(ii)			(iii) = (i) + (ii)
		December 31, 2015							December 31, 2014
Description	Balance Sheet location	Gross amounts of recognized liabilities		Gross amounts offset in the Balance Sheet			Net amounts of liabilities presented in the Balance Sheet (a)		Gross amounts of recognized liabilities		Gross amounts offset in the Balance Sheet			Net amounts of liabilities presented in the Balance Sheet (a)
Fuel derivative contracts	Prepaid expenses and other current assets	$	26	$	(26	)	$	—	$	—	$	—		$	—
Fuel derivative contracts	Accrued liabilities	$	2,380	$	(1,737	)	$	643	$	1,432	$	(1,258	)	$	174
Fuel derivative contracts	Other noncurrent liabilities	$	1,010	$	(985	)	$	25	$	916	$	(355	)	$	561
Interest rate derivative contracts	Other noncurrent liabilities	$	49	$	—		$	49	$	61	$	—		$	61

(a) The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

The following tables present the impact of derivative instruments and their location within the Consolidated Statement of Income for the year endedDecember 31, 2015 and 2014:

Derivatives in cash flow hedging relationships
	(Gain) loss recognized in AOCI on derivatives (effective portion)						(Gain) loss reclassified from AOCI into income (effective portion)(a)						(Gain) loss recognized in income on derivatives (ineffective portion)(b)
	Year ended						Year ended						Year ended
	December 31,						December 31,						December 31,
(in millions)	2015			2014			2015			2014			2015			2014
Fuel derivative contracts	$	546	*	$	749	*	$	238	*	$	22	*	$	(9	)	$	7
Interest rate derivatives	4		*	6		*	13		*	14		*	(4		)	(4		)
Total	$	550		$	755		$	251		$	36		$	(13	)	$	3

*Net of tax

(a) Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.

(b) Amounts are included in Other (gains) losses, net.

Derivatives not in cash flow hedging relationships
	(Gain) loss
	recognized in income on
	derivatives
	Year ended				Location of (gain) loss
	December 31,				recognized in income
(in millions)	2015		2014		on derivatives
Fuel derivative contracts	$	444	$	244	Other (gains) losses, net

The Company also recorded expense associated with premiums paid for fuel derivative contracts that settled/expired during 2015, 2014, and 2013 of $124 million, $62 million, and $60 million, respectively. These amounts are excluded from the Company’s measurement of effectiveness for related hedges and are included as a component of Other (gains) losses, net, in the Consolidated Statement of Income.

The fair values of the derivative instruments, depending on the type of instrument, were determined by the use of present value methods or option value models with assumptions about commodity prices based on those observed in underlying markets or provided by third parties. Included in the Company’s cumulative net unrealized losses from fuel hedges as of December 31, 2015, recorded in AOCI, were approximately $620 million in unrealized losses, net of taxes, which are expected to be realized in earnings during the twelve months subsequent to December 31, 2015.

Interest Rate Swaps

The Company is party to certain interest rate swap agreements that are accounted for as either fair value hedges or cash flow hedges, as defined in the applicable accounting guidance for derivative instruments and hedging. Several of the Company's interest rate swap agreements qualify for the “shortcut” method of accounting for hedges, which dictates that the hedges are assumed to be perfectly effective, and, thus, there is no ineffectiveness to be recorded in earnings. For the Company’s interest rate swap agreements that do not qualify for the "shortcut" method of accounting, ineffectiveness is required to be measured at each reporting period. The ineffectiveness associated with all of the Company’s, including AirTran Holdings', interest rate swap agreements for all periods presented was not material.

The Company has floating-to-fixed interest rate swap agreements associated with its $600 million floating-rate term loan agreement due 2020 and its $332 million term loan agreement due 2019 that are accounted for as cash flow hedges. These interest rate hedges have fixed the interest rate on the $600 million floating-rate term loan agreement at 5.223 percent until maturity, and for the $332 million term loan agreement at 6.315 percent until maturity.

The fair values of the interest rate swap agreements, which are adjusted regularly, have been aggregated by counterparty for classification in the Consolidated Balance Sheet. Agreements totaling an asset of $2 million are fair value hedges and are classified as a component of Other assets. The corresponding adjustment related to the net asset associated with the Company’s fair value hedges is to the carrying value of the long-term debt. Agreements totaling a net liability of $49 million are fair value hedges and cash flow hedges and are classified as a component of Other noncurrent liabilities. The corresponding adjustment related to the net liability associated with the Company’s cash flow hedges is to AOCI and fair value hedges is to the carrying value of the long-term debt. See Note 12.

There are also a number of interest rate swap agreements, which convert a portion of AirTran Holdings' floating-rate debt to a fixed-rate basis for the remaining life of the debt, thus reducing the impact of interest rate changes on future interest expense and cash flows. Under these agreements, which expire between 2016 and 2020, it pays fixed rates between 4.35 percent and 6.435 percent and receives either three-month or six-month LIBOR on the notional values. The notional amount of outstanding debt related to interest rate swaps as of December 31, 2015, was $208 million. These interest rate swap arrangements were designated as cash flow hedges as of the acquisition date. The ineffectiveness associated with all of the Company’s interest rate cash flow hedges for all periods presented was not material.

During 2015, the Company terminated the fixed-to-floating interest rate swap agreements related to its$300 million5.75% unsecured notes due 2016. The effect of this termination is such that the interest associated with the debt prospectively reverts back to its original fixed rate. As a result of the approximate $12 million gain realized on this transaction, which will be amortized over the remaining term of the corresponding unsecured notes, and based on projected interest rates at the date of termination, the Company does not believe its future interest expense associated with these unsecured notes will significantly differ from the expense it would have recorded had the unsecured notes remained at floating rates.

During fourth quarter 2015, the Company entered into an interest rate swap agreement related to its $500 million2.65% Notes due 2020. The primary objective for the Company's use of this interest rate hedge was to reduce the volatility of net interest expense by better matching the repricing of its assets and liabilities. Under this interest rate swap agreement, the Company pays LIBOR plus a margin every six months on the notional amount of the debt, and receives payments based on the fixed stated rate of the notes every six months until the date the notes become due. This interest rate swap agreement qualifies as a fair value hedge. As a result of the fixed-to-floating interest rate swap agreement in place, the average floating rate recognized during 2015 was approximately 1.94 percent, based on actual and forward rates as of December 31, 2015.

The Company also has fixed-to-floating interest rate swap agreements in place associated with its $300 million2.75% Notes due 2019 that are accounted for as fair value hedges. As a result of the fixed-to-floating interest rate swap agreements in place, the average floating rate recognized during 2015 was approximately 1.27 percent, based on actual and forward rates as of December 31, 2015.

Credit Risk and Collateral

Credit exposure related to fuel derivative instruments is represented by the fair value of contracts that are an asset to the Company at the reporting date. At such times, these outstanding instruments expose the Company to credit loss in the event of nonperformance by the counterparties to the agreements. However, the Company has not experienced any significant credit loss as a result of counterparty nonperformance in the past. To manage credit risk, the Company selects and periodically reviews counterparties based on credit ratings, limits its exposure with respect to each counterparty, and monitors the market position of the fuel hedging program and its relative market position with each counterparty. At December 31, 2015, the Company had agreements with all of its active counterparties containing early termination rights and/or bilateral collateral provisions whereby security is required if market risk exposure exceeds a specified threshold amount based on the counterparty credit rating. The Company also had agreements with counterparties in which cash deposits, letters of credit, and/or pledged aircraft are required to be posted whenever the net fair value of derivatives associated with those counterparties exceeds specific thresholds. The following table provides the fair values of fuel derivatives, amounts posted as collateral, and applicable collateral posting threshold amounts as of December 31, 2015, at which such postings are triggered:

	Counterparty (CP)
(in millions)	A			B			C			D			E			F		Other(a)		Total
Fair value of fuel derivatives	$	(562	)	$	(201	)	$	(176	)	$	(411	)	$	(159	)	$	20	$	8	$	(1,481	)
Cash collateral held (by) CP	(284		)	(159		)	(56		)	(299		)	(37		)	—		—		(835		)
Aircraft collateral pledged to CP	(250		)	—			—			—			—			—		—		(250		)
Letters of credit (LC)	—			—			—			—			—			—		—		—
Option to substitute LC for aircraft	(200) to (600)(h)			(100) to (500)(d)			N/A			(150) to (550)(d)			(150) to (550)(d)			N/A
Option to substitute LC for cash	N/A			>(500)(e)			(225) to (275)(e)			(75) to (150) or >(550)(e)			(125) to (150) or >(550)(e)			(g)
If credit rating is investment grade, fair value of fuel derivative level at which:
Cash is provided to CP	(50) to (200) or >(600)			(50) to (100) or >(500)			>(125)			(75) to (150) or >(550)			(125) to (150) or >(550)			>(100)
Cash is received from CP	>50			>150			>175(c)			>250			>75			>0
Aircraft or cash can be pledged to   CP as collateral	(200) to (600)(f)			(100) to (500)(d)			N/A			(150) to (550)(d)			(150) to (550)(d)			N/A
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Cash is provided to CP	(0) to (200) or >(600)			(0) to (100) or >(500)			(b)			(0) to (150) or >(550)			(0) to (150) or >(550)			(b)
Cash is received from CP	(b)			(b)			(b)			(b)			(b)			(b)
Aircraft or cash can be pledged to   CP as collateral	(200) to (600)			(100) to (500)			N/A			(150) to (550)			(150) to (550)			N/A

(a) Individual counterparties with fair value of fuel derivatives <$10 million.

(b) Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.

(c) Thresholds may vary based on changes in credit ratings within investment grade.

(d) The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.

(e) The Company has the option of providing cash or letters of credit as collateral.

(f) The Company has the option of providing cash or pledging aircraft as collateral.

(g) The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.

(h) The Company has the option of providing letters of credit in addition to aircraft collateral if the appraised value of the aircraft does not meet the collateral requirement.

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FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

As of December 31, 2015, the Company held certain items that are required to be measured at fair value on a recurring basis. These included cash equivalents, short-term investments (primarily treasury bills and certificates of deposit), interest rate derivative contracts, fuel derivative contracts, and available-for-sale securities. The majority of the Company’s short-term investments consist of instruments classified as Level 1. However, the Company has certificates of deposit, commercial paper, and Eurodollar time deposits that are classified as Level 2, due to the fact that the fair value for these instruments is determined utilizing observable inputs in non-active markets. Other available-for-sale securities primarily consist of investments associated with the Company’s excess benefit plan.

The Company’s fuel and interest rate derivative instruments consist of over-the-counter contracts, which are not traded on a public exchange. Fuel derivative instruments include swaps, as well as different types of option contracts, whereas interest rate derivatives consist solely of swap agreements. See Note 10 for further information on the Company’s derivative instruments and hedging activities. The fair values of swap contracts 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 has categorized these swap contracts as Level 2. The Company’s Treasury Department, which reports to the Chief Financial Officer, determines the value of option contracts utilizing an option pricing model based on inputs that are either readily available in public markets, can be derived from information available in publicly quoted markets, or are provided by financial institutions that trade these contracts. The option pricing model used by the Company is an industry standard model for valuing options and is the same model used by the broker/dealer community (i.e., the Company’s counterparties). The inputs to this option pricing model are the option strike price, underlying price, risk free rate of interest, time to expiration, and volatility. Because certain inputs used to determine the fair value of option contracts are unobservable (principally implied volatility), the Company has categorized these option contracts as Level 3. Volatility information is obtained from external sources, but is analyzed by the Company for reasonableness and compared to similar information received from other external sources. The fair value of option contracts considers both the intrinsic value and any remaining time value associated with those derivatives that have not yet settled. The Company also considers counterparty credit risk and its own credit risk in its determination of all estimated fair values. To validate the reasonableness of the Company’s option pricing model, on a monthly basis, the Company compares its option valuations to third party valuations. If any significant differences were to be noted, they would be researched in order to determine the reason. However, historically, no significant differences have been noted. 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.

Included in Other available-for-sale securities are the Company's investments associated with its excess benefit plan which consist of mutual funds that are publicly traded and for which market prices are readily available. This plan is a non-qualified deferred compensation plan designed to hold Employee contributions in excess of limits established by Section 415 of the Internal Revenue Code of 1986, as amended. Payments under this plan are made based on the participant's distribution election and plan balance. Assets related to the funded portion of the deferred compensation plan are held in a rabbi trust, and the Company remains liable to these participants for the unfunded portion of the plan. The Company records changes in the fair value of the asset in the Company's earnings.

The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis at December 31, 2015, and December 31, 2014:

				Fair value measurements at reporting date using:
				Quoted prices in active markets for identical assets		Significant other observable inputs			Significant unobservable inputs
Description	December 31, 2015			(Level 1)		(Level 2)			(Level 3)
Assets	(in millions)
Cash equivalents
Cash equivalents (a)	$	1,337		$	1,337	$	—		$	—
Commercial paper	200			—		200			—
Certificates of deposit	13			—		13			—
Eurodollar Time Deposits	33			—		33			—
Short-term investments:
Treasury bills	1,248			1,248		—			—
Certificates of deposit	220			—		220			—
Interest rate derivatives (see Note 10)	2			—		2			—
Fuel derivatives:
Swap contracts (b)	38			—		38			—
Swap contracts (c)	931			—		931			—
Option contracts (b)	10			—		—			10
Option contracts (c)	956			—		—			956
Other available-for-sale securities	93			66		—			27
Total assets	$	5,081		$	2,651	$	1,437		$	993
Liabilities
Fuel derivatives:
Swap contracts (c)	$	(774	)	$	—	$	(774	)	$	—
Option contracts (b)	(26		)	—		—			(26		)
Option contracts (c)	(2,616		)	—		—			(2,616		)
Interest rate derivatives (see Note 10)	(49		)	—		(49		)	—
Total liabilities	$	(3,465	)	$	—	$	(823	)	$	(2,642	)

(a) Cash equivalents are primarily composed of money market investments.

(b) In the Consolidated Balance Sheet amounts are presented as a net asset. See Note 10.

(c) In the Consolidated Balance Sheet amounts are presented as a net liability. See Note 10.

				Fair value measurements at reporting date using:
				Quoted prices in active markets for identical assets		Significant other observable inputs			Significant unobservable inputs
Description	December 31, 2014			(Level 1)		(Level 2)			(Level 3)
Assets	(in millions)
Cash equivalents
Cash equivalents (a)	$	1,110		$	1,110	$	—		$	—
Commercial paper	70			—		70			—
Certificates of deposit	4			—		4			—
Eurodollar Time Deposits	98			—		98			—
Short-term investments:
Treasury bills	1,450			1,450		—			—
Certificates of deposit	256			—		256			—
Interest rate derivatives (see Note 10)	13			—		13			—
Fuel derivatives:
Swap contracts (b)	455			—		455			—
Option contracts (b)	892			—		—			892
Other available-for-sale securities	95			63		—			32
Total assets	$	4,443		$	2,623	$	896		$	924
Liabilities
Fuel derivatives:
Swap contracts (b)	$	(365	)	$	—	$	(365	)	$	—
Option contracts (b)	(1,983		)	—		—			(1,983		)
Interest rate derivatives (see Note 10)	(61		)	—		(61		)	—
Total liabilities	$	(2,409	)	$	—	$	(426	)	$	(1,983	)

(a) Cash equivalents are primarily composed of money market investments.

(b) In the Consolidated Balance Sheet amounts are presented as a net liability. See Note 10.

The Company had no transfers of assets or liabilities between any of the above levels during the years ended December 31, 2015 or 2014. The Company did not have any assets or liabilities measured at fair value on a nonrecurring basis as of December 31, 2015 or 2014. The following tables present the Company’s activity for items measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for 2015 and 2014:

	Fair value measurements using significant unobservable inputs (Level 3)
	Fuel				Other
(in millions)	derivatives				securities			Total
Balance at December 31, 2014	$	(1,091	)		$	32		$	(1,059	)
Total losses (realized or unrealized)
Included in earnings	(646		)		(1		)	(647		)
Included in other comprehensive income	(858		)		—			(858		)
Purchases	750			(a)	—			750
Sales	(196		)	(a)	(4		)	(200		)
Settlements	365				—			365
Balance at December 31, 2015	$	(1,676	)		$	27		$	(1,649	)
The amount of total losses for the period   included in earnings attributable to the   change in unrealized gains or losses relating   to assets still held at December 31, 2015	$	(428	)		$	—		$	(428	)

(a) The purchase and sale of fuel derivatives are recorded gross based on the structure of the derivative instrument and

whether a contract with multiple derivatives is purchased as a single instrument or separate instruments.

	Fair value measurements using significant unobservable inputs (Level 3)
	Fuel				Other
(in millions)	derivatives				securities			Total
Balance at December 31, 2013	$	172			$	44		$	216
Total gains or (losses) (realized or unrealized)
Included in earnings	(439		)		—			(439		)
Included in other comprehensive income	(1,091		)		3			(1,088		)
Purchases	403			(a)	—			403
Sales	(155		)	(a)	(15		)	(170		)
Settlements	19				—			19
Balance at December 31, 2014	$	(1,091	)		$	32		$	(1,059	)
The amount of total losses for the period   included in earnings attributable to the   change in unrealized gains or losses relating   to assets still held at December 31, 2014	$	(450	)		$	—		$	(450	)

(a) The purchase and sale of fuel derivatives are recorded gross based on the structure of the derivative instrument and

whether a contract with multiple derivatives is purchased as a single instrument or separate instruments.

The significant unobservable input used in the fair value measurement of the Company’s derivative option contracts is implied volatility. Holding other inputs constant, a significant increase (decrease) in implied volatility would result in a significantly higher (lower) fair value measurement, respectively, for the Company’s derivative option contracts.

The following table presents a range of the unobservable inputs utilized in the fair value measurements of the Company’s fuel derivatives classified as Level 3 at December 31, 2015:

Quantitative information about Level 3 fair value measurements
	Valuation technique	Unobservable input	Period (by year)	Range
Fuel derivatives	Option model	Implied volatility	2016	26-47%
			2017	25-37%
			2018	16-31%

The carrying amounts and estimated fair values of the Company’s long-term debt (including current maturities), as well as the applicable fair value hierarchy tier, at December 31, 2015, are presented in the table below. The fair values of the Company’s publicly held long-term debt 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 has categorized these agreements as Level 2. Six of the Company’s debt agreements are not publicly held. The Company has determined the estimated fair value of this debt to be Level 3, as certain inputs used to determine the fair value of these agreements are unobservable. The Company utilizes indicative pricing from counterparties and a discounted cash flow method to estimate the fair value of the Level 3 items.

(in millions)	Carrying value		Estimated fair value		Fair value level hierarchy
5.75% Notes due 2016	$	307	$	319	Level 2
5.25% Convertible Senior Notes due 2016	111		324		Level 2
5.125% Notes due 2017	309		321		Level 2
French Credit Agreements due 2018 - 1.53%	25		25		Level 3
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02%	17		17		Level 3
2.75% Notes due 2019	303		307		Level 2
Term Loan Agreement due 2019 - 6.315%	143		147		Level 3
Term Loan Agreement due 2019 - 4.84%	36		37		Level 3
2.65% Notes due 2020	494		493		Level 2
Term Loan Agreement due 2020 - 5.223%	329		323		Level 3
Floating-rate 737 Aircraft Notes payable through 2020	257		253		Level 3
Pass Through Certificates due 2022 - 6.24%	340		382		Level 2
7.375% Debentures due 2027	132		154		Level 2

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

Comprehensive income includes changes in the fair value of certain financial derivative instruments that qualify for hedge accounting, unrealized gains and losses on certain investments, and actuarial gains/losses arising from the Company’s postretirement benefit obligation. A rollforward of the amounts included in AOCI, net of taxes, is shown below for 2015 and 2014:

(in millions)	Fuel derivatives			Interest rate derivatives			Defined benefit plan items			Other			Deferred tax impact		Accumulated other comprehensive income (loss)
Balance at December 31, 2013	$	(20	)	$	(58	)	$	65		$	8		$	2	$	(3	)
Changes in fair value	(1,191		)	(10		)	(24		)	—			454		(771		)
Reclassification to earnings	34			23			—			—			(21)		36
Balance at December 31, 2014	$	(1,177	)	$	(45	)	$	41		$	8		$	435	$	(738	)
Changes in fair value	(867		)	(5		)	(19		)	(2		)	329		(564		)
Reclassification to earnings	378			20			—			—			(147)		251
Balance at December 31, 2015	$	(1,666	)	$	(30	)	$	22		$	6		$	617	$	(1,051	)

The following table illustrates the significant amounts reclassified out of each component of AOCI for the year endedDecember 31, 2015:

Year ended December 31, 2015
(in millions)	Amounts reclassified from AOCI		Affected line item in the Consolidated Statement of Comprehensive Income
AOCI components
Unrealized loss on fuel derivative instruments	$	378	Fuel and oil expense
	140		Less: Tax expense
	$	238	Net of tax
Unrealized loss on interest rate derivative instruments	$	20	Interest expense
	7		Less: Tax expense
	$	13	Net of tax
Total reclassifications for the period	$	251	Net of tax

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EMPLOYEE RETIREMENT PLANS

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

EMPLOYEE RETIREMENT PLANS

EMPLOYEE RETIREMENT PLANS

Defined Contribution Plans

Southwest has defined contribution plans covering substantially all of its Employees. Contributions under all defined contribution plans are primarily based on Employee compensation and performance of the Company. The Company sponsors Employee savings plans under section 401(k) of the Internal Revenue Code of 1986, as amended, which include Company matching contributions. In addition, the Southwest Airlines Co. ProfitSharing Plan (ProfitSharing Plan) is a defined contribution plan to which the Company may contribute a percentage of its eligible pre-tax profits, as defined, on an annual basis. No Employee contributions to the ProfitSharing Plan are allowed.

Company contributions to all defined contribution plans expensed in 2015, 2014, and 2013, reflected as a component of Salaries, wages, and benefits, were $945 million, $644 million, and $497 million, respectively.

Postretirement Benefit Plans

The Company provides postretirement benefits to qualified retirees in the form of medical and dental coverage. Employees must meet minimum levels of service and age requirements as set forth by the Company, or as specified in collective-bargaining agreements with specific workgroups. Employees meeting these requirements, as defined, may use accrued unused sick time to pay for medical and dental premiums from the age of retirement until age 65.

The following table shows the change in the accumulated postretirement benefit obligation (APBO) for the years ended December 31, 2015 and 2014:

(in millions)	2015			2014
APBO at beginning of period	$	169		$	138
Service cost	11			10
Interest cost	7			7
Benefits paid	(6		)	(4		)
Actuarial loss	20			21
Settlements	$	—		$	(3	)
APBO at end of period	$	201		$	169

All plans are unfunded, and benefits are paid as they become due. Estimated future benefit payments expected to be paid are $5 million in 2016, $6 million in 2017, $7 million in 2018, $8 million in 2019, $9 million in 2020, and $71 million for the next five years thereafter.

The funded status (the difference between the fair value of plan assets and the projected benefit obligations) of the Company’s consolidated benefit plans are recognized in the Consolidated Balance Sheet, with a corresponding adjustment to AOCI. The following table reconciles the funded status of the plans to the accrued postretirement benefit cost recognized in Other non-current liabilities on the Company’s Consolidated Balance Sheet at December 31, 2015 and 2014.

(in millions)	2015			2014
Funded status	$	(201	)	$	(169	)
Unrecognized net actuarial gain	(31		)	(53		)
Unrecognized prior service cost	9			12
Accumulated other comprehensive income	22			41
Cost recognized on Consolidated Balance Sheet	$	(201	)	$	(169	)

The consolidated periodic postretirement benefit cost for the years ended December 31, 2015, 2014, and 2013, included the following:

(in millions)	2015			2014			2013
Service cost	$	11		$	10		$	30
Interest cost	7			7			4
Amortization of prior service cost	3			3			3
Recognized actuarial gain	(3		)	(4		)	(4		)
Settlements	$	—		$	(1	)	$	—
Net periodic postretirement benefit cost	$	18		$	15		$	33

Unrecognized prior service cost is expensed using a straight-line amortization of the cost over the average future service of Employees expected to receive benefits under the plans. Actuarial gains are amortized utilizing the minimum amortization method. The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31,2015, 2014, and 2013:

	2015		2014		2013
Weighted-average discount rate	4.50	%	4.10	%	5.05	%
Assumed healthcare cost trend rate (1)	7.08	%	6.88	%	7.50	%

(1) The assumed healthcare cost trend rate is assumed to remain at 7.08% for 2016, then decline gradually to 5.19% by 2026 and remain level thereafter.

The assumed healthcare cost trend rates have a significant effect on the amounts reported for the consolidated postretirement plans. A one percent change in all healthcare cost trend rates used in measuring the APBO at December 31, 2015, would have the following effects:

(in millions)	1% increase		1% decrease
Increase (decrease) in total service and interest costs	$	3	$	(2	)
Increase (decrease) in the APBO	$	29	$	(24	)

The selection of a discount rate is made annually and is selected by the Company based upon comparison of the expected future cash flows associated with the Company’s future payments under its consolidated postretirement obligations to a yield curve created using high quality bonds that closely match those expected future cash flows. This rate increased during 2015 due to market conditions. The assumed healthcare trend rate is also reviewed at least annually and is determined based upon both historical experience with the Company’s healthcare benefits paid and expectations of how those trends may or may not change in future years.

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INCOME TAXES

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The components of deferred tax assets and liabilities at December 31, 2015 and 2014, are as follows:

(in millions)	2015		2014
DEFERRED TAX LIABILITIES:
Accelerated depreciation	$	4,429	$	4,277
Other	62		51
Total deferred tax liabilities	4,491		4,328
DEFERRED TAX ASSETS:
Fuel derivative instruments	750		521
Capital and operating leases	81		125
Construction obligation	289		209
Accrued engine maintenance	74		83
Accrued employee benefits	541		334
State taxes	62		65
Business partner income	107		90
Other	97		119
Total deferred tax assets	2,001		1,546
Net deferred tax liability	$	2,490	$	2,782

The provision for income taxes is composed of the following:

(in millions)	2015			2014		2013
CURRENT:
Federal	$	1,292		$	203	$	355
State	114			29		44
Total current	1,406			232		399
DEFERRED:
Federal	(97		)	421		62
State	(11		)	27		(6		)
Total deferred	(108		)	448		56
	$	1,298		$	680	$	455

The effective tax rate on income before income taxes differed from the federal income tax statutory rate for the following reasons:

(in millions)	2015			2014			2013
Tax at statutory U.S. tax rates	$	1,218		$	636		$	423
Nondeductible items	15			9			10
State income taxes, net of federal benefit	66			37			25
Other, net	(1		)	(2		)	(3		)
Total income tax provision	$	1,298		$	680		$	455

The only periods subject to examination for the Company’s federal tax return are the 2014 and 2015 tax years.

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QUARTERLY FINANCIAL DATA

12 Months Ended

Dec. 31, 2015

Quarterly Financial Data [Abstract]

QUARTERLY FINANCIAL DATA

QUARTERLY FINANCIAL DATA

(unaudited)

	Three months ended
(in millions except per share amounts)	March 31		June 30		Sept. 30		Dec. 31
2015
Operating revenues (a)(b)	$	4,414	$	5,111	$	5,318	$	4,977
Operating income	780		1,085		1,225		1,026
Income before income taxes	723		977		933		847
Net income	453		608		584		536
Net income per share, basic (a)(b)	0.67		0.91		0.89		0.83
Net income per share, diluted (a)(b)	0.66		0.90		0.88		0.82
	March 31		June 30		Sept. 30		Dec. 31
2014
Operating revenues (a)	$	4,166	$	5,011	$	4,800	$	4,628
Operating income	215		775		614		621
Income before income taxes	244		746		525		302
Net income	152		465		329		190
Net income per share, basic (a)	0.22		0.67		0.48		0.28
Net income per share, diluted (a)	0.22		0.67		0.48		0.28

(a) Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $43 million, $41 million, and $30 million, and increased both Basic and Diluted net income per share by approximately $.03, $.03, and $.02 for first, second, and third quarters of 2015, respectively. Also, as a result, fourth quarter 2014 Passenger revenues increased by approximately $55 million and both Basic and Diluted net income per share for the period increased by $.04. See Note 1 for further detail.

(b) Includes the impact of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The impact of this change during third quarter and fourth quarter 2015 resulted in increases to Operating revenue of approximately $303 million and $124 million, and increased both Basic and Diluted net income per share by approximately $.24 and $.10, respectively. See Note 1 for further detail.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

Southwest Airlines Co. (the “Company”) operates Southwest Airlines, a major domestic airline. The Consolidated Financial Statements include the accounts of the Company and its wholly owned subsidiaries, which include AirTran Holdings, LLC. On May 2, 2011 (the “acquisition date”), the Company acquired all of the outstanding equity of AirTran Holdings, Inc. (“AirTran Holdings”), the former parent company of AirTran Airways, Inc. (“AirTran Airways”). Throughout these Notes, the Company makes reference to AirTran, which is meant to be inclusive of AirTran Holdings, LLC, the successor to AirTran Holdings, and its subsidiaries, including among others, AirTran Airways. AirTran's final passenger service was on December 28, 2014. Although the vast majority of integration costs were incurred in periods prior to 2015, the Company incurred some additional costs in 2015 associated with the integration of AirTran, and those costs are included in Acquisition and integration costs in the accompanying Consolidated Statement of Comprehensive Income. See Note 7 for further information. The accompanying Consolidated Financial Statements include the results of operations and cash flows for all periods presented and all significant inter-entity balances and transactions have been eliminated. The preparation of financial statements in conformity with generally accepted accounting principles in the United States (GAAP) requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from these estimates.

On November 20, 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2015-17, Balance Sheet Classification of Deferred Taxes. The standard amends the current requirement for organizations to present deferred tax liabilities and assets as current and noncurrent in a classified balance sheet. Instead, organizations will now be required to classify all deferred tax assets and liabilities as noncurrent. The ASU is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, with early adoption permitted. The Company early adopted this standard during fourth quarter 2015, utilizing retrospective application as permitted. As such, certain prior period amounts have been reclassified to conform to the current presentation. In the Consolidated Balance Sheet as of December 31, 2014, the Company reclassified $477 million from current Deferred income tax assets to reduce Deferred income taxes within non-current liabilities.

Cash and cash equivalents

Cash and Cash Equivalents

Cash in excess of that necessary for operating requirements is invested in short-term, highly liquid, income-producing investments. Investments with original maturities of three months or less when purchased are classified as cash and cash equivalents, which primarily consists of certificates of deposit, money market funds, and investment grade commercial paper issued by major corporations and financial institutions. Cash and cash equivalents are stated at cost, which approximates fair value.

As of December 31, 2015, $835 millionin cash collateral deposits were provided by the Company to its fuel hedge counterparties and no cash collateral deposits were held by or provided by the Company to its interest rate hedge counterparties. As of December 31, 2014, $266 million in cash collateral deposits were provided by the Company to its fuel hedge counterparties and no cash collateral deposits were held by or provided by the Company to its interest rate hedge counterparties. Cash collateral amounts provided or held associated with fuel and interest rate derivative instruments are not restricted in any way and earn interest income at an agreed upon rate that approximates the rates earned on short-term securities issued by the U.S. Government. Depending on the fair value of the Company’s fuel and interest rate derivative instruments, the amounts of collateral deposits held or provided at any point in time can fluctuate significantly. See Note 10 for further information on these collateral deposits and fuel derivative instruments.

Short-term and noncurrent investments

Short-term and Noncurrent Investments

Short-term investments consist of investments with original maturities of greater than three months but less than twelve months when purchased. These are primarily short-term securities issued by the U.S. Government and certificates of deposit issued by domestic banks. All of these investments are classified as available-for-sale securities and are stated at fair value, which approximates cost. For all short-term investments, at each reset period or upon reinvestment, the Company accounts for the transaction as Proceeds from sales of short-term investments for the security relinquished, and Purchases of short-investments for the security purchased, in the accompanying Consolidated Statement of Cash Flows. Unrealized gains and losses, net of tax, if any, are recognized in Accumulated other comprehensive income (loss) (“AOCI”) in the accompanying Consolidated Balance Sheet. Realized net gains and losses on specific investments, if any, are reflected in Interest income in the accompanying Consolidated Statement of Income. Both unrealized and realized gains and/or losses associated with investments were immaterial for all years presented.

Noncurrent investments consist of investments with maturities of greater than twelve months. Noncurrent investments are included as a component of Other assets in the Consolidated Balance Sheet.

Accounts and other receivables

Accounts and Other Receivables

Accounts and other receivables are carried at cost. They primarily consist of amounts due from credit card companies associated with sales of tickets for future travel, and amounts due from business partners in the Company’s frequent flyer program. The allowance for doubtful accounts was immaterial at December 31, 2015 and 2014. In addition, the provision for doubtful accounts and write-offs for 2015, 2014, and 2013 were each immaterial.

Inventories

Inventories

Inventories primarily consist of aircraft fuel, flight equipment expendable parts, materials, and supplies. All of these items are carried at average cost, less an allowance for obsolescence. These items are generally charged to expense when issued for use. The reserve for obsolescence was $47 million and $46 million at December 31, 2015, and 2014, respectively. In addition, the Company’s provision for obsolescence and write-offs for 2015, 2014, and 2013 were each immaterial.

Property and equipment

Property and Equipment

Property and equipment is stated at cost. Capital expenditures includes payments made for aircraft, other flight equipment, purchase deposits related to future aircraft deliveries, and ground and other property and equipment. Depreciation is provided by the straight-line method to estimated residual values over periods generally ranging from 23 to 25 years for flight equipment, 5 to 30 years for ground property and equipment once the asset is placed in service, and 25 to 30 years for Assets constructed for others. Residual values estimated for aircraft generally range from 2 to 20 percent, for ground property and equipment generally range from 0 to 10 percent, and for Assets constructed for others range from 17 to 25 percent. Property under capital leases and related obligations are initially recorded at an amount equal to the present value of future minimum lease payments computed on the basis of 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. Leasehold improvements generally are amortized on a straight-line basis over the shorter of the estimated useful life of the improvement or the remaining term of the lease. Assets constructed for others primarily consists of airport improvement projects, once placed into service, in which the Company is considered the accounting owner of the facilities, and such assets are amortized to estimated residual value over the term of the Company's lease or the expected life of the asset. See Note 4 for further information.

Based on a revision of the Company's future firm aircraft order book with Boeing at the end of December 2015, the Company changed the estimated retirement dates of many of its owned 737-300 and 737-500 aircraft. Previously, this fleet was estimated to retire by mid-2021; however, pursuant to this change, the fleet and related parts are expected to be retired by mid-2018. See Note 4 for further information on the Company's future firm aircraft deliveries. This change in retirement dates is considered a change in estimate. It has been accounted for on a prospective basis, and thus the Company will record accelerated depreciation expense over the remainder of the useful lives for each aircraft and its related parts. The impact of this change on the year ended December 31, 2015 was immaterial. The impact of this change in estimate in 2016 is an approximate $89 million increase to Depreciation and amortization expense.

The Company evaluates its long-lived assets used in operations for impairment when events and circumstances indicate that the undiscounted cash flows to be generated by that asset are less than the carrying amounts of the asset and may not be recoverable. Factors that would indicate potential impairment include, but are not limited to, significant decreases in the market value of the long-lived asset(s), a significant change in the long-lived asset’s physical condition, and operating or cash flow losses associated with the use of the long-lived asset. If an asset is deemed to be impaired, an impairment loss is recorded for the excess of the asset book value in relation to its estimated fair value.

Aircraft and engine maintenance

Aircraft and Engine Maintenance

The cost of scheduled inspections and repairs and routine maintenance costs for all aircraft and engines are charged to Maintenance materials and repairs expense as incurred. The Company also has “power-by-the-hour” agreements related to certain of its aircraft engines with external service providers. Under these agreements, which the Company has determined effectively transfer the risk and create an obligation associated with the maintenance on such engines to the counterparty, expense is recorded commensurate with each hour flown on an engine. In situations where the payments to the counterparty do not sufficiently match the level of services received during the period, expense is recorded on a straight-line basis over the term of the agreement based on the Company's best estimate of expected future aircraft utilization. For its engine maintenance contracts that do not transfer risk to the service provider, the Company records expense on a time and materials basis when an engine repair event takes place. Modifications that significantly enhance the operating performance or extend the useful lives of aircraft or engines are capitalized and amortized over the remaining life of the asset.

Goodwill and intangible assets

Goodwill and Intangible Assets

The Company applies a fair value based impairment test to the carrying value of goodwill and indefinite-lived intangible assets annually on October 1st, or more frequently if certain events or circumstances indicate that an impairment loss may have been incurred. The Company assesses the value of goodwill and indefinite-lived assets under either a qualitative or quantitative approach. Under a qualitative approach, the Company considers various market factors, including applicable key assumptions listed below. These factors are analyzed to determine if events and circumstances could reasonably have affected the fair value of goodwill and indefinite-lived intangible assets. If the Company determines that it is more likely than not that an indefinite-lived intangible asset is impaired, the quantitative approach is used to assess the asset’s implied fair value and the amount of the impairment. Under a quantitative approach, the implied fair value of the Company's identifiable assets and liabilities is calculated based on key assumptions. If the Company assets' carrying value exceeds the fair value calculated using the quantitative approach, an impairment charge is recorded for the difference in fair value and carrying value.

The following table is a summary of the Company’s intangible assets, which are included as a component of Other assets in the Company's Consolidated Balance Sheet, as of December 31, 2015 and 2014:

		Year ended December 31, 2015				Year ended December 31, 2014
(in millions)	Weighted-average useful life (in years)	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated Amortization
Customer relationships/marketing agreements	9	$	38	$	30	$	38	$	26
Trademarks/trade names	6	36		34		36		30
Owned domestic slots	Indefinite	303		n/a		303		n/a
Leased domestic slots (b)	47	17		3		19		5
Gate leasehold rights (a)	15	180		43		60		32
Total	15	$	574	$	110	$	456	$	93

(a) Intangible assets primarily consist of acquired leasehold rights to certain airport owned gates at Chicago’s Midway International Airport, takeoff and landing slots (a “slot” is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration (“FAA”), to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports, and certain intangible assets recognized from the AirTran acquisition. The increase in Intangible assets during 2015 was primarily due to the acquisition of two additional airport gate rights at Dallas Love Field, which were subleased from United Airlines. The purchase price paid for these airport gate rights was included as a component of Capital expenditures in the accompanying Consolidated Statement of Cash Flows.

(b) Useful life of leased slots is based on the stated lease term.

The aggregate amortization expense for 2015, 2014, and 2013 was $19 million, $13 million, and $19 million, respectively. Estimated aggregate amortization expense for the five succeeding years and thereafter is as follows: 2016 – $17 million, 2017 – $14 million, 2018 – $13 million, 2019 – $13 million, 2020 – $12 million, and thereafter – $89 million.

Revenue recognition

Revenue Recognition

Tickets sold are initially deferred as Air traffic liability. Passenger revenue is recognized when transportation is provided. Air traffic liability primarily represents tickets sold for future travel dates and funds that are past flight date and remain unused. The majority of the Company’s tickets sold are nonrefundable. Refundable tickets that are sold but not flown on the travel date can be reused for another flight, up to a year from the date of sale, or refunded. A small percentage of tickets (or partial tickets) expire unused. The Company estimates the amount of tickets that expire unused and recognizes such amounts in Passenger revenue using the redemption method based on scheduled flight date. Prior to September 13, 2013, funds associated with tickets in which a passenger did not show up for a flight without canceling were able to be reused on another flight for up to twelve months. On September 13, 2013, Southwest implemented a No Show policy that applies to nonrefundable fares that are not canceled or changed by a Customer at least ten minutes prior to a flight's scheduled departure. Based on the Company's revenue recognition policy, revenue is recorded at the flight date for a Customer who does not change his/her itinerary and loses his/her funds. Amounts collected from passengers for ancillary service fees are generally recognized as Other revenue when the service is provided, which is typically the flight date.

The Company's policy is to record revenue for the estimated spoilage of tickets (including partial tickets) once the flight date has passed, under the redemption method. Initial spoilage estimates are routinely adjusted and ultimately finalized once the tickets expire, which is typically twelve months after the original purchase date. Spoilage estimates are based on the Customers' historical travel behavior as well as assumptions about the Customers' future travel behavior. Assumptions used to generate spoilage estimates can be impacted by several factors including, but not limited to: fare increases, fare sales, changes to the Company's ticketing policies, changes to the Company’s refund, exchange and unused funds policies, or economic factors.

The Company is also required to collect certain taxes and fees from Customers on behalf of government agencies and remit these back to the applicable governmental entity on a periodic basis. These taxes and fees include foreign and U.S. federal transportation taxes, federal security charges, and airport passenger facility charges. 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.

Frequent flyer program

Frequent Flyer Program

The Company records a liability for the estimated incremental cost of providing free travel under its frequent flyer program for all amounts earned from flight activity that are expected to be redeemed for future travel. The estimated incremental cost includes direct passenger costs such as fuel, food, and other operational costs, but does not include any contribution to fixed overhead costs or profit.

Southwest also sells frequent flyer points and related services to companies participating in its frequent flyer program. Historically, funds received from the sale of points associated with these agreements were accounted for under the residual method. Under this method, the Company estimated the portion of the amounts received from the sale of frequent flyer points that related to free travel and these amounts were deferred and recognized as Passenger revenue when the ultimate free travel awards are flown. On July 1, 2015, the Company executed an amended co-branded credit card agreement ("Agreement") with Chase Bank USA, N.A. (“Chase”), through which the Company sells loyalty points and other items to Chase. This material modification triggered an accounting change under ASU 2009-13, which is recorded on a prospective basis. The impact of the accounting change is that the Company estimated the selling prices and volumes over the term of the Agreement in order to determine the allocation of proceeds to each of the deliverables (travel points to be awarded; use of the Southwest Airlines’ brand and access to Rapid Reward Member lists; advertising elements; and the Company’s resource team). The Company records passenger revenue related to air transportation and certificates for discounted companion travel when the transportation is delivered. The other elements are recognized as Other - net revenue when earned.

The Company followed the transition approach of ASU 2009-13, which required that the Company adjust the existing deferred revenue balance to reflect the value, on a relative selling price basis, of any undelivered element remaining at the date of contract modification. The relative selling price of the undelivered element (air transportation) was lower than the rate at which it had been deferred under the previous contract, and the Company recorded a one-time, non-cash adjustment to decrease frequent flyer deferred revenue and increase revenue through the recording of a Special revenue adjustment of $172 million. In addition, 2015 Operating revenues increased by a net $255 million as a result of the Agreement and the resulting July 1, 2015 change in accounting methodology, all of which would have been deferred under the Company's previous accounting. The estimated impacts on revenue and earnings from this change in accounting principle are as follows:

(in millions, except per share amounts)	Year ended December 31, 2015
Passenger revenue	$	(89	)
Special revenue adjustment	172
Other revenue	344
Operating revenues	$	427
Net income	$	227
Net income per basic share	$	0.34
Net income per diluted share	$	0.34

For all points sold to business partners that are expected to expire unused, the Company recognizes spoilage in accordance with the redemption method. The Company’s consolidated liability associated with the sale of frequent flyer points, was approximately $1.3 billion as of December 31, 2015, and 2014, which is classified within Air traffic liability. During fourth quarter 2014, the Company obtained sufficient historical behavioral data to develop a predictive statistical model to analyze the amount of spoilage expected for points sold to business partners, which indicated an increase in the expected spoilage rate. This change in estimate was recorded on a prospective basis, as of October 1, 2014, the impacts on revenue and earnings are as follows:

(in millions, except per share amounts)	Year ended December 31, 2015		Year ended December 31, 2014
Passenger revenue	$	115	$	55
Net income	$	61	$	29
Net income per basic share	$	0.09	$	0.04
Net income per diluted share	$	0.09	$	0.04

Advertising

Advertising

Advertising costs are charged to expense as incurred. Advertising and promotions expense for the years ended December 31, 2015, 2014, and 2013 was $218 million, $207 million, and $208 million, respectively, and is included as a component of Other operating expense in the accompanying Consolidated Statement of Income.

Share-based Employee compensation

Share-based Employee Compensation

The Company has share-based compensation plans covering certain Employees, including a plan that also covers the Company’s Board of Directors. The Company accounts for share-based compensation based on its grant date fair value. See Note 9 for further information.

The Company accounts for share-based compensation utilizing fair value, which is determined on the date of grant for all instruments.

A portion of the Company’s granted options qualify as incentive stock options for income tax purposes. As such, a tax benefit is not recorded at the time the compensation cost related to the options is recorded for book purposes due to the fact that an incentive stock option does not ordinarily result in a tax benefit unless there is a disqualifying disposition. Grants of non-qualified stock options result in the creation of a deferred tax asset, which is a temporary difference, until the time that the option is exercised. Due to the treatment of incentive stock options for tax purposes, the Company’s effective tax rate from year to year is subject to variability.

Outstanding RSUs vest over three years, subject generally to the individual’s continued employment or service. The Company recognizes all expense on a straight-line basis over the vesting period, with any changes in expense due to the number of PBRSUs expected to vest being modified on a prospective basis. The PBRSUs granted in May 2014 and February 2015 are subject to the Company’s performance with respect to a three-year simple average of Return on Invested Capital, before taxes and excluding special items ("ROIC"), for the defined performance period and the individual’s continued employment or service. The number of PBRSUs vesting on the vesting date will be interpolated based on the Company's ROIC performance and ranges from zero PBRSUs to 200 percent of granted PBRSUs.

Fair Value of Financial Instruments

Financial Derivative Instruments

The Company accounts for financial derivative instruments at fair value and applies hedge accounting rules where appropriate. The Company utilizes various derivative instruments, including jet fuel, crude oil, unleaded gasoline, and heating oil-based derivatives, to attempt to reduce the risk of its exposure to jet fuel price increases. These instruments consist primarily of purchased call options, collar structures, call spreads, put spreads, and fixed price swap agreements, and upon proper qualification are accounted for as cash-flow hedges. The Company also has interest rate swap agreements to convert a portion of its fixed-rate debt to floating rates and has swap agreements that convert certain floating-rate debt to a fixed-rate. These interest rate hedges are appropriately designated as either fair value hedges or as cash flow hedges.

Since the majority of the Company’s financial derivative instruments are not traded on a market exchange, the Company estimates their fair values. Depending on the type of instrument, the values are determined by the use of present value methods or option value models with assumptions about commodity prices based on those observed in underlying markets. Also, since there is not a reliable forward market for jet fuel, the Company must estimate the future prices of jet fuel in order to measure the effectiveness of the hedging instruments in offsetting changes to those prices. Forward jet fuel prices are estimated through utilization of a statistical-based regression equation with data from market forward prices of like commodities. This equation is then adjusted for certain items, such as transportation costs, that are stated in the Company’s fuel purchasing contracts with its vendors.

For the effective portion of settled fuel hedges, the Company records the associated gains or losses as a component of Fuel and oil expense in the Consolidated Statement of Income. For amounts representing ineffectiveness, as defined, or changes in fair value of derivative instruments for which hedge accounting is not applied, the Company records any gains or losses as a component of Other (gains) losses, net, in the Consolidated Statement of Income. Amounts that are paid or received in connection with the purchase or sale of financial derivative instruments (i.e., premium costs of option contracts) are classified as a component of Other (gains) losses, net, in the Consolidated Statement of Income in the period in which the instrument settles or expires. All cash flows associated with purchasing and selling derivatives are classified as operating cash flows in the Consolidated Statement of Cash Flows, within Changes in certain assets and liabilities. See Note 10 for further information on hedge accounting and financial derivative instruments.

The Company classifies its cash collateral provided to or held from counterparties in a “net” presentation on the Consolidated Balance Sheet against the fair value of the derivative positions with those counterparties. See Note 10 for further information.

Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

As of December 31, 2015, the Company held certain items that are required to be measured at fair value on a recurring basis. These included cash equivalents, short-term investments (primarily treasury bills and certificates of deposit), interest rate derivative contracts, fuel derivative contracts, and available-for-sale securities. The majority of the Company’s short-term investments consist of instruments classified as Level 1. However, the Company has certificates of deposit, commercial paper, and Eurodollar time deposits that are classified as Level 2, due to the fact that the fair value for these instruments is determined utilizing observable inputs in non-active markets. Other available-for-sale securities primarily consist of investments associated with the Company’s excess benefit plan.

The Company’s fuel and interest rate derivative instruments consist of over-the-counter contracts, which are not traded on a public exchange. Fuel derivative instruments include swaps, as well as different types of option contracts, whereas interest rate derivatives consist solely of swap agreements. See Note 10 for further information on the Company’s derivative instruments and hedging activities. The fair values of swap contracts 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 has categorized these swap contracts as Level 2. The Company’s Treasury Department, which reports to the Chief Financial Officer, determines the value of option contracts utilizing an option pricing model based on inputs that are either readily available in public markets, can be derived from information available in publicly quoted markets, or are provided by financial institutions that trade these contracts. The option pricing model used by the Company is an industry standard model for valuing options and is the same model used by the broker/dealer community (i.e., the Company’s counterparties). The inputs to this option pricing model are the option strike price, underlying price, risk free rate of interest, time to expiration, and volatility. Because certain inputs used to determine the fair value of option contracts are unobservable (principally implied volatility), the Company has categorized these option contracts as Level 3. Volatility information is obtained from external sources, but is analyzed by the Company for reasonableness and compared to similar information received from other external sources. The fair value of option contracts considers both the intrinsic value and any remaining time value associated with those derivatives that have not yet settled. The Company also considers counterparty credit risk and its own credit risk in its determination of all estimated fair values. To validate the reasonableness of the Company’s option pricing model, on a monthly basis, the Company compares its option valuations to third party valuations. If any significant differences were to be noted, they would be researched in order to determine the reason. However, historically, no significant differences have been noted. 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 significant unobservable input used in the fair value measurement of the Company’s derivative option contracts is implied volatility. Holding other inputs constant, a significant increase (decrease) in implied volatility would result in a significantly higher (lower) fair value measurement, respectively, for the Company’s derivative option contracts.

Software capitalization

Software Capitalization

The Company capitalizes certain internal and external costs related to the acquisition and development of internal use software during the application development stages of projects. The Company amortizes these costs using the straight-line method over the estimated useful life of the software, which typically ranges from five to fifteen years. Costs incurred during the preliminary project or the post-implementation/operation stages of the project are expensed as incurred. Capitalized computer software, included as a component of Ground property and equipment in the accompanying Consolidated Balance Sheet, net of accumulated depreciation, was $378 million and $403 million at December 31, 2015, and 2014, respectively. Computer software depreciation expense was $106 million, $122 million, and $90 million for the years ended December 31, 2015, 2014, and 2013, respectively, and is included as a component of Depreciation and amortization expense in the accompanying Consolidated Statement of Income.

Income taxes

Income Taxes

The Company accounts for deferred income taxes utilizing an asset and liability method, whereby deferred tax assets and liabilities are recognized based on the tax effect of temporary differences between the financial statements and the tax basis of assets and liabilities, as measured by current enacted tax rates. The Company also evaluates the need for a valuation allowance to reduce deferred tax assets to estimated recoverable amounts. See "Basis of Presentation" for further information on current presentation of deferred income taxes.

The Company’s policy for recording interest and penalties associated with uncertain tax positions is to record such items as a component of income before income taxes. Penalties are recorded in Other (gains) losses, net, and interest paid or received is recorded in Interest expense or Interest income, respectively, in the Consolidated Statement of Income. Amounts recorded for penalties and interest related to uncertain tax positions were immaterial for all years presented.

Concentration risk

Concentration Risk

Approximately 83 percent of the Company’s full-time equivalent Employees are unionized and are covered by collective-bargaining agreements. The majority of the Company's unionized Employees, including its Pilots, Mechanics, Ramp, Operations, Provisioning and Freight Agents, Flight Attendants, Material Specialists, Flight Crew Training Instructors, Facilities Maintenance Technicians, and Source of Support Representatives are in discussions on labor agreements or have labor agreements which will become amendable within one year. These Employee groups represent approximately 69 percent of the Company’s full-time equivalent Employees as of December 31, 2015.

The Company attempts to minimize its concentration risk with regards to its cash, cash equivalents, and its investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security or money market fund.

To manage risk associated with financial derivative instruments held, the Company selects and will periodically review counterparties based on credit ratings, limits its exposure to a single counterparty, and monitors the market position of the program and its relative market position with each counterparty. The Company also has agreements with counterparties containing early termination rights and/or bilateral collateral provisions whereby security is required if market risk exposure exceeds a specified threshold amount or credit ratings fall below certain levels. Collateral deposits provided to or held from counterparties serve to decrease, but not totally eliminate, the credit risk associated with the Company’s hedging program. See Note 10 for further information.

As of December 31, 2015, the Company operated an all-Boeing fleet, all of which are variations of the Boeing 737. Following the 2011 acquisition of AirTran, the Company also operated a fleet of Boeing 717's, but these aircraft were removed from the Company's operations prior to the end of 2014. See Note 7 for further information. If the Company were unable to acquire additional aircraft or associated aircraft parts from Boeing, or Boeing were unable or unwilling to make timely deliveries of aircraft or to provide adequate support for its products, the Company’s operations would be materially adversely impacted. In addition, the Company would be materially adversely impacted in the event of a mechanical or regulatory issue associated with the Boeing 737 aircraft type, whether as a result of downtime for part or all of the Company’s fleet, increased maintenance costs, or because of a negative perception by the flying public. The Company is also dependent on sole suppliers for aircraft engines and certain other aircraft parts and would, therefore, also be materially adversely impacted in the event of the unavailability of, or a mechanical or regulatory issue associated with, engines and other parts.

The Company has historically entered into agreements with some of its co-brand, payment, and loyalty partners that contain exclusivity aspects which place certain confidential restrictions on the Company from entering into certain arrangements with other payment and loyalty partners. These arrangements generally extend for the terms of the partnerships, none of which currently extend beyond May 2022. The Company believes the financial benefits generated by the exclusivity aspects of these arrangements outweigh the risks involved with such agreements.

Derivatives

The Company is party to certain interest rate swap agreements that are accounted for as either fair value hedges or cash flow hedges, as defined in the applicable accounting guidance for derivative instruments and hedging. Several of the Company's interest rate swap agreements qualify for the “shortcut” method of accounting for hedges, which dictates that the hedges are assumed to be perfectly effective, and, thus, there is no ineffectiveness to be recorded in earnings. For the Company’s interest rate swap agreements that do not qualify for the "shortcut" method of accounting, ineffectiveness is required to be measured at each reporting period

Upon proper qualification, the Company accounts for its fuel derivative instruments as cash flow hedges. Generally, utilizing hedge accounting, all periodic changes in fair value of the derivatives designated as hedges that are considered to be effective are recorded in Accumulated other comprehensive income (loss) ("AOCI") until the underlying jet fuel is consumed. See Note 12. The Company’s results are subject to the possibility that periodic changes will not be effective, as defined, or that the derivatives will no longer qualify for hedge accounting. Ineffectiveness results when the change in the fair value of the derivative instrument exceeds the change in the value of the Company’s expected future cash outlay to purchase and consume jet fuel. To the extent that the periodic changes in the fair value of the derivatives are ineffective, the ineffective portion is recorded to Other (gains) losses, net, in the Consolidated Statement of Income. Likewise, if a hedge ceases to qualify for hedge accounting, any change in the fair value of derivative instruments since the last reporting period is recorded to Other (gains) losses, net, in the Consolidated Statement of Income in the period of the change; however, any amounts previously recorded to AOCI would remain there until such time as the original forecasted transaction occurs, at which time these amounts would be reclassified to Fuel and oil expense. When the Company has sold derivative positions in order to effectively “close” or offset a derivative already held as part of its fuel derivative instrument portfolio, any subsequent changes in fair value of those positions are marked to market through earnings. Likewise, any changes in fair value of those positions that were offset by entering into the sold positions and were de-designated as hedges are concurrently marked to market through earnings. However, any changes in value related to hedges that were deferred as part of AOCI while designated as a hedge would remain until the originally forecasted transaction occurs. In a situation where it becomes probable that a fuel hedged forecasted transaction will not occur, any gains and/or losses that have been recorded to AOCI would be required to be immediately reclassified into earnings. The Company did not have any such situations occur during 2013, 2014, or 2015.

In some situations, an entire commodity type used in hedging may cease to qualify for special hedge accounting treatment

All of the Company's fuel derivative instruments and interest rate swaps are subject to agreements that follow the netting guidance in the applicable accounting for derivatives and hedging. The types of derivative instruments the Company has determined are subject to netting requirements in the accompanying Consolidated Balance Sheet are those in which the Company pays or receives cash for transactions with the same counterparty and in the same currency via one net payment or receipt. For cash collateral held by the Company or provided to counterparties, the Company nets such amounts against the fair value of the Company's derivative portfolio by each counterparty. The Company has elected to utilize netting for both its fuel derivative instruments and interest rate swap agreements and also classifies such amounts as either current or noncurrent, based on the net fair value position with each of the Company's counterparties in the Consolidated Balance Sheet.

The Company's application of its netting policy associated with cash collateral differs depending on whether its derivative instruments are in a net asset position or a net liability position. If its fuel derivative instruments are in a net asset position with a counterparty, cash collateral amounts held are first netted against current outstanding derivative amounts associated with that counterparty until that balance is zero, and then any remainder is applied against the fair value of noncurrent outstanding derivative instruments. If the Company's fuel derivative instruments are in a net liability position with the counterparty, cash collateral amounts provided are first netted against noncurrent outstanding derivative amounts associated with that counterparty until that balance is zero, and then any remainder is applied against the fair value of current outstanding derivative instruments

Ineffectiveness is inherent in hedging jet fuel with derivative positions based in other crude oil related commodities. Due to the volatility in markets for crude oil and related products, the Company is unable to predict the amount of ineffectiveness each period, including the loss of hedge accounting, which could be determined on a derivative by derivative basis or in the aggregate for a specific commodity. This may result, and has resulted, in increased volatility in the Company’s financial results. Factors that have and may continue to lead to ineffectiveness and unrealized gains and losses on derivative contracts include: significant fluctuation in energy prices, the number of derivative positions the Company holds, significant weather events affecting refinery capacity and the production of refined products, and the volatility of the different types of products the Company uses in hedging. However, even though derivatives may not qualify for hedge accounting, the Company continues to hold the instruments as management believes derivative instruments continue to afford the Company the opportunity to stabilize jet fuel costs.

Accounting pronouncements pertaining to derivative instruments and hedging are complex with stringent requirements, including the documentation of a Company hedging strategy, statistical analysis to qualify a commodity for hedge accounting both on a historical and a prospective basis, and strict contemporaneous documentation that is required at the time each hedge is designated by the Company. The Company also examines the effectiveness of each individual hedge and its entire hedging program on a quarterly basis utilizing statistical analysis. This analysis involves utilizing regression and other statistical analyses that compare changes in the price of jet fuel to changes in the prices of the commodities used for hedging purposes

Compensation Related Costs

A portion of the Company’s granted options qualify as incentive stock options for income tax purposes. As such, a tax benefit is not recorded at the time the compensation cost related to the options is recorded for book purposes due to the fact that an incentive stock option does not ordinarily result in a tax benefit unless there is a disqualifying disposition. Grants of non-qualified stock options result in the creation of a deferred tax asset, which is a temporary difference, until the time that the option is exercised. Due to the treatment of incentive stock options for tax purposes, the Company’s effective tax rate from year to year is subject to variability.

Employee Retirement Plans

Unrecognized prior service cost is expensed using a straight-line amortization of the cost over the average future service of Employees expected to receive benefits under the plans. Actuarial gains are amortized utilizing the minimum amortization method. The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31,2015, 2014, and 2013:

	2015		2014		2013
Weighted-average discount rate	4.50	%	4.10	%	5.05	%
Assumed healthcare cost trend rate (1)	7.08	%	6.88	%	7.50	%

(1) The assumed healthcare cost trend rate is assumed to remain at 7.08% for 2016, then decline gradually to 5.19% by 2026 and remain level thereafter.

The assumed healthcare cost trend rates have a significant effect on the amounts reported for the consolidated postretirement plans. A one percent change in all healthcare cost trend rates used in measuring the APBO at December 31, 2015, would have the following effects:

(in millions)	1% increase		1% decrease
Increase (decrease) in total service and interest costs	$	3	$	(2	)
Increase (decrease) in the APBO	$	29	$	(24	)

The selection of a discount rate is made annually and is selected by the Company based upon comparison of the expected future cash flows associated with the Company’s future payments under its consolidated postretirement obligations to a yield curve created using high quality bonds that closely match those expected future cash flows. This rate increased during 2015 due to market conditions. The assumed healthcare trend rate is also reviewed at least annually and is determined based upon both historical experience with the Company’s healthcare benefits paid and expectations of how those trends may or may not change in future years.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of Finite Lived Intangible Assets

The following table is a summary of the Company’s intangible assets, which are included as a component of Other assets in the Company's Consolidated Balance Sheet, as of December 31, 2015 and 2014:

		Year ended December 31, 2015				Year ended December 31, 2014
(in millions)	Weighted-average useful life (in years)	Gross carrying amount		Accumulated amortization		Gross carrying amount		Accumulated Amortization
Customer relationships/marketing agreements	9	$	38	$	30	$	38	$	26
Trademarks/trade names	6	36		34		36		30
Owned domestic slots	Indefinite	303		n/a		303		n/a
Leased domestic slots (b)	47	17		3		19		5
Gate leasehold rights (a)	15	180		43		60		32
Total	15	$	574	$	110	$	456	$	93

(a) Intangible assets primarily consist of acquired leasehold rights to certain airport owned gates at Chicago’s Midway International Airport, takeoff and landing slots (a “slot” is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration (“FAA”), to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports, and certain intangible assets recognized from the AirTran acquisition. The increase in Intangible assets during 2015 was primarily due to the acquisition of two additional airport gate rights at Dallas Love Field, which were subleased from United Airlines. The purchase price paid for these airport gate rights was included as a component of Capital expenditures in the accompanying Consolidated Statement of Cash Flows.

(b) Useful life of leased slots is based on the stated lease term.

Schedule of New Accounting Principles - Chase Agreement

The estimated impacts on revenue and earnings from this change in accounting principle are as follows:

(in millions, except per share amounts)	Year ended December 31, 2015
Passenger revenue	$	(89	)
Special revenue adjustment	172
Other revenue	344
Operating revenues	$	427
Net income	$	227
Net income per basic share	$	0.34
Net income per diluted share	$	0.34

Schedule of Change in Accounting Estimate [Table Text Block]

This change in estimate was recorded on a prospective basis, as of October 1, 2014, the impacts on revenue and earnings are as follows:

(in millions, except per share amounts)	Year ended December 31, 2015		Year ended December 31, 2014
Passenger revenue	$	115	$	55
Net income	$	61	$	29
Net income per basic share	$	0.09	$	0.04
Net income per diluted share	$	0.09	$	0.04

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Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Basic And Diluted

The following table sets forth the computation of basic and diluted net income per share (in millions except per share amounts):

	Year ended December 31,
	2015		2014		2013
NUMERATOR:
Net income	$	2,181	$	1,136	$	754
Incremental income effect of   interest on 5.25% convertible notes	4		4		3
Net income after assumed conversion	$	2,185	$	1,140	$	757
DENOMINATOR:
Weighted-average shares outstanding, basic	661		687		710
Dilutive effect of Employee stock options and   restricted stock units	2		3		2
Dilutive effect of 5.25% convertible notes	6		6		6
Adjusted weighted-average shares outstanding, diluted	669		696		718
NET INCOME PER SHARE:
Basic	$	3.30	$	1.65	$	1.06
Diluted	$	3.27	$	1.64	$	1.05
Potentially dilutive amounts excluded from calculations:
Stock options and restricted stock units	—		—		9

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Property, Plant and Equipment [Table Text Block]

Contractual Purchase Commitments

As of December 31, 2015, the Company had firm deliveries and options for Boeing 737-700, 737-800, 737 MAX 7, and 737 MAX 8 aircraft as follows:

	The Boeing Company 737 NG				The Boeing Company 737 MAX
	-800 Firm Orders	Options	Additional -700 A/C		-7 Firm Orders	-8 Firm Orders		Options	Total
2016	36	—	17		—	—		—	53
2017	35	—	14		—	14		—	63
2018	18	18	4		—	13		—	53
2019	—	—	—		15	10		—	25
2020	—	—	—		14	22		—	36
2021	—	—	—		1	33		18	52
2022	—	—	—		—	30		19	49
2023	—	—	—		—	24		23	47
2024	—	—	—		—	24		23	47
2025	—	—	—		—	—		36	36
2026	—	—	—		—	—		36	36
2027	—	—	—		—	—		36	36
Total	89	18	35	(b)	30	170	(a)	191	533

(a) The Company has flexibility to substitute MAX 7 in lieu of MAX 8 firm orders beginning in 2019.

(b) To be acquired in leases from various third parties.

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Supplemental Financial Information (Tables)

12 Months Ended

Dec. 31, 2015

Table Text Block [Abstract]

Other Assets

(in millions)	December 31, 2015		December 31, 2014
Intangible assets	$	464	$	363
Non-current investments	40		35
Other	213		136
Other assets	$	717	$	534

Accounts Payable

(in millions)	December 31, 2015		December 31, 2014
Accounts payable trade	$	178	$	123
Salaries payable	173		160
Taxes payable	179		163
Aircraft maintenance payable	168		314
Fuel payable	48		85
Other payable	442		358
Accounts payable	$	1,188	$	1,203

Accrued Liabilities

(in millions)	December 31, 2015			December 31, 2014
Profitsharing and savings plans	$	655		$	374
Aircraft and other lease related obligations	74			159
Vacation pay	309			292
Accrued union bonuses	329		(a)	9
Health	86			84
Derivative contracts	643			174
Workers compensation	187			165
Property and other taxes	62			81
Other	246			227
Accrued liabilities	$	2,591		$	1,565

(a) As part of the ongoing negotiations with various union contract groups during 2015, the Company has recorded a liability for estimated bonuses that would be paid out to union members upon ratification of labor agreements. The liability excludes certain immaterial benefit costs that are included as a component of Accounts payable. The amount accrued is subject to change based on subsequent negotiations, and any changes would be recorded on a prospective basis.

Other Noncurrent Liabilities

(in millions)	December 31, 2015		December 31, 2014
Postretirement obligation	$	201	$	169
Non-current lease-related obligations	165		193
Other deferred compensation	179		174
Deferred gains from sale and leaseback of aircraft	43		53
Derivative contracts	74		622
Other	98		44
Other non-current liabilities	$	760	$	1,255

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Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

(in millions)	December 31, 2015		December 31, 2014
5.75% Notes due 2016	$	307	$	313
5.25% Convertible Senior Notes due 2016	111		113
5.125% Notes due 2017	309		316
French Credit Agreements due 2018—1.53%	25		36
Fixed-rate 737 Aircraft Notes payable through 2018—7.02%	17		24
2.75% Notes due 2019	303		300
Term Loan Agreement due 2019—6.315%	143		178
Term Loan Agreement due 2019—4.84%	36		73
2.65% Notes due 2020	494		—
Term Loan Agreement due 2020—5.223%	329		372
Floating-rate 737 Aircraft Notes payable through 2020	257		300
Pass Through Certificates due 2022—6.24%	340		355
7.375% Debentures due 2027	132		134
Capital leases	395		199
	$	3,198	$	2,713
Less current maturities	637		258
Less debt discount and issuance costs	20		21
	$	2,541	$	2,434

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Leases (Tables)

12 Months Ended

Dec. 31, 2015

Leases [Abstract]

Capital Leases Aircraft Included In Property And Equipment

Amounts applicable to these aircraft that are included in property and equipment were:

(in millions)	2015		2014
Flight equipment	$	435	$	214
Less: accumulated amortization	29		22
	$	406	$	192

Future Minimum Lease Payments Under Capital Leases And Noncancelable Operating Leases

Future minimum lease payments under capital leases and noncancelable operating leases and rentals to be received under subleases with initial or remaining terms in excess of one year at December 31, 2015, were:

(in millions)	Capital leases		Operating leases		Subleases			LFMP facility lease*		Operating leases, net
2016	$	46	$	636	$	(103	)	$	24	$	557
2017	46		624		(103		)	24		545
2018	45		551		(102		)	25		474
2019	45		479		(97		)	25		407
2020	44		359		(78		)	26		307
Thereafter	209		961		(66		)	634		1,529
Total minimum lease payments	$	435	$	3,610	$	(549	)	$	758	$	3,819
Less amount representing interest	79
Present value of minimum lease payments	356
Less current portion	32
Long-term portion	$	324
* See Note 4 for further details

Sublease Rollforward

A rollforward of the Company's B717 lease/sublease liability for 2015 and 2014 is shown below:

(in millions)	B717 lease/sublease liability
Balance at December 31, 2013	$	122
Lease/sublease accretion	5
Lease/sublease expense adjustment	22
Lease/sublease payments, net (a)	(86		)
Balance at December 31, 2014	$	63
Lease/sublease accretion	1
Lease/sublease expense adjustment	2
Lease/sublease payments, net (a)	(48		)
Balance at December 31, 2015	$	18

(a) Includes lease conversion cost payments

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Stock Plans (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

Aggregated information regarding the Company’s RSUs and PBRSUs is summarized below:

	All Restricted Stock Units
	Units (000)			Wtd. Average Fair Value (per share)
Outstanding December 31, 2012, Unvested	2,876			$	9.57
Granted	1,139			14.34
Vested	(1,263	)		10.24
Surrendered	(168	)		9.11
Outstanding December 31, 2013	2,584			11.38
Granted	834		(a)	24.93
Vested	(1,239	)		11.05
Surrendered	(102	)		13.18
Outstanding December 31, 2014	2,077			16.92
Granted	561		(b)	45.80
Vested	(1,095	)		13.33
Surrendered	(58	)		25.49
Outstanding December 31, 2015, Unvested	1,485			$	30.17

(a) Includes 198 thousand shares of PBRSUs

(b) Includes 183 thousand shares of PBRSUs

Schedule of Share-based Compensation, Stock Options, Activity

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Financial Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Volume of Fuel Hedging

The following table provides information about the Company’s volume of fuel hedging for the years 2016 through 2018 on an “economic” basis considering current market prices:

	Fuel hedged as of
	December 31, 2015	Derivative underlying commodity type as of
Period (by year)	(gallons in millions) (a)	December 31, 2015
2016	1,226	Brent crude oil, Heating oil, and Gulf Coast jet fuel
2017	1,503	WTI crude and Brent crude oil
2018	731	Brent crude oil

(a) Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place and may vary significantly as market prices fluctuate.

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The following table presents the location of all assets and liabilities associated with the Company’s hedging instruments within the Consolidated Balance Sheet:

		Asset derivatives				Liability derivatives
	Balance Sheet	Fair value at		Fair value at		Fair value at		Fair value at
(in millions)	location	12/31/2015		12/31/2014		12/31/2015		12/31/2014
Derivatives designated as hedges*
Fuel derivative contracts (gross)	Prepaid expenses and other current assets	$	2	$	—	$	—	$	—
Fuel derivative contracts (gross)	Other assets	2		—		—		—
Fuel derivative contracts (gross)	Accrued liabilities	107		—		526		—
Fuel derivative contracts (gross)	Other noncurrent liabilities	55		—		658		643
Interest rate derivative contracts	Other assets	2		13		—		—
Interest rate derivative contracts	Other noncurrent liabilities	—		—		49		61
Total derivatives designated as hedges		$	168	$	13	$	1,233	$	704
Derivatives not designated as hedges*
Fuel derivative contracts (gross)	Prepaid expenses and other current assets	$	39	$	—	$	26	$	—
Fuel derivative contracts (gross)	Other assets	5		—		—		—
Fuel derivative contracts (gross)	Accrued liabilities	1,395		1,190		1,854		1,432
Fuel derivative contracts (gross)	Other noncurrent liabilities	330		157		352		273
Total derivatives not designated as hedges		$	1,769	$	1,347	$	2,232	$	1,705
Total derivatives		$	1,937	$	1,360	$	3,465	$	2,409

* Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.

Cash Collateral Deposits Due To Or From Third Parties and Net Unrealized Losses

In addition, the Company also had the following amounts associated with fuel derivative instruments and hedging activities in its Consolidated Balance Sheet:

	Balance Sheet	December 31,		December 31,
(in millions)	location	2015		2014
Cash collateral deposits provided to counterparties for fuel   contracts - current	Offset against Accrued liabilities	$	235	$	68
Cash collateral deposits provided to counterparties for fuel   contracts- noncurrent	Offset against Other noncurrent liabilities	600		198
Due to third parties for fuel contracts	Accrued liabilities	46		16

Offsetting Assets

The Company has the following recognized financial assets and financial liabilities resulting from those transactions that meet the scope of the disclosure requirements as necessitated by applicable accounting guidance for balance sheet offsetting:

Offsetting of derivative assets
(in millions)
		(i)		(ii)			(iii) = (i) + (ii)		(i)		(ii)			(iii) = (i) + (ii)
		December 31, 2015							December 31, 2014
Description	Balance Sheet location	Gross amounts of recognized assets		Gross amounts offset in the Balance Sheet			Net amounts of assets presented in the Balance Sheet (a)		Gross amounts of recognized assets		Gross amounts offset in the Balance Sheet			Net amounts of assets presented in the Balance Sheet (a)
Fuel derivative contracts	Prepaid expenses and other current assets	$	41	$	(26	)	$	15	$	—	$	—		$	—
Fuel derivative contracts	Other assets	$	7	$	—		$	7	$	—	$	—		$	—
Fuel derivative contracts	Accrued liabilities	$	1,737	$	(1,737	)	$	—	$	1,258	$	(1,258	)	$	—
Fuel derivative contracts	Other noncurrent liabilities	$	985	$	(985	)	$	—	$	355	$	(355	)	$	—
Interest rate derivative contracts	Other assets	$	2	$	—		$	2	$	13	$	—		$	13

(a) The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

Offsetting Liabilities

		(i)		(ii)			(iii) = (i) + (ii)		(i)		(ii)			(iii) = (i) + (ii)
		December 31, 2015							December 31, 2014
Description	Balance Sheet location	Gross amounts of recognized liabilities		Gross amounts offset in the Balance Sheet			Net amounts of liabilities presented in the Balance Sheet (a)		Gross amounts of recognized liabilities		Gross amounts offset in the Balance Sheet			Net amounts of liabilities presented in the Balance Sheet (a)
Fuel derivative contracts	Prepaid expenses and other current assets	$	26	$	(26	)	$	—	$	—	$	—		$	—
Fuel derivative contracts	Accrued liabilities	$	2,380	$	(1,737	)	$	643	$	1,432	$	(1,258	)	$	174
Fuel derivative contracts	Other noncurrent liabilities	$	1,010	$	(985	)	$	25	$	916	$	(355	)	$	561
Interest rate derivative contracts	Other noncurrent liabilities	$	49	$	—		$	49	$	61	$	—		$	61

(a) The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

Derivatives in Cash Flow Hedging Relationships

The following tables present the impact of derivative instruments and their location within the Consolidated Statement of Income for the year endedDecember 31, 2015 and 2014:

Derivatives in cash flow hedging relationships
	(Gain) loss recognized in AOCI on derivatives (effective portion)						(Gain) loss reclassified from AOCI into income (effective portion)(a)						(Gain) loss recognized in income on derivatives (ineffective portion)(b)
	Year ended						Year ended						Year ended
	December 31,						December 31,						December 31,
(in millions)	2015			2014			2015			2014			2015			2014
Fuel derivative contracts	$	546	*	$	749	*	$	238	*	$	22	*	$	(9	)	$	7
Interest rate derivatives	4		*	6		*	13		*	14		*	(4		)	(4		)
Total	$	550		$	755		$	251		$	36		$	(13	)	$	3

*Net of tax

(a) Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.

(b) Amounts are included in Other (gains) losses, net.

Derivatives Not in Cash Flow Hedging Relationships

Derivatives not in cash flow hedging relationships
	(Gain) loss
	recognized in income on
	derivatives
	Year ended				Location of (gain) loss
	December 31,				recognized in income
(in millions)	2015		2014		on derivatives
Fuel derivative contracts	$	444	$	244	Other (gains) losses, net

Fair Values of Fuel Derivatives, Amounts Posted as Collateral, and Collateral Posting Threshold Amounts

The following table provides the fair values of fuel derivatives, amounts posted as collateral, and applicable collateral posting threshold amounts as of December 31, 2015, at which such postings are triggered:

	Counterparty (CP)
(in millions)	A			B			C			D			E			F		Other(a)		Total
Fair value of fuel derivatives	$	(562	)	$	(201	)	$	(176	)	$	(411	)	$	(159	)	$	20	$	8	$	(1,481	)
Cash collateral held (by) CP	(284		)	(159		)	(56		)	(299		)	(37		)	—		—		(835		)
Aircraft collateral pledged to CP	(250		)	—			—			—			—			—		—		(250		)
Letters of credit (LC)	—			—			—			—			—			—		—		—
Option to substitute LC for aircraft	(200) to (600)(h)			(100) to (500)(d)			N/A			(150) to (550)(d)			(150) to (550)(d)			N/A
Option to substitute LC for cash	N/A			>(500)(e)			(225) to (275)(e)			(75) to (150) or >(550)(e)			(125) to (150) or >(550)(e)			(g)
If credit rating is investment grade, fair value of fuel derivative level at which:
Cash is provided to CP	(50) to (200) or >(600)			(50) to (100) or >(500)			>(125)			(75) to (150) or >(550)			(125) to (150) or >(550)			>(100)
Cash is received from CP	>50			>150			>175(c)			>250			>75			>0
Aircraft or cash can be pledged to   CP as collateral	(200) to (600)(f)			(100) to (500)(d)			N/A			(150) to (550)(d)			(150) to (550)(d)			N/A
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Cash is provided to CP	(0) to (200) or >(600)			(0) to (100) or >(500)			(b)			(0) to (150) or >(550)			(0) to (150) or >(550)			(b)
Cash is received from CP	(b)			(b)			(b)			(b)			(b)			(b)
Aircraft or cash can be pledged to   CP as collateral	(200) to (600)			(100) to (500)			N/A			(150) to (550)			(150) to (550)			N/A

(a) Individual counterparties with fair value of fuel derivatives <$10 million.

(b) Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.

(c) Thresholds may vary based on changes in credit ratings within investment grade.

(d) The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.

(e) The Company has the option of providing cash or letters of credit as collateral.

(f) The Company has the option of providing cash or pledging aircraft as collateral.

(g) The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.

(h) The Company has the option of providing letters of credit in addition to aircraft collateral if the appraised value of the aircraft does not meet the collateral requirement.

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis at December 31, 2015, and December 31, 2014:

				Fair value measurements at reporting date using:
				Quoted prices in active markets for identical assets		Significant other observable inputs			Significant unobservable inputs
Description	December 31, 2015			(Level 1)		(Level 2)			(Level 3)
Assets	(in millions)
Cash equivalents
Cash equivalents (a)	$	1,337		$	1,337	$	—		$	—
Commercial paper	200			—		200			—
Certificates of deposit	13			—		13			—
Eurodollar Time Deposits	33			—		33			—
Short-term investments:
Treasury bills	1,248			1,248		—			—
Certificates of deposit	220			—		220			—
Interest rate derivatives (see Note 10)	2			—		2			—
Fuel derivatives:
Swap contracts (b)	38			—		38			—
Swap contracts (c)	931			—		931			—
Option contracts (b)	10			—		—			10
Option contracts (c)	956			—		—			956
Other available-for-sale securities	93			66		—			27
Total assets	$	5,081		$	2,651	$	1,437		$	993
Liabilities
Fuel derivatives:
Swap contracts (c)	$	(774	)	$	—	$	(774	)	$	—
Option contracts (b)	(26		)	—		—			(26		)
Option contracts (c)	(2,616		)	—		—			(2,616		)
Interest rate derivatives (see Note 10)	(49		)	—		(49		)	—
Total liabilities	$	(3,465	)	$	—	$	(823	)	$	(2,642	)

(a) Cash equivalents are primarily composed of money market investments.

(b) In the Consolidated Balance Sheet amounts are presented as a net asset. See Note 10.

(c) In the Consolidated Balance Sheet amounts are presented as a net liability. See Note 10.

				Fair value measurements at reporting date using:
				Quoted prices in active markets for identical assets		Significant other observable inputs			Significant unobservable inputs
Description	December 31, 2014			(Level 1)		(Level 2)			(Level 3)
Assets	(in millions)
Cash equivalents
Cash equivalents (a)	$	1,110		$	1,110	$	—		$	—
Commercial paper	70			—		70			—
Certificates of deposit	4			—		4			—
Eurodollar Time Deposits	98			—		98			—
Short-term investments:
Treasury bills	1,450			1,450		—			—
Certificates of deposit	256			—		256			—
Interest rate derivatives (see Note 10)	13			—		13			—
Fuel derivatives:
Swap contracts (b)	455			—		455			—
Option contracts (b)	892			—		—			892
Other available-for-sale securities	95			63		—			32
Total assets	$	4,443		$	2,623	$	896		$	924
Liabilities
Fuel derivatives:
Swap contracts (b)	$	(365	)	$	—	$	(365	)	$	—
Option contracts (b)	(1,983		)	—		—			(1,983		)
Interest rate derivatives (see Note 10)	(61		)	—		(61		)	—
Total liabilities	$	(2,409	)	$	—	$	(426	)	$	(1,983	)

(a) Cash equivalents are primarily composed of money market investments.

(b) In the Consolidated Balance Sheet amounts are presented as a net liability. See Note 10.

Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation

The following tables present the Company’s activity for items measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for 2015 and 2014:

	Fair value measurements using significant unobservable inputs (Level 3)
	Fuel				Other
(in millions)	derivatives				securities			Total
Balance at December 31, 2014	$	(1,091	)		$	32		$	(1,059	)
Total losses (realized or unrealized)
Included in earnings	(646		)		(1		)	(647		)
Included in other comprehensive income	(858		)		—			(858		)
Purchases	750			(a)	—			750
Sales	(196		)	(a)	(4		)	(200		)
Settlements	365				—			365
Balance at December 31, 2015	$	(1,676	)		$	27		$	(1,649	)
The amount of total losses for the period   included in earnings attributable to the   change in unrealized gains or losses relating   to assets still held at December 31, 2015	$	(428	)		$	—		$	(428	)

(a) The purchase and sale of fuel derivatives are recorded gross based on the structure of the derivative instrument and

whether a contract with multiple derivatives is purchased as a single instrument or separate instruments.

	Fair value measurements using significant unobservable inputs (Level 3)
	Fuel				Other
(in millions)	derivatives				securities			Total
Balance at December 31, 2013	$	172			$	44		$	216
Total gains or (losses) (realized or unrealized)
Included in earnings	(439		)		—			(439		)
Included in other comprehensive income	(1,091		)		3			(1,088		)
Purchases	403			(a)	—			403
Sales	(155		)	(a)	(15		)	(170		)
Settlements	19				—			19
Balance at December 31, 2014	$	(1,091	)		$	32		$	(1,059	)
The amount of total losses for the period   included in earnings attributable to the   change in unrealized gains or losses relating   to assets still held at December 31, 2014	$	(450	)		$	—		$	(450	)

(a) The purchase and sale of fuel derivatives are recorded gross based on the structure of the derivative instrument and

whether a contract with multiple derivatives is purchased as a single instrument or separate instruments.

Fair Value Valuation Techniques

The following table presents a range of the unobservable inputs utilized in the fair value measurements of the Company’s fuel derivatives classified as Level 3 at December 31, 2015:

Quantitative information about Level 3 fair value measurements
	Valuation technique	Unobservable input	Period (by year)	Range
Fuel derivatives	Option model	Implied volatility	2016	26-47%
			2017	25-37%
			2018	16-31%

Fair value, by Balance Sheet Grouping

(in millions)	Carrying value		Estimated fair value		Fair value level hierarchy
5.75% Notes due 2016	$	307	$	319	Level 2
5.25% Convertible Senior Notes due 2016	111		324		Level 2
5.125% Notes due 2017	309		321		Level 2
French Credit Agreements due 2018 - 1.53%	25		25		Level 3
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02%	17		17		Level 3
2.75% Notes due 2019	303		307		Level 2
Term Loan Agreement due 2019 - 6.315%	143		147		Level 3
Term Loan Agreement due 2019 - 4.84%	36		37		Level 3
2.65% Notes due 2020	494		493		Level 2
Term Loan Agreement due 2020 - 5.223%	329		323		Level 3
Floating-rate 737 Aircraft Notes payable through 2020	257		253		Level 3
Pass Through Certificates due 2022 - 6.24%	340		382		Level 2
7.375% Debentures due 2027	132		154		Level 2

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Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2015

Equity [Abstract]

Rollforward of the Amounts Included in AOCI, Net of Taxes

A rollforward of the amounts included in AOCI, net of taxes, is shown below for 2015 and 2014:

(in millions)	Fuel derivatives			Interest rate derivatives			Defined benefit plan items			Other			Deferred tax impact		Accumulated other comprehensive income (loss)
Balance at December 31, 2013	$	(20	)	$	(58	)	$	65		$	8		$	2	$	(3	)
Changes in fair value	(1,191		)	(10		)	(24		)	—			454		(771		)
Reclassification to earnings	34			23			—			—			(21)		36
Balance at December 31, 2014	$	(1,177	)	$	(45	)	$	41		$	8		$	435	$	(738	)
Changes in fair value	(867		)	(5		)	(19		)	(2		)	329		(564		)
Reclassification to earnings	378			20			—			—			(147)		251
Balance at December 31, 2015	$	(1,666	)	$	(30	)	$	22		$	6		$	617	$	(1,051	)

Reclassification out of Accumulated Other Comprehensive Income

The following table illustrates the significant amounts reclassified out of each component of AOCI for the year endedDecember 31, 2015:

Year ended December 31, 2015
(in millions)	Amounts reclassified from AOCI		Affected line item in the Consolidated Statement of Comprehensive Income
AOCI components
Unrealized loss on fuel derivative instruments	$	378	Fuel and oil expense
	140		Less: Tax expense
	$	238	Net of tax
Unrealized loss on interest rate derivative instruments	$	20	Interest expense
	7		Less: Tax expense
	$	13	Net of tax
Total reclassifications for the period	$	251	Net of tax

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Employee Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Changes in Accumulated Postemployment Benefit Obligations

The following table shows the change in the accumulated postretirement benefit obligation (APBO) for the years ended December 31, 2015 and 2014:

(in millions)	2015			2014
APBO at beginning of period	$	169		$	138
Service cost	11			10
Interest cost	7			7
Benefits paid	(6		)	(4		)
Actuarial loss	20			21
Settlements	$	—		$	(3	)
APBO at end of period	$	201		$	169

Schedule of Amounts Recognized in Balance Sheet

The following table reconciles the funded status of the plans to the accrued postretirement benefit cost recognized in Other non-current liabilities on the Company’s Consolidated Balance Sheet at December 31, 2015 and 2014.

(in millions)	2015			2014
Funded status	$	(201	)	$	(169	)
Unrecognized net actuarial gain	(31		)	(53		)
Unrecognized prior service cost	9			12
Accumulated other comprehensive income	22			41
Cost recognized on Consolidated Balance Sheet	$	(201	)	$	(169	)

Schedule of Net Benefit Costs

The consolidated periodic postretirement benefit cost for the years ended December 31, 2015, 2014, and 2013, included the following:

(in millions)	2015			2014			2013
Service cost	$	11		$	10		$	30
Interest cost	7			7			4
Amortization of prior service cost	3			3			3
Recognized actuarial gain	(3		)	(4		)	(4		)
Settlements	$	—		$	(1	)	$	—
Net periodic postretirement benefit cost	$	18		$	15		$	33

Schedule of Assumptions Used

The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31,2015, 2014, and 2013:

	2015		2014		2013
Weighted-average discount rate	4.50	%	4.10	%	5.05	%
Assumed healthcare cost trend rate (1)	7.08	%	6.88	%	7.50	%

(1) The assumed healthcare cost trend rate is assumed to remain at 7.08% for 2016, then decline gradually to 5.19% by 2026 and remain level thereafter.

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

The assumed healthcare cost trend rates have a significant effect on the amounts reported for the consolidated postretirement plans. A one percent change in all healthcare cost trend rates used in measuring the APBO at December 31, 2015, would have the following effects:

(in millions)	1% increase		1% decrease
Increase (decrease) in total service and interest costs	$	3	$	(2	)
Increase (decrease) in the APBO	$	29	$	(24	)

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Components of Deferred Tax Assets and Liabilities

The components of deferred tax assets and liabilities at December 31, 2015 and 2014, are as follows:

(in millions)	2015		2014
DEFERRED TAX LIABILITIES:
Accelerated depreciation	$	4,429	$	4,277
Other	62		51
Total deferred tax liabilities	4,491		4,328
DEFERRED TAX ASSETS:
Fuel derivative instruments	750		521
Capital and operating leases	81		125
Construction obligation	289		209
Accrued engine maintenance	74		83
Accrued employee benefits	541		334
State taxes	62		65
Business partner income	107		90
Other	97		119
Total deferred tax assets	2,001		1,546
Net deferred tax liability	$	2,490	$	2,782

Components of the Income Tax Provision

The provision for income taxes is composed of the following:

(in millions)	2015			2014		2013
CURRENT:
Federal	$	1,292		$	203	$	355
State	114			29		44
Total current	1,406			232		399
DEFERRED:
Federal	(97		)	421		62
State	(11		)	27		(6		)
Total deferred	(108		)	448		56
	$	1,298		$	680	$	455

Income Tax Provision Reconciliation To Federal Income Tax Statutory Rate

The effective tax rate on income before income taxes differed from the federal income tax statutory rate for the following reasons:

(in millions)	2015			2014			2013
Tax at statutory U.S. tax rates	$	1,218		$	636		$	423
Nondeductible items	15			9			10
State income taxes, net of federal benefit	66			37			25
Other, net	(1		)	(2		)	(3		)
Total income tax provision	$	1,298		$	680		$	455

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Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Data [Abstract]

Schedule of Quarterly Financial Information

	Three months ended
(in millions except per share amounts)	March 31		June 30		Sept. 30		Dec. 31
2015
Operating revenues (a)(b)	$	4,414	$	5,111	$	5,318	$	4,977
Operating income	780		1,085		1,225		1,026
Income before income taxes	723		977		933		847
Net income	453		608		584		536
Net income per share, basic (a)(b)	0.67		0.91		0.89		0.83
Net income per share, diluted (a)(b)	0.66		0.90		0.88		0.82
	March 31		June 30		Sept. 30		Dec. 31
2014
Operating revenues (a)	$	4,166	$	5,011	$	4,800	$	4,628
Operating income	215		775		614		621
Income before income taxes	244		746		525		302
Net income	152		465		329		190
Net income per share, basic (a)	0.22		0.67		0.48		0.28
Net income per share, diluted (a)	0.22		0.67		0.48		0.28

(a) Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $43 million, $41 million, and $30 million, and increased both Basic and Diluted net income per share by approximately $.03, $.03, and $.02 for first, second, and third quarters of 2015, respectively. Also, as a result, fourth quarter 2014 Passenger revenues increased by approximately $55 million and both Basic and Diluted net income per share for the period increased by $.04. See Note 1 for further detail.

(b) Includes the impact of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The impact of this change during third quarter and fourth quarter 2015 resulted in increases to Operating revenue of approximately $303 million and $124 million, and increased both Basic and Diluted net income per share by approximately $.24 and $.10, respectively. See Note 1 for further detail.

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Summary of Significant Accounting Policies (Details) - USD ($)		3 Months Ended					12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Prior Period Reclassification Adjustment							$ 477,000,000
Inventory reserve for obsolescence		$ 47,000,000				$ 46,000,000	47,000,000	$ 46,000,000
Frequent flyer points and flight credits liability		1,300,000,000					1,300,000,000
Capitalized computer software, net		$ 378,000,000				403,000,000	378,000,000	403,000,000
Computer software depreciation expense							106,000,000	122,000,000	$ 90,000,000
Advertising costs							$ 218,000,000	207,000,000	208,000,000
Concentration Risk [Line Items]
The percentage of employees subject to amendable agreements in the current year (in hundredths)		69.00%					69.00%
Change in Accounting Estimate [Line Items]
Special revenue adjustment							$ 172,000,000	0	0
Change In Accounting Estimate Financial Effect On Depreciation Expense 2016							89,000,000
Change in Accounting Estimate Financial Effect on Passenger Revenue			$ 30,000,000	$ 41,000,000	$ 43,000,000	$ 55,000,000	115,000,000	55,000,000
Change in accounting estimate, financial effect on net income, spoilage adjustment							$ 61,000,000	$ 29,000,000
Change in accounting estimate,financial effect on earnings per share			$ 0.02	$ 0.03	$ 0.03	$ 0.04	$ 0.09	$ 0.04
Change On Operating Revenue Net of Special Revenue Adjustment							$ 255,000,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Revenue		$ 124,000,000	$ 303,000,000				427,000,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income							$ 227,000,000
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share		$ 0.10	$ 0.24				$ 0.34
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Diluted Earnings Per Share							0.34
Change in accounting estimate, financial effect on earnings per share diluted							$ 0.09	$ 0.04
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 574,000,000				$ 456,000,000	$ 574,000,000	$ 456,000,000
Weighted-average useful life (in years)							15 years
Accumulated amortization		110,000,000				93,000,000	$ 110,000,000	93,000,000
Amortization of intangible assets							19,000,000	13,000,000	$ 19,000,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2015		17,000,000					17,000,000
2016		14,000,000					14,000,000
2017		13,000,000					13,000,000
2018		13,000,000					13,000,000
2019		12,000,000					12,000,000
Thereafter		89,000,000					89,000,000
Fuel derivatives
Accounting Policies [Abstract]
Total collateral already posted aggregate fair value		835,000,000				266,000,000	835,000,000	266,000,000
Other Noncurrent Liabilities | Fuel derivatives
Property, Plant and Equipment [Line Items]
Collateral Already Posted, Aggregate Fair Value		600,000,000				198,000,000	600,000,000	198,000,000
Other Noncurrent Liabilities | Interest rate derivatives
Property, Plant and Equipment [Line Items]
Collateral Already Posted, Aggregate Fair Value		0				0	$ 0	0
Flight equipment
Property, Plant and Equipment [Line Items]
Minimum percentage of cost estimated residual value (in hundredths)							2.00%
Maximum percentage of cost estimated as residual value (in hundredths)							20.00%
Flight equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment Useful Life							23 years
Flight equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment Useful Life							25 years
Property, Plant and Equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment Useful Life							5 years
Property, Plant and Equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment Useful Life							30 years
Ground property and equipment
Property, Plant and Equipment [Line Items]
Minimum percentage of cost estimated residual value (in hundredths)							0.00%
Maximum percentage of cost estimated as residual value (in hundredths)							10.00%
AssetsConstructedForOthers
Property, Plant and Equipment [Line Items]
Minimum percentage of cost estimated residual value (in hundredths)							17.00%
Maximum percentage of cost estimated as residual value (in hundredths)							25.00%
AssetsConstructedForOthers | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment Useful Life							25 years
AssetsConstructedForOthers | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment Useful Life							30 years
Software | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment Useful Life							5 years
Software | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment Useful Life							15 years
Passenger Revenue
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Current Period Disclosures, Revenue Recognized, Amount							$ (89,000,000)
Other Revenue [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Current Period Disclosures, Revenue Recognized, Amount							344,000,000
Special Revenue Adjustment [Member]
Change in Accounting Estimate [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Current Period Disclosures, Revenue Recognized, Amount							172,000,000
Customer relationships/marketing agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of finite-lived intangible assets		38,000,000				38,000,000	$ 38,000,000	38,000,000
Weighted-average useful life (in years)							9 years
Accumulated amortization		30,000,000				26,000,000	$ 30,000,000	26,000,000
Trademarks/trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of finite-lived intangible assets		36,000,000				36,000,000	$ 36,000,000	36,000,000
Weighted-average useful life (in years)							6 years
Accumulated amortization		34,000,000				30,000,000	$ 34,000,000	30,000,000
Owned domestic slots
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of indefinite-lived intangible assets	[1]	303,000,000				303,000,000	303,000,000	303,000,000
Contract-Based Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of finite-lived intangible assets	[2]	17,000,000				19,000,000	$ 17,000,000	19,000,000
Weighted-average useful life (in years)	[2]						47 years
Accumulated amortization	[2]	3,000,000				5,000,000	$ 3,000,000	5,000,000
Gate leasehold rights (a)
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of finite-lived intangible assets		180,000,000				60,000,000	$ 180,000,000	60,000,000
Weighted-average useful life (in years)							15 years
Accumulated amortization		$ 43,000,000				$ 32,000,000	$ 43,000,000	$ 32,000,000
Unionized Employees concentration risk
Concentration Risk [Line Items]
The percentage of Company's employees that are unionized and covered by collective bargaining agreements (in hundredths)							83.00%

[1] Intangible assets primarily consist of acquired leasehold rights to certain airport owned gates at Chicago’s Midway International Airport, takeoff and landing slots (a “slot” is the right of an air carrier, pursuant to regulations of the Federal Aviation Administration (“FAA”), to operate a takeoff or landing at a specific time at certain airports) at certain domestic slot-controlled airports, and certain intangible assets recognized from the AirTran acquisition. The increase in Intangible assets during 2015 was primarily due to the acquisition of two additional airport gate rights at Dallas Love Field, which were subleased from United Airlines. The purchase price paid for these airport gate rights was included as a component of Capital expenditures in the accompanying Consolidated Statement of Cash Flows.

[2] Useful life of leased slots is based on the stated lease term.

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Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
NUMERATOR:
Net income	$ 536	$ 584		$ 608		$ 453		$ 190		$ 329	$ 465	$ 152	$ 2,181	$ 1,136	$ 754
Incremental income effect of interest on 5.25% convertible notes													4	4	3
Net income after assumed conversion													$ 2,185	$ 1,140	$ 757
DENOMINATOR:
Weighted-average shares outstanding, basic													661	687	710
Dilutive effect of Employee stock options and restricted stock units													2	3	2
Dilutive effect of 5.25% convertible notes													6	6	6
Adjusted weighted-average shares outstanding, diluted													669	696	718
NET INCOME PER SHARE:
Basic (in dollars per share)	$ 0.83	$ 0.89	[1],[2]	$ 0.91	[1],[2]	$ 0.67	[1],[2]	$ 0.28	[1]	$ 0.48	$ 0.67	$ 0.22	$ 3.30	$ 1.65	$ 1.06
Diluted (in dollars per share)	$ 0.82	$ 0.88	[1]	$ 0.90	[1]	$ 0.66	[1]	$ 0.28	[1]	$ 0.48	$ 0.67	$ 0.22	$ 3.27	$ 1.64	$ 1.05
Stock Options
Potentially dilutive amounts excluded from calculations:
Potentially dilutive amounts excluded from calculations:													0	0	9

[1] Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $43 million, $41 million, and $30 million, and increased both Basic and Diluted net income per share by approximately $.03, $.03, and $.02 for first, second, and third quarters of 2015, respectively. Also, as a result, fourth quarter 2014 Passenger revenues increased by approximately $55 million and both Basic and Diluted net income per share for the period increased by $.04. See Note 1 for further detail.

[2] Includes the impact of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The impact of this change during third quarter and fourth quarter 2015 resulted in increases to Operating revenue of approximately $303 million and $124 million, and increased both Basic and Diluted net income per share by approximately $.24 and $.10, respectively. See Note 1 for further detail.

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Net Income Per Share Parenthetical (Details)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Convertible Debt | 5.25% Convertible Senior Notes due 2016
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)	5.25%	5.25%	5.25%

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COMMITMENTS AND CONTINGENCIES Long-term Purchase Commitments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) aircraft
Long-term Purchase Commitment [Line Items]
Additional Options	6
Additional - Pre Owned 700 A/C (in units)	2
Conversion - 737 NG 700 to 737 NG 800 firm orders	25
Additional 737 NG 800 Options	33
Options - 737NG (in units)	18
Additional - 700 A/C (in units)	35	[1]
Options - 737MAX (in units)	191
Total	533
Firm - 737NG 800 (in units)	89
Firm - 737MAX (in units)	30
Firm - 738MAX (in units)	170	[2]
2016
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	17
Options - 737MAX (in units)	0
Total	53
Firm - 737NG 800 (in units)	36
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	0
2017
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	14
Options - 737MAX (in units)	0
Total	63
Firm - 737NG 800 (in units)	35
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	14
2018
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	18
Additional - 700 A/C (in units)	4
Options - 737MAX (in units)	0
Total	53
Firm - 737NG 800 (in units)	18
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	13
2019
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	0
Total	25
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	15
Firm - 738MAX (in units)	10
2020
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	0
Total	36
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	14
Firm - 738MAX (in units)	22
2021
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	18
Total	52
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	1
Firm - 738MAX (in units)	33
2022
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	19
Total	49
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	30
2023
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	23
Total	47
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	24
2024
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	23
Total	47
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	24
2025
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	36
Total	36
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	0
2026
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	36
Total	36
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	0
2027
Long-term Purchase Commitment [Line Items]
Options - 737NG (in units)	0
Additional - 700 A/C (in units)	0
Options - 737MAX (in units)	36
Total	36
Firm - 737NG 800 (in units)	0
Firm - 737MAX (in units)	0
Firm - 738MAX (in units)	0
Aircraft [Member]
Long-term Purchase Commitment [Line Items]
Committed expenditures, 2016 | $	$ 1,100
Committed expenditures, 2017 | $	1,300
Committed expenditures, 2018 | $	1,100
Committed expenditures, 2019 | $	1,200
Committed expenditures, 2020 | $	1,500
Committed expenditures, 2021 and beyond | $	$ 4,400
B-737-800
Long-term Purchase Commitment [Line Items]
Number of Aircrafts Purchased	19
B-737-700
Long-term Purchase Commitment [Line Items]
Number of Aircrafts Purchased	8
Number of aircrafts leased	16
B737-300
Long-term Purchase Commitment [Line Items]
Number of aircrafts retired from service	2
B737-500
Long-term Purchase Commitment [Line Items]
Number of aircrafts retired from service	2

[1] To be acquired in leases from various third parties.

[2] The Company has flexibility to substitute MAX 7 in lieu of MAX 8 firm orders beginning in 2019.

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Commitments and Contingencies (Details)	3 Months Ended		12 Months Ended
	Jun. 30, 2012 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2015 USD ($) aircraft	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Airport Project [Line Items]
Assets constructed for others			$ 915,000,000	$ 621,000,000
Depreciation and amortization			1,015,000,000	$ 938,000,000	$ 867,000,000
LAX
Airport Project [Line Items]
Expected total airport modernization project cost			526,000,000
Assets constructed for others			196,000,000
FLL
Airport Project [Line Items]
Expected total airport modernization project cost			295,000,000
Assets constructed for others			25,000,000
DAL
Airport Project [Line Items]
Municipal bonds issued	$ 146,000,000	$ 310,000,000
Assets constructed for others			548,000,000
Airport construction obligation			536,000,000
Depreciation and amortization			36,000,000
HOU
Airport Project [Line Items]
Expected total airport modernization project cost			156,000,000
Assets constructed for others			$ 146,000,000
B-737-800
Airport Project [Line Items]
Number of Aircrafts Purchased | aircraft			19
B-737-700
Airport Project [Line Items]
Number of Aircrafts Purchased | aircraft			8
Number of aircrafts leased | aircraft			16
B737-300
Airport Project [Line Items]
Number of aircrafts retired from service | aircraft			2
B737-500
Airport Project [Line Items]
Number of aircrafts retired from service | aircraft			2

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Supplemental Financial Information - Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Other Assets [Abstract]
Intangible assets	$ 464	$ 363
Non-current investments	40	35
Other	213	136
Other assets	$ 717	$ 534

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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Accounts Payable [Abstract]
Accounts payable trade	$ 178	$ 123
Salaries payable	173	160
Taxes payable	179	163
Aircraft maintenance payable	168	314
Fuel payable	48	85
Other payable	442	358
Accounts payable	$ 1,188	$ 1,203

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Supplemental Financial Information - Accrued Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2015		Dec. 31, 2014
Supplemental Financial Data [Line Items]
Profitsharing and savings plans		$ 655		$ 374
Aircraft and other lease related obligations		74		159
Vacation pay		309		292
Accrued Union Bonuses		329	[1]	9
Health		86		84
Workers compensation		187		165
Property and other taxes		62		81
Other		246		227
Accrued liabilities		2,591		1,565
Fuel derivatives | Accrued Liabilities
Supplemental Financial Data [Line Items]
Derivative Contracts	[2]	$ 643		$ 174

[1] As part of the ongoing negotiations with various union contract groups during 2015, the Company has recorded a liability for estimated bonuses that would be paid out to union members upon ratification of labor agreements. The liability excludes certain immaterial benefit costs that are included as a component of Accounts payable. The amount accrued is subject to change based on subsequent negotiations, and any changes would be recorded on a prospective basis.

[2] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Other Liabilities, Noncurrent [Abstract]
Postretirement obligation		$ 201	$ 169
Non-current lease-related obligations		165	193
Other deferred compensation		179	174
Deferred gains from sale and leaseback of aircraft		43	53
Other		98	44
Other non-current liabilities		760	1,255
Other Noncurrent Liabilities
Other Liabilities, Noncurrent [Abstract]
Derivative contracts		74	622
Other Noncurrent Liabilities | Interest Rate Swap
Other Liabilities, Noncurrent [Abstract]
Derivative contracts	[1]	$ 49	$ 61

[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

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Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Nov. 06, 2014	Dec. 31, 2013	Oct. 31, 2009	Jul. 01, 2009	Apr. 29, 2009	May. 06, 2008	Dec. 31, 2006	Feb. 28, 2005	Feb. 28, 1997
Debt Instrument [Line Items]
Total	$ 3,198	$ 2,713
Less current maturities	637	258
Less debt discount and issuance costs	20	21
Long-term debt less current maturities	2,541	2,434
Capital Lease Obligations
Debt Instrument [Line Items]
Total	395	199
5.75% Notes due 2016
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)									5.75%
5.75% Notes due 2016 | Unsecured Debt
Debt Instrument [Line Items]
Total	$ 307	$ 313
Interest rate stated in the debt agreement (in hundredths)	5.75%
5.25% Convertible Senior Notes due 2016 | AirTran Airways
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)					5.25%
5.25% Convertible Senior Notes due 2016 | Convertible Debt
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)	5.25%	5.25%		5.25%
5.25% Convertible Senior Notes due 2016 | Convertible Debt | AirTran Airways
Debt Instrument [Line Items]
Total	$ 111	$ 113
Interest rate stated in the debt agreement (in hundredths)	5.25%
5.125% Notes due 2017
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)										5.125%
5.125% Notes due 2017 | Unsecured Debt
Debt Instrument [Line Items]
Total	$ 309	316
Interest rate stated in the debt agreement (in hundredths)	5.125%
French Credit Agreements due 2018 - 1.53% | Notes Payable to Banks
Debt Instrument [Line Items]
Total	$ 25	36
Interest rate stated in the debt agreement (in hundredths)	1.53%
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% | Notes Payable to Banks | AirTran Airways
Debt Instrument [Line Items]
Total	$ 17	24
Interest rate stated in the debt agreement (in hundredths)	7.02%
2.75% Unsecured Senior Notes Due 2019
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)			2.75%
2.75% Unsecured Senior Notes Due 2019 | Unsecured Debt
Debt Instrument [Line Items]
Total	$ 303	300
Interest rate stated in the debt agreement (in hundredths)	2.75%
Term Loan Agreement due 2019 - 6.315%
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)							6.315%
Term Loan Agreement due 2019 - 6.315% | Notes Payable to Banks
Debt Instrument [Line Items]
Total	$ 143	178
Interest rate stated in the debt agreement (in hundredths)	6.315%
Term Loan Agreement due 2019 - 4.84%
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)						4.84%
Term Loan Agreement due 2019 - 4.84% | Notes Payable to Banks
Debt Instrument [Line Items]
Total	$ 36	73
Interest rate stated in the debt agreement (in hundredths)	4.84%
2.65% Notes due 2020
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)	2.65%
2.65% Notes due 2020 | Unsecured Debt
Debt Instrument [Line Items]
Total	$ 494	0
Interest rate stated in the debt agreement (in hundredths)	2.65%
Term Loan Agreement due 2020 - 5.223%
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)								5.223%
Term Loan Agreement due 2020 - 5.223% | Notes Payable to Banks
Debt Instrument [Line Items]
Total	$ 329	372
Interest rate stated in the debt agreement (in hundredths)	5.223%
Floating-rate 737 Aircraft Notes payable through 2020 | Notes Payable to Banks | AirTran Airways
Debt Instrument [Line Items]
Total	$ 257	300
Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Total	$ 340	355
Interest rate stated in the debt agreement (in hundredths)	6.24%
7.375% Debentures due 2027
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)											7.375%
7.375% Debentures due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Total	$ 132	$ 134
Interest rate stated in the debt agreement (in hundredths)	7.375%

XML

Long-term Debt (Details)				1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 29, 2009 USD ($) Mortgages	May. 06, 2008 USD ($) Mortgages	Feb. 28, 1997 USD ($)	Oct. 31, 2009 USD ($) $ / shares shares	Dec. 31, 2004 USD ($) Mortgages Agreements	Dec. 31, 2015 USD ($) aircraft Mortgages	Dec. 31, 2014 USD ($)	Nov. 06, 2014 USD ($)	Jul. 01, 2009 USD ($) Mortgages	Oct. 03, 2007 USD ($) Mortgages	Dec. 31, 2006 USD ($)	Feb. 28, 2005 USD ($)
Debt Instrument [Line Items]
Encumbered Aircraft Released | aircraft						1
Encumbered Aircraft Remaining | aircraft						4
Letters of Credit Outstanding Amount						$ 184,000,000
Net book value of assets pledged as collateral for the Company's secured borrowings, primarily aircraft and engines						2,000,000,000
Net book value of additional assets pledged as collateral in case obligations related to fuel derivatives exceed certain thresholds						2,500,000,000.0
Long-term Debt, by Maturity [Abstract]
2016						617,000,000
2017						528,000,000
2018						272,000,000
2019						522,000,000
2020						751,000,000
Thereafter						424,000,000
AirTran Airways | Interest rate derivatives
Debt Instrument [Line Items]
Notional amount						$ 208,000,000
AirTran Airways | Maximum | Interest rate derivatives
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)						6.435%
Floating-rate 737 Aircraft Notes payable through 2020 | AirTran Airways
Debt Instrument [Line Items]
Number of mortgages on secured aircraft | Mortgages						19
Weighted average interest rate						1.86%
Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% | AirTran Airways
Debt Instrument [Line Items]
Number of mortgages on secured aircraft | aircraft						3
Weighted average interest rate						7.02%
5.25% Convertible Senior Notes due 2016
Debt Instrument [Line Items]
Conversion ratio | shares				54.1391
Conversion price | $ / shares				$ 615.16
5.25% Convertible Senior Notes due 2016 | AirTran Airways
Debt Instrument [Line Items]
Face amount of debt				$ 115,000,000
Interest rate stated in the debt agreement (in hundredths)				5.25%
Conversion ratio | shares				168.6576
Extinguishment of debt amount						$ 5,000,000
Repurchase price percentage						100.00%
Conversion option, amount							$ 35,000,000
Unamortized premium							$ 10,000,000
2.65% Notes due 2020
Debt Instrument [Line Items]
Face amount of debt						$ 500,000,000
Interest rate stated in the debt agreement (in hundredths)						2.65%
2.75% Unsecured Senior Notes Due 2019
Debt Instrument [Line Items]
Face amount of debt								$ 300,000,000
Interest rate stated in the debt agreement (in hundredths)								2.75%
Term Loan Agreement due 2019 - 4.84%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft | Mortgages									5
Interest rate stated in the debt agreement (in hundredths)									4.84%
Debt Instrument, Prepayment Amount									$ 24,000,000
Term Loan Agreement due 2019 - 4.84% | Maximum
Debt Instrument [Line Items]
Face amount of debt									$ 124,000,000
Term Loan Agreement due 2019 - 6.315%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft | Mortgages	14
Interest rate stated in the debt agreement (in hundredths)	6.315%
Term Loan Agreement due 2019 - 6.315% | LIBOR
Debt Instrument [Line Items]
Spread on variable rate	3.30%
Term Loan Agreement due 2019 - 6.315% | Maximum
Debt Instrument [Line Items]
Face amount of debt	$ 332,000,000
Term Loan Agreement due 2020 - 5.223%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft | Mortgages		21
Face amount of debt		$ 600,000,000
Interest rate stated in the debt agreement (in hundredths)		5.223%
Term Loan Agreement due 2020 - 5.223% | LIBOR
Debt Instrument [Line Items]
Spread on variable rate		0.95%
Pass Through Certificates due 2022 - 6.24%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft | Mortgages										16
Face amount of debt										$ 500,000,000
Pass Through Certificates due 2022 - 6.24% | Interest rate derivatives | Cash Flow Hedging
Debt Instrument [Line Items]
Notional amount										20,000,000
Pass Through Certificates Series A
Debt Instrument [Line Items]
Face amount of debt										$ 412,000,000
Interest rate stated in the debt agreement (in hundredths)										6.15%
Pass Through Certificates Series B
Debt Instrument [Line Items]
Face amount of debt										$ 88,000,000
Interest rate stated in the debt agreement (in hundredths)										6.65%
5.75% Notes due 2016
Debt Instrument [Line Items]
Face amount of debt											$ 300,000,000
Interest rate stated in the debt agreement (in hundredths)											5.75%
5.125% Notes due 2017
Debt Instrument [Line Items]
Face amount of debt												$ 300,000,000
Interest rate stated in the debt agreement (in hundredths)												5.125%
French Credit Agreements due 2018 - 1.53%
Debt Instrument [Line Items]
Number of mortgages on secured aircraft | Mortgages					4
Face amount of debt					$ 112,000,000
Number of identical floating rate financing agreements entered into concurrently with French banking partnerships | Agreements					4
Term					13 years
French Credit Agreements due 2018 - 1.53% | LIBOR
Debt Instrument [Line Items]
Spread on variable rate					(0.45%)
7.375% Debentures due 2027
Debt Instrument [Line Items]
Face amount of debt			$ 100,000,000
Interest rate stated in the debt agreement (in hundredths)			7.375%
7.375% Debentures due 2027 | Treasury Rate
Debt Instrument [Line Items]
Spread on variable rate			20.00%
Enhanced Equipment Trust Certificate | Pass Through Certificates due 2022 - 6.24%
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)						6.24%
B-737-700
Debt Instrument [Line Items]
Maximum additional number of assets pledged as collateral in case obligations related to fuel derivatives exceed certain thresholds | aircraft						88
B-737-800
Debt Instrument [Line Items]
Maximum additional number of assets pledged as collateral in case obligations related to fuel derivatives exceed certain thresholds | aircraft						12

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Leases (Details)		3 Months Ended		12 Months Ended
		Dec. 31, 2015 USD ($) aircraft CapitalLeases	Sep. 30, 2013 USD ($)	Dec. 31, 2015 USD ($) aircraft CapitalLeases	Dec. 31, 2014 USD ($) CapitalLeases	Dec. 31, 2013 USD ($)	Jul. 09, 2012 aircraft
Capital Leases, Balance Sheet, Assets by Major Class, Net [Abstract]
Flight equipment		$ 435,000,000		$ 435,000,000	$ 214,000,000
Less: accumulated amortization		29,000,000		29,000,000	22,000,000
Total		406,000,000		406,000,000	$ 192,000,000
Capital Leased Assets [Line Items]
2016		46,000,000		46,000,000
2017		46,000,000		46,000,000
2018		45,000,000		45,000,000
2019		45,000,000		45,000,000
2020		44,000,000		44,000,000
Thereafter		209,000,000		209,000,000
Total minimum lease payments		435,000,000		435,000,000
Less amount representing interest		79,000,000		79,000,000
Present value of minimum lease payments		356,000,000		356,000,000
Less current portion		32,000,000		32,000,000
Long-term portion		$ 324,000,000		$ 324,000,000
Number of capital leased assets | CapitalLeases		28		28	16
Rental expense for operating leases				$ 909,000,000	$ 931,000,000	$ 997,000,000
Number of operating leased assets | aircraft		95		95
Subleases
2016		$ (103,000,000)		$ (103,000,000)
2017		(103,000,000)		(103,000,000)
2018		(102,000,000)		(102,000,000)
2019		(97,000,000)		(97,000,000)
2020		(78,000,000)		(78,000,000)
Thereafter		(66,000,000)		(66,000,000)
Total minimum lease payments		(549,000,000)		(549,000,000)
Operating leases
2016		557,000,000		557,000,000
2017		545,000,000		545,000,000
2018		474,000,000		474,000,000
2019		407,000,000		407,000,000
2020		307,000,000		307,000,000
Thereafter		1,529,000,000		1,529,000,000
Total minimum lease payments		3,819,000,000		3,819,000,000
2016		636,000,000		636,000,000
2017		624,000,000		624,000,000
2018		551,000,000		551,000,000
2019		479,000,000		479,000,000
2020		359,000,000		359,000,000
Thereafter		961,000,000		961,000,000
Total minimum lease payments		3,610,000,000		$ 3,610,000,000
Minimum
Capital Leased Assets [Line Items]
Renewal term				1 year
Maximum
Capital Leased Assets [Line Items]
Renewal term				5 years
Love Field Airport
Operating leases
2016		24,000,000		$ 24,000,000
2017		24,000,000		24,000,000
2018		25,000,000		25,000,000
2019		25,000,000		25,000,000
2020		26,000,000		26,000,000
Thereafter		634,000,000		634,000,000
Total minimum lease payments		$ 758,000,000		$ 758,000,000
B-717-200
Capital Leased Assets [Line Items]
Number of capital leased assets | aircraft							2
Number of operating leased assets | aircraft							76
Number of aircrafts subleased | aircraft							88
Number of aircraft delivered to sublessee | aircraft		87		87
RemainingNumberOfAircraftToBeDeliveredToSublessee | aircraft		1		1
Number of owned assets | aircraft							10
Lease terms for owned aircraft		7 years
Contingent rental payment due		$ 0		$ 0
Residual value of leased properties		0		0
Estimated Loss On Sublease			$ 137,000,000
Sublease transaction costs	[1]			48,000,000	86,000,000
Sublease Obligations		$ 18,000,000		18,000,000	63,000,000	$ 122,000,000
Interest expense related to accretion				(1,000,000)	(5,000,000)
Additional Estimated Loss on Sublease				$ 2,000,000	22,000,000
Grounding Loss on Sublease					$ 9,000,000
B-717-200 | Minimum
Capital Leased Assets [Line Items]
Sublease terms		3 years
B-717-200 | Maximum
Capital Leased Assets [Line Items]
Sublease terms		8 years
B-717-200 | Direct Financing Lease [Member]
Capital Leased Assets [Line Items]
Number of aircraft delivered to sublessee | aircraft		2		2
B-717-200 | Sales Type Lease [Member]
Capital Leased Assets [Line Items]
Number of aircraft delivered to sublessee | aircraft		9		9
B-717-200 | Operating Lease [Member]
Capital Leased Assets [Line Items]
Number of aircraft delivered to sublessee | aircraft		76		76

[1] Includes lease conversion cost payments

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LEASES Sublease Table (Details) - B-717-200 - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
B717 Sublease Liability [Line Items]
Sublease Obligations		$ 18	$ 63	$ 122
Interest Expense, Accretion		1	5
Sublease Transaction Costs	[1]	(48)	(86)
Additional Estimated Loss on Sublease		$ 2	$ 22

[1] Includes lease conversion cost payments

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Common Stock (Details) shares in Millions	Dec. 31, 2015 shares
Equity [Abstract]
Common stock reserved for issuance pursuant to Employee stock benefit plans (in shares)	60
Common stock reserved for issuance and not granted pursuant to Employee stock benefit plans (in shares)	33

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Stock Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Employee service share based compensation aggregate disclosures [Abstract]
Share based compensation cost	$ 29,000,000		$ 21,000,000		$ 18,000,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	0
Total unrecognized compensation cost related to share-based compensation arrangements	$ 34,000,000
Weighted average period of time over which unrecognized compensation cost is to be recognized (years)	1 year 10 months 24 days
The remaining number of RSU's or stock options that may be issued (in shares)	33,000,000
Employee stock purchase plan [Abstract]
The remaining balance of shares originally authorized for issue under the employee stock purchase plan (in shares)	10,000,000
The percentage of market value at which shares may be issued to participating employees (in hundredths)	90.00%
The number of shares issued to participants under the plan during the period	597,000		800,000		1,500,000
The weighted average fair value of each purchase right under the employee stock purchase plan (in dollars per share)	$ 36.40		$ 23.17		$ 12.03
The discount percentage off the market value for the employee stock purchase plan (in hundredths)	10.00%
The aggregate cost of the discount from the market value on shares issued to employees at the end of each monthly purchase period	$ 4.04		$ 2.68		$ 1.34
Board of Directors
Employee service share based compensation aggregate disclosures [Abstract]
Non-option equity instruments granted (in shares)	28,000		36,000		63,000
Weighted average price of non-option equity instruments granted	$ 41.27		$ 24.91		$ 14.34
RSUs
Employee service share based compensation aggregate disclosures [Abstract]
Vesting periods for plans			3 years
The remaining number of RSU's or stock options that may be issued (in shares)	23,000,000
Units (000)
Outstanding RSU's - beginning balance (in shares)	2,077,000		2,584,000		2,876,000
Granted (in shares)	561,000	[1]	834,000	[2]	1,139,000
Vested (in shares)	(1,095,000)		(1,239,000)		(1,263,000)
Surrendered (in shares)	(58,000)		(102,000)		(168,000)
Outstanding RSU's - ending balance (in shares)	1,485,000		2,077,000		2,584,000
Wtd. Average Fair Value (per share)
Weighted average grant date fair value RSU's - beginning balance (in dollars per share)	$ 16.92		$ 11.38		$ 9.57
Weighted average grant date fair value RSU's - granted (in dollars per share)	45.80		24.93		14.34
Weighted average grant date fair value RSU's - vested (in dollars per share)	13.33		11.05		10.24
Weighted average grant date fair value RSU's - surrendered (in dollars per share)	25.49		13.18		9.11
Weighted average grant date fair value RSU's - period end (in dollars per share)	$ 30.17		$ 16.92		$ 11.38
Performance Shares
Units (000)
Granted (in shares)	183,000		198,000
Stock Options
Options (000)
Outstanding - ending balance (in shares)	822,000
Wtd. average exercise price
Weighted average exercise price - ending balance (in dollars per share)	$ 13.44
Minimum | Performance Shares
Employee service share based compensation aggregate disclosures [Abstract]
Percentage of PBRSUs to be granted	0.00%
Maximum | Performance Shares
Employee service share based compensation aggregate disclosures [Abstract]
Percentage of PBRSUs to be granted	200.00%

[1] Includes 183 thousand shares of PBRSUs

[2] Includes 198 thousand shares of PBRSUs

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Financial Derivative Instruments Narrative (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 06, 2014	Apr. 29, 2009	May. 06, 2008	Dec. 31, 2006	Feb. 28, 1997
Derivative [Line Items]
Percent of fuel consumption hedged		15.00%
Premiums paid for fuel derivative contracts		$ 124,000,000	$ 62,000,000	$ 60,000,000
Current Unrealized Net Loss in OCI		620,000,000
Proceeds from termination of interest rate derivative instrument		12,000,000	0	$ 0
Maximum sum of derivatives of counterparty to be included in other (less than $10 million)		$ 10,000,000
Cash collateral provided as a percentage of derivative contract value (in hundredths)		100.00%
Derivative Asset, Fair Value, Gross Asset	[1]	$ 1,937,000,000	1,360,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	3,465,000,000	2,409,000,000
Term Loan Agreement due 2020 - 5.223%
Derivative [Line Items]
Face amount of debt							$ 600,000,000
Interest rate stated in the debt agreement (in hundredths)							5.223%
Term Loan Agreement due 2019 - 6.315%
Derivative [Line Items]
Interest rate stated in the debt agreement (in hundredths)						6.315%
Term Loan Agreement due 2019 - 6.315% | Maximum
Derivative [Line Items]
Face amount of debt						$ 332,000,000
7.375% Debentures due 2027
Derivative [Line Items]
Face amount of debt									$ 100,000,000
Interest rate stated in the debt agreement (in hundredths)									7.375%
2.75% Unsecured Senior Notes Due 2019
Derivative [Line Items]
Face amount of debt					$ 300,000,000
Interest rate stated in the debt agreement (in hundredths)					2.75%
5.75% Notes due 2016
Derivative [Line Items]
Face amount of debt								$ 300,000,000
Interest rate stated in the debt agreement (in hundredths)								5.75%
2.65% Notes due 2020
Derivative [Line Items]
Face amount of debt		$ 500,000,000
Interest rate stated in the debt agreement (in hundredths)		2.65%
Notes Payable to Banks | Term Loan Agreement due 2020 - 5.223%
Derivative [Line Items]
Face amount of debt		$ 600,000,000
Interest rate stated in the debt agreement (in hundredths)		5.223%
Notes Payable to Banks | Term Loan Agreement due 2019 - 6.315%
Derivative [Line Items]
Face amount of debt		$ 332,000,000
Interest rate stated in the debt agreement (in hundredths)		6.315%
Unsecured Debt | 7.375% Debentures due 2027
Derivative [Line Items]
Interest rate stated in the debt agreement (in hundredths)		7.375%
Unsecured Debt | 2.75% Unsecured Senior Notes Due 2019
Derivative [Line Items]
Face amount of debt		$ 300,000,000
Interest rate stated in the debt agreement (in hundredths)		2.75%
Average Floating Rate		1.27%
Unsecured Debt | 5.75% Notes due 2016
Derivative [Line Items]
Face amount of debt		$ 300,000,000
Interest rate stated in the debt agreement (in hundredths)		5.75%
Unsecured Debt | 2.65% Notes due 2020
Derivative [Line Items]
Face amount of debt		$ 500,000,000
Interest rate stated in the debt agreement (in hundredths)		2.65%
Average Floating Rate		1.94%
Fuel derivatives
Derivative [Line Items]
Total collateral already posted aggregate fair value		$ 835,000,000	266,000,000
Interest rate derivatives | AirTran Airways
Derivative [Line Items]
Notional amount		$ 208,000,000
Interest rate derivatives | AirTran Airways | Minimum
Derivative [Line Items]
Interest rate stated in the debt agreement (in hundredths)		4.35%
Interest rate derivatives | AirTran Airways | Maximum
Derivative [Line Items]
Interest rate stated in the debt agreement (in hundredths)		6.435%
Designated as Hedging Instrument
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	$ 168,000,000	13,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	1,233,000,000	704,000,000
Other Assets | Designated as Hedging Instrument | Fuel derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	2,000,000	0
Other Assets | Designated as Hedging Instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	2,000,000	$ 13,000,000
Other Liabilities | Designated as Hedging Instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 49,000,000
2016
Derivative [Line Items]
Percent of fuel consumption hedged		63.00%

[1] Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.

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Financial Derivative Instruments - Fuel Hedging (Details) gal in Millions	Dec. 31, 2015 gal	[1]
2016
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	1,226
2017
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	1,503
2018
Volume of Fuel Hedging [Line Items]
Fuel Hedged (in gallons)	731

[1] Due to the types of derivatives utilized by the Company and different price levels of those contracts, these volumes represent the maximum economic hedge in place and may vary significantly as market prices fluctuate.

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Financial Derivative Instruments - Fair Values by Balance Sheet Location (Details) - USD ($)		Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	$ 1,937,000,000	$ 1,360,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	3,465,000,000	2,409,000,000
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	168,000,000	13,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	1,233,000,000	704,000,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	1,769,000,000	1,347,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	2,232,000,000	1,705,000,000
Fuel derivatives | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		235,000,000	68,000,000
Due To Third Parties For Settled Fuel Contracts		46,000,000	16,000,000
Fuel derivatives | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		600,000,000	198,000,000
Fuel derivatives | Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	2,000,000	0
Derivative Asset, Fair Value, Gross Liability	[1]	0	0
Fuel derivatives | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	2,000,000	0
Derivative Asset, Fair Value, Gross Liability	[1]	0	0
Fuel derivatives | Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	526,000,000	0
Derivative Liability, Fair Value, Gross Asset	[1]	107,000,000	0
Fuel derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	658,000,000	643,000,000
Derivative Liability, Fair Value, Gross Asset	[1]	55,000,000	0
Fuel derivatives | Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	39,000,000	0
Derivative Asset, Fair Value, Gross Liability	[1]	26,000,000	0
Fuel derivatives | Not Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	5,000,000	0
Derivative Asset, Fair Value, Gross Liability	[1]	0	0
Fuel derivatives | Not Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	1,854,000,000	1,432,000,000
Derivative Liability, Fair Value, Gross Asset	[1]	1,395,000,000	1,190,000,000
Fuel derivatives | Not Designated as Hedging Instrument | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	352,000,000	273,000,000
Derivative Liability, Fair Value, Gross Asset	[1]	330,000,000	157,000,000
Interest rate derivatives | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Collateral Already Posted, Aggregate Fair Value		0	0
Interest rate derivatives | Designated as Hedging Instrument | Other Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	2,000,000	13,000,000
Derivative Asset, Fair Value, Gross Liability	[1]	0	0
Interest rate derivatives | Designated as Hedging Instrument | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	0	0
Derivative Liability, Fair Value, Gross Liability	[1]	49,000,000	$ 61,000,000
Interest rate derivatives | Designated as Hedging Instrument | Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 49,000,000

[1] Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.

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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Fuel derivatives | Prepaid expenses and other current assets
Offsetting Assets [Line Items]
Gross amounts of recognized assets		$ 41	$ 0
Gross amounts offset in the Balance Sheet		(26)	0
Net amounts of assets presented in the Balance Sheet (a)	[1]	15	0
Fuel derivatives | Other Assets
Offsetting Assets [Line Items]
Gross amounts of recognized assets		7	0
Gross amounts offset in the Balance Sheet		0	0
Net amounts of assets presented in the Balance Sheet (a)	[1]	7	0
Fuel derivatives | Accrued Liabilities
Offsetting Assets [Line Items]
Gross amounts of recognized assets		1,737	1,258
Gross amounts offset in the Balance Sheet		(1,737)	(1,258)
Net amounts of assets presented in the Balance Sheet (a)	[1]	0	0
Fuel derivatives | Other Noncurrent Liabilities
Offsetting Assets [Line Items]
Gross amounts of recognized assets		985	355
Gross amounts offset in the Balance Sheet		(985)	(355)
Net amounts of assets presented in the Balance Sheet (a)	[1]	0	0
Interest rate derivatives | Other Assets
Offsetting Assets [Line Items]
Gross amounts of recognized assets		2	13
Gross amounts offset in the Balance Sheet		0	0
Net amounts of assets presented in the Balance Sheet (a)	[1]	$ 2	$ 13

[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

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Financial Derivative Instruments - Offsetting of Derivative Liabilities (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Other Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Net amounts of liabilities presented in the Balance Sheet (a)		$ 74	$ 622
Fuel derivatives | Prepaid expenses and other current assets
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities		26	0
Gross amounts offset in the Balance Sheet		(26)	0
Net amounts of liabilities presented in the Balance Sheet (a)	[1]	0	0
Fuel derivatives | Accrued Liabilities
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities		2,380	1,432
Gross amounts offset in the Balance Sheet		(1,737)	(1,258)
Net amounts of liabilities presented in the Balance Sheet (a)	[1]	643	174
Fuel derivatives | Other Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities		1,010	916
Gross amounts offset in the Balance Sheet		(985)	(355)
Net amounts of liabilities presented in the Balance Sheet (a)	[1]	25	561
Interest rate derivatives | Other Noncurrent Liabilities
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities		49	61
Gross amounts offset in the Balance Sheet		0	0
Net amounts of liabilities presented in the Balance Sheet (a)	[1]	$ 49	$ 61

[1] The net amounts of derivative assets and liabilities are reconciled to the individual line item amounts presented in the Consolidated Balance Sheet in Note 5.

XML

Financial Derivative Instruments - (Gain) Loss by Hedging Relationship (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Gain) loss recognized in AOCI on derivatives (effective portion)		$ 550	$ 755
(Gain) loss reclassified from AOCI into income (effective portion)(a)	[1]	251	36
(Gain) loss recognized in income on derivatives (ineffective portion)(b)	[2]	(13)	3
Fuel derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Gain) loss recognized in AOCI on derivatives (effective portion)	[3]	546	749
(Gain) loss reclassified from AOCI into income (effective portion)(a)	[1],[3]	238	22
(Gain) loss recognized in income on derivatives (ineffective portion)(b)	[2]	(9)	7
Fuel derivatives | Not Designated as Hedging Instrument | Other Nonoperating Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
(Gain) loss recognized in income on derivatives		444	244
Interest rate derivatives | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
(Gain) loss recognized in AOCI on derivatives (effective portion)	[3]	4	6
(Gain) loss reclassified from AOCI into income (effective portion)(a)	[1],[3]	13	14
(Gain) loss recognized in income on derivatives (ineffective portion)(b)	[2]	$ (4)	$ (4)

[1] Amounts related to fuel derivative contracts and interest rate derivatives are included in Fuel and oil and Interest expense, respectively.

[2] Amounts are included in Other (gains) losses, net.

[3] Net of tax

XML

Financial Derivative Instruments - Fair Values of Fuel Derivatives Amounts Posted as Collateral (Details) - USD ($)		Dec. 31, 2015	Dec. 31, 2014
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Maximum Sum Of Derivatives Of Counterparty To Be Included In Other		$ 10,000,000
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Cash Collateral Percent Of Fair Value Fuel Derivatives Contracts		100.00%
Letter of Credit Percent of Collateral		100.00%
Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Fair value of fuel derivatives		$ (1,481,000,000)
Total collateral already posted aggregate fair value		835,000,000	$ 266,000,000
Aircraft collateral pledged to CP		(250,000,000)
Letters of credit (LC)		0
Counterparty A | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Fair value of fuel derivatives		(562,000,000)
Cash collateral held by CP		(284,000,000)
Aircraft collateral pledged to CP		(250,000,000)
Letters of credit (LC)		0
Counterparty B | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Fair value of fuel derivatives		(201,000,000)
Cash collateral held by CP		(159,000,000)
Aircraft collateral pledged to CP		0
Letters of credit (LC)		0
Counterparty C | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Fair value of fuel derivatives		(176,000,000)
Cash collateral held by CP		(56,000,000)
Aircraft collateral pledged to CP		0
Letters of credit (LC)		0
Counterparty D | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Fair value of fuel derivatives		(411,000,000)
Cash collateral held by CP		(299,000,000)
Aircraft collateral pledged to CP		0
Letters of credit (LC)		0
Counterparty E | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Fair value of fuel derivatives		(159,000,000)
Cash collateral held by CP		(37,000,000)
Aircraft collateral pledged to CP		0
Letters of credit (LC)		0
Counterparty F | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Fair value of fuel derivatives		20,000,000
Cash collateral held by CP		0
Aircraft collateral pledged to CP		0
Letters of credit (LC)		0
Counterparty Other | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Fair value of fuel derivatives	[1]	8,000,000
Cash collateral held by CP	[1]	0
Aircraft collateral pledged to CP	[1]	0
Letters of credit (LC)	[1]	0
Minimum | Counterparty A | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for aircraft	[2]	$ (200,000,000)
Option to substitute LC for cash Threshold 1
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		$ (50,000,000)
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2		(600,000,000)
Fair value of fuel derivative level at which cash is received from CP		50,000,000
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP	[3]	(200,000,000)
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		0
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2		$ (600,000,000)
Fair value of fuel derivative level at which cash is received from CP	[4]
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP		$ (200,000,000)
Minimum | Counterparty B | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for aircraft	[5]	(100,000,000)
Option to substitute LC for cash Threshold 1	[6]	(500,000,000)
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(50,000,000)
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2		(500,000,000)
Fair value of fuel derivative level at which cash is received from CP		150,000,000
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP	[5]	(100,000,000)
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		0
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2		$ (500,000,000)
Fair value of fuel derivative level at which cash is received from CP	[4]
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP		$ (100,000,000)
Minimum | Counterparty C | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for cash Threshold 1	[6]	(225,000,000)
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(125,000,000)
Fair value of fuel derivative level at which cash is received from CP	[7]	$ 175,000,000
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1	[4]
Fair value of fuel derivative level at which cash is received from CP	[4]
Minimum | Counterparty D | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for aircraft	[5]	$ (150,000,000)
Option to substitute LC for cash Threshold 1	[6]	(75,000,000)
Option to substitute LC for cash Threshold 2	[6]	(550,000,000)
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(75,000,000)
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2		(550,000,000)
Fair value of fuel derivative level at which cash is received from CP		250,000,000
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP	[5]	(150,000,000)
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		0
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2		$ (550,000,000)
Fair value of fuel derivative level at which cash is received from CP	[4]
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP		$ (150,000,000)
Minimum | Counterparty E | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for aircraft	[5]	(150,000,000)
Option to substitute LC for cash Threshold 1	[6]	(125,000,000)
Option to substitute LC for cash Threshold 2	[6]	(550,000,000)
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(125,000,000)
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2		(550,000,000)
Fair value of fuel derivative level at which cash is received from CP		75,000,000
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP	[5]	(150,000,000)
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		0
Fair value of fuel derivative levels at which cash is provided to CP Threshold 2		$ (550,000,000)
Fair value of fuel derivative level at which cash is received from CP	[4]
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP		$ (150,000,000)
Minimum | Counterparty F | Fuel derivatives
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(100,000,000)
Fair value of fuel derivative level at which cash is received from CP		$ 0
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1	[4]
Fair value of fuel derivative level at which cash is received from CP	[4]
Maximum | Counterparty A | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for aircraft	[2]	$ (600,000,000)
Option to substitute LC for cash Threshold 1
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		$ (200,000,000)
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP	[3]	(600,000,000)
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(200,000,000)
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP		(600,000,000)
Maximum | Counterparty B | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for aircraft	[5]	(500,000,000)
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(100,000,000)
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP		(500,000,000)
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(100,000,000)
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP		(500,000,000)
Maximum | Counterparty C | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for cash Threshold 1	[6]	(275,000,000)
Maximum | Counterparty D | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for aircraft	[5]	(550,000,000)
Option to substitute LC for cash Threshold 1	[6]	(150,000,000)
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(150,000,000)
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP	[5]	(550,000,000)
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(150,000,000)
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP		(550,000,000)
Maximum | Counterparty E | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for aircraft	[5]	(550,000,000)
Option to substitute LC for cash Threshold 1	[6]	(150,000,000)
If credit rating is investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which cash is provided to CP Threshold 1		(150,000,000)
Fair value of fuel derivative levels at which aircraft or cash collateral is pledged to CP	[5]	(550,000,000)
If credit rating is non-investment grade, fair value of fuel derivative level at which:
Fair value of fuel derivative levels at which aircraft collateral is pledged to CP		$ (550,000,000)
Maximum | Counterparty F | Fuel derivatives
Schedule Of Fair Values Of Fuel Derivatives Amounts Posted As Collateral And Collateral Posting Thresholds [Line Items]
Option to substitute LC for cash Threshold 1	[8]

[1] Individual counterparties with fair value of fuel derivatives <$10 million.

[2] The Company has the option of providing letters of credit in addition to aircraft collateral if the appraised value of the aircraft does not meet the collateral requirement.

[3] The Company has the option of providing cash or pledging aircraft as collateral.

[4] Cash collateral is provided at 100 percent of fair value of fuel derivative contracts.

[5] The Company has the option of providing cash, letters of credit, or pledging aircraft as collateral.

[6] The Company has the option of providing cash or letters of credit as collateral.

[7] Thresholds may vary based on changes in credit ratings within investment grade.

[8] The Company has the option to substitute letters of credit for 100 percent of cash collateral requirement.

XML

Fair Value Measurements Narrative (Details)	12 Months Ended
	Dec. 31, 2015 Agreements
Fair Value Disclosures [Abstract]
Debt agreements not publicly held	6

XML

Fair Value Measurements - Measured on Recurring Basis (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount		$ 0	$ 0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount		0	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount		0	0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net		0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net		0	0
Fuel derivatives:
Derivative Liability, Fair Value, Gross Liability	[1]	(3,465)	(2,409)
Fair Value, Measurements, Recurring | Period end date
Assets
Treasury bills		1,248	1,450
Interest rate derivatives (see Note 10)		2	13
Fuel derivatives:
Other available for sale securities		93	95
Total assets		5,081	4,443
Fuel derivatives:
Interest rate derivatives (see Note 10)		(49)	(61)
Total Liabilities		(3,465)	(2,409)
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Treasury bills		1,248	1,450
Interest rate derivatives (see Note 10)		0	0
Fuel derivatives:
Other available for sale securities		66	63
Total assets		2,651	2,623
Fuel derivatives:
Interest rate derivatives (see Note 10)		0	0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets
Treasury bills		0	0
Interest rate derivatives (see Note 10)		2	13
Fuel derivatives:
Other available for sale securities		0	0
Total assets		1,437	896
Fuel derivatives:
Interest rate derivatives (see Note 10)		(49)	(61)
Total Liabilities		(823)	(426)
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets
Treasury bills		0	0
Interest rate derivatives (see Note 10)		0	0
Fuel derivatives:
Other available for sale securities		27	32
Total assets		993	924
Fuel derivatives:
Interest rate derivatives (see Note 10)		0	0
Total Liabilities		(2,642)	(1,983)
Cash Equivalents | Fair Value, Measurements, Recurring | Period end date
Assets
Cash equivalents	[2]	1,337	1,110
Cash Equivalents | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Cash equivalents	[2]	1,337	1,110
Cash Equivalents | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets
Cash equivalents	[2]	0	0
Cash Equivalents | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets
Cash equivalents	[2]	0	0
Commercial paper | Fair Value, Measurements, Recurring | Period end date
Assets
Cash equivalents		200	70
Commercial paper | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Cash equivalents		0	0
Commercial paper | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets
Cash equivalents		200	70
Commercial paper | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets
Cash equivalents		0	0
Certificates of deposit | Fair Value, Measurements, Recurring | Period end date
Assets
Cash equivalents		13	4
Certificates of deposit | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Cash equivalents		0	0
Certificates of deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets
Cash equivalents		13	4
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets
Cash equivalents		0	0
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Period end date
Assets
Cash equivalents		33	98
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Cash equivalents		0	0
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets
Cash equivalents		33	98
Eurodollar Time Deposits | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets
Cash equivalents		0	0
Certificates of deposit | Fair Value, Measurements, Recurring | Period end date
Assets
Investments		220	256
Certificates of deposit | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets
Investments		0	0
Certificates of deposit | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets
Investments		220	256
Certificates of deposit | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets
Investments		0	0
Swap | Fair Value, Measurements, Recurring | Period end date
Fuel derivatives:
Derivative Liability, Fair Value, Gross Asset	[3]	931	455
Fuel derivatives:
Derivative Liability, Fair Value, Gross Liability	[3]	(774)	(365)
Swap | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Fuel derivatives:
Derivative Liability, Fair Value, Gross Asset	[3]	0	0
Fuel derivatives:
Derivative Liability, Fair Value, Gross Liability	[3]	0	0
Swap | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Fuel derivatives:
Derivative Liability, Fair Value, Gross Asset	[3]	931	455
Fuel derivatives:
Derivative Liability, Fair Value, Gross Liability	[3]	(774)	(365)
Swap | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Fuel derivatives:
Derivative Liability, Fair Value, Gross Asset	[3]	0	0
Fuel derivatives:
Derivative Liability, Fair Value, Gross Liability	[3]	0	0
Options Held | Fair Value, Measurements, Recurring | Period end date
Fuel derivatives:
Derivative Liability, Fair Value, Gross Asset	[3]	956	892
Fuel derivatives:
Derivative Asset, Fair Value, Gross Liability	[4]	(26)
Derivative Liability, Fair Value, Gross Liability	[3]	(2,616)	(1,983)
Options Held | Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Fuel derivatives:
Derivative Liability, Fair Value, Gross Asset	[3]	0	0
Fuel derivatives:
Derivative Asset, Fair Value, Gross Liability	[4]	0
Derivative Liability, Fair Value, Gross Liability	[3]	0	0
Options Held | Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Fuel derivatives:
Derivative Liability, Fair Value, Gross Asset	[3]	0	0
Fuel derivatives:
Derivative Asset, Fair Value, Gross Liability	[4]	0
Derivative Liability, Fair Value, Gross Liability	[3]	0	0
Options Held | Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Fuel derivatives:
Derivative Liability, Fair Value, Gross Asset	[3]	956	892
Fuel derivatives:
Derivative Asset, Fair Value, Gross Liability	[4]	(26)
Derivative Liability, Fair Value, Gross Liability	[3]	$ (2,616)	$ (1,983)

[1] Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.

[2] Cash equivalents are primarily composed of money market investments.

[3] In the Consolidated Balance Sheet amounts are presented as a net liability. See Note 10

[4] In the Consolidated Balance Sheet amounts are presented as a net asset. See Note 10.

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Fair Value Measurement - Fair Value Assets and Liabilities Measured on Recurring Basis with Unobservable Inputs (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	$ 1,937	$ 1,360
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		(1,059)	216
Total gains or (losses) (realized or unrealized)
Included in earnings		(647)	(439)
Included in other comprehensive income		(858)	(1,088)
Purchases		750	403
Sales		(200)	(170)
Settlements		365	19
Ending Balance		(1,649)	(1,059)
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2015		(428)	(450)
Fuel derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		(1,091)	172
Total gains or (losses) (realized or unrealized)
Included in earnings		(646)	(439)
Included in other comprehensive income		(858)	(1,091)
Purchases	[2]	750	403
Sales	[2]	(196)	(155)
Settlements		365	19
Ending Balance		(1,676)	(1,091)
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2015		(428)	(450)
Other securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		32	44
Total gains or (losses) (realized or unrealized)
Included in earnings		(1)	0
Included in other comprehensive income		0	3
Purchases		0	0
Sales		(4)	(15)
Settlements		0	0
Ending Balance		27	32
The amount of total losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at December 31, 2015		0	$ 0
Quoted prices in active markets for identical assets (Level 1) | Swap | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[3]	0
Quoted prices in active markets for identical assets (Level 1) | Options Held | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[3]	0
Significant other observable inputs (Level 2) | Swap | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[3]	38
Significant other observable inputs (Level 2) | Options Held | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[3]	0
Significant unobservable inputs (Level 3) | Swap | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[3]	0
Significant unobservable inputs (Level 3) | Options Held | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[3]	10
Estimate of Fair Value Measurement [Member] | Swap | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[3]	38
Estimate of Fair Value Measurement [Member] | Options Held | Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Derivative Asset, Fair Value, Gross Asset	[3]	$ 10

[1] Represents the position of each trade before consideration of offsetting positions with each counterparty and does not include the impact of cash collateral deposits provided to or received from counterparties. See discussion of credit risk and collateral following in this Note.

[2] The purchase and sale of fuel derivatives are recorded gross based on the structure of the derivative instrument and whether a contract with multiple derivatives is purchased as a single instrument or separate instruments.

[3] In the Consolidated Balance Sheet amounts are presented as a net asset. See Note 10.

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Fair Value Measurements - Quantitative Information about Level 3 Fair Value (Details) - Option Model - Implied Volatility - Fuel derivatives	Dec. 31, 2015
2016
Quantitative Information About Level 3 [Line Items]
Fair Value Measurement Range, Minimum	26.00%
Fair Value Measurement Range, Maximum	47.00%
2017
Quantitative Information About Level 3 [Line Items]
Fair Value Measurement Range, Minimum	25.00%
Fair Value Measurement Range, Maximum	37.00%
2018
Quantitative Information About Level 3 [Line Items]
Fair Value Measurement Range, Minimum	16.00%
Fair Value Measurement Range, Maximum	31.00%

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Fair Value Instruments - Carrying and Estimated Fair Value of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Nov. 06, 2014	Dec. 31, 2013	Oct. 31, 2009	Jul. 01, 2009	Apr. 29, 2009	May. 06, 2008	Dec. 31, 2006	Feb. 28, 2005	Feb. 28, 1997
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 3,198	$ 2,713
5.75% Notes due 2016
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)									5.75%
5.75% Notes due 2016 | Unsecured Debt
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 307	$ 313
Interest rate stated in the debt agreement (in hundredths)	5.75%
5.25% Convertible Senior Notes due 2016 | Convertible Debt
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)	5.25%	5.25%		5.25%
5.125% Notes due 2017
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)										5.125%
5.125% Notes due 2017 | Unsecured Debt
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 309	$ 316
Interest rate stated in the debt agreement (in hundredths)	5.125%
French Credit Agreements due 2018 - 1.53% | Notes Payable to Banks
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 25	36
Interest rate stated in the debt agreement (in hundredths)	1.53%
2.75% Unsecured Senior Notes Due 2019
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)			2.75%
2.75% Unsecured Senior Notes Due 2019 | Unsecured Debt
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 303	300
Interest rate stated in the debt agreement (in hundredths)	2.75%
Term Loan Agreement due 2019 - 6.315%
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)							6.315%
Term Loan Agreement due 2019 - 6.315% | Notes Payable to Banks
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 143	178
Interest rate stated in the debt agreement (in hundredths)	6.315%
Term Loan Agreement due 2019 - 4.84%
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)						4.84%
Term Loan Agreement due 2019 - 4.84% | Notes Payable to Banks
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 36	73
Interest rate stated in the debt agreement (in hundredths)	4.84%
2.65% Notes due 2020
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)	2.65%
2.65% Notes due 2020 | Unsecured Debt
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 494	0
Interest rate stated in the debt agreement (in hundredths)	2.65%
Term Loan Agreement due 2020 - 5.223%
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)								5.223%
Term Loan Agreement due 2020 - 5.223% | Notes Payable to Banks
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 329	372
Interest rate stated in the debt agreement (in hundredths)	5.223%
Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 340	355
Interest rate stated in the debt agreement (in hundredths)	6.24%
7.375% Debentures due 2027
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)											7.375%
7.375% Debentures due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 132	134
Interest rate stated in the debt agreement (in hundredths)	7.375%
Level 2 | 5.75% Notes due 2016 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	$ 319
Level 2 | 5.25% Convertible Senior Notes due 2016 | Convertible Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	324
Level 2 | 5.125% Notes due 2017 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	321
Level 2 | 2.75% Unsecured Senior Notes Due 2019 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	307
Level 2 | 2.65% Notes due 2020 | Unsecured Debt
Debt Instrument [Line Items]
Notes Payable, Fair Value	493
Level 2 | Pass Through Certificates due 2022 - 6.24% | Enhanced Equipment Trust Certificate
Debt Instrument [Line Items]
Notes Payable, Fair Value	382
Level 2 | 7.375% Debentures due 2027 | Unsecured Debt
Debt Instrument [Line Items]
Loans Payable, Fair Value	154
Level 3 | French Credit Agreements due 2018 - 1.53% | Notes Payable to Banks
Debt Instrument [Line Items]
Notes Payable, Fair Value	25
Level 3 | Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% | Notes Payable to Banks
Debt Instrument [Line Items]
Notes Payable, Fair Value	17
Level 3 | Term Loan Agreement due 2019 - 6.315% | Notes Payable to Banks
Debt Instrument [Line Items]
Loans Payable, Fair Value	147
Level 3 | Term Loan Agreement due 2019 - 4.84% | Notes Payable to Banks
Debt Instrument [Line Items]
Loans Payable, Fair Value	37
Level 3 | Term Loan Agreement due 2020 - 5.223% | Notes Payable to Banks
Debt Instrument [Line Items]
Loans Payable, Fair Value	323
Level 3 | Floating-rate 737 Aircraft Notes payable through 2020 | Notes Payable to Banks
Debt Instrument [Line Items]
Notes Payable, Fair Value	253
AirTran Airways | 5.25% Convertible Senior Notes due 2016
Debt Instrument [Line Items]
Interest rate stated in the debt agreement (in hundredths)					5.25%
AirTran Airways | 5.25% Convertible Senior Notes due 2016 | Convertible Debt
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 111	113
Interest rate stated in the debt agreement (in hundredths)	5.25%
AirTran Airways | Fixed-rate 737 Aircraft Notes payable through 2018 - 7.02% | Notes Payable to Banks
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 17	24
Interest rate stated in the debt agreement (in hundredths)	7.02%
AirTran Airways | Floating-rate 737 Aircraft Notes payable through 2020 | Notes Payable to Banks
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 257	$ 300

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at end of period	$ (1,051)	$ (738)
Fuel derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,666)	(1,177)	$ (20)
Changes in fair value	(867)	(1,191)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	378	34
Interest rate derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(30)	(45)	(58)
Changes in fair value	(5)	(10)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	20	23
Defined benefit plan items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	22	41	65
Changes in fair value	(19)	(24)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	6	8	8
Changes in fair value	(2)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Deferred tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	617	435	2
Changes in fair value	329	454
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(147)	(21)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,051)	(738)	$ (3)
Changes in fair value	(564)	(771)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 251	$ 36

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Accumulated Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Fuel and oil	$ (3,616)	$ (5,293)	$ (5,763)
Less: Tax Expense	1,298	680	455
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net of Tax	251
Fuel derivatives | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Fuel and oil	378
Less: Tax Expense	140
Net of Tax	238
Interest rate derivatives | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	20
Less: Tax Expense	7
Net of Tax	13
Interest rate derivatives
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(30)	(45)	(58)
Changes in fair value	(5)	(10)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	20	23
Fuel derivatives
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,666)	(1,177)	(20)
Changes in fair value	(867)	(1,191)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	378	34
Other
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	6	8	8
Changes in fair value	(2)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Defined benefit plan items
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	22	41	65
Changes in fair value	(19)	(24)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Deferred tax
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	617	435	2
Changes in fair value	329	454
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(147)	(21)
Accumulated other comprehensive income (loss)
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,051)	(738)	$ (3)
Changes in fair value	(564)	(771)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 251	$ 36

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Employee Retirement Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined contribution plans [Abstract]
Company contributions to all defined contribution plans expensed		$ 945	$ 644	$ 497
Maximum age after retirement that employees may use accrued unused sick time to pay for medical and dental premiums		65 years
Change in benefit obligation [Roll Forward]
APBO at beginning of period		$ 169	138
Service cost		11	10	30
Interest cost		7	7	4
Benefits paid		(6)	(4)
Actuarial gain		20	21
Settlements		0	(3)
APBO at end of period		201	169	138
Effect of a one percentage point change in assumed health care cost trend rates [Abstract]
Increase in total service and interest costs		3
Increase in the APBO		29
Decrease in total service and interest costs		(2)
Decrease in the APBO		(24)
Estimated future benefit payments time period [Abstract]
2016		5
2017		6
2018		7
2019		8
2020		9
Next five years thereafter		71
Reconciliation of funded status to accrued postretirement benefit cost recognized on the balance sheet [Abstract]
Funded status		(201)	(169)
Unrecognized net actuarial gain		(31)	(53)
Unrecognized prior service cost		9	12
Accumulated other comprehensive income		22	41
Cost recognized on Consolidated Balance Sheet		(201)	(169)
Components of periodic postretirement benefit cost [Abstract]
Service cost		11	10	30
Interest cost		7	7	4
Amortization of prior service cost		3	3	3
Recognized actuarial gain		(3)	(4)	(4)
Settlements		0	(1)	0
Net periodic postretirement benefit cost		$ 18	$ 15	$ 33
Actuarial assumptions used to account for postretirement benefit plans [Abstract]
Weighted-average discount rate (in hundredths)		4.50%	4.10%	5.05%
Assumed healthcare cost trend rates [Abstract]
Assumed healthcare cost trend rate decline (in hundredths)		5.19%
Assumed healthcare cost trend rate	[1]	7.08%	6.88%	7.50%
Year the health care cost trend reaches ultimate rate (year)		2026

[1] The assumed healthcare cost trend rate is assumed to remain at 7.08% for 2016, then decline gradually to 5.19% by 2026 and remain level thereafter.

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Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
DEFERRED TAX LIABILITIES:
Accelerated depreciation	$ 4,429	$ 4,277
Other	62	51
Deferred Tax Liabilities, Gross	4,491	4,328
Total deferred tax liabilities	2,490	2,782
DEFERRED TAX ASSETS:
Fuel derivative instruments	750	521
Capital and operating leases	81	125
Deferred tax assets construction obligation	289	209
Accrued engine maintenance	74	83
Accrued employee benefits	541	334
State taxes	62	65
Business partner income	107	90
Other	97	119
Total deferred tax assets	2,001	1,546
CURRENT:
Federal	1,292	203	$ 355
State	114	29	44
Total current	1,406	232	399
DEFERRED:
Federal	(97)	421	62
State	(11)	27	(6)
Total deferred	(108)	448	56
Total	1,298	680	455
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax at statutory U.S. tax rates	1,218	636	423
Nondeductible items	15	9	10
State income taxes, net of federal benefit	66	37	25
Other, net	$ (1)	$ (2)	$ (3)

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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Revenue	$ 124	$ 303											$ 427
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share	$ 0.10	$ 0.24											$ 0.34
Change in Accounting Estimate Financial Effect on Passenger Revenue		$ 30		$ 41		$ 43		$ 55					$ 115	$ 55
Change in accounting estimate,financial effect on earnings per share		$ 0.02		$ 0.03		$ 0.03		$ 0.04					$ 0.09	$ 0.04
Revenues	$ 4,977	$ 5,318	[1],[2]	$ 5,111	[1],[2]	$ 4,414	[1],[2]	$ 4,628	[1]	$ 4,800	$ 5,011	$ 4,166	$ 19,820	$ 18,605	$ 17,699
Operating income	1,026	1,225		1,085		780		621		614	775	215	4,116	2,225	1,278
Income before income taxes	847	933		977		723		302		525	746	244	3,479	1,816	1,209
Net income	$ 536	$ 584		$ 608		$ 453		$ 190		$ 329	$ 465	$ 152	$ 2,181	$ 1,136	$ 754
Basic (in dollars per share)	$ 0.83	$ 0.89	[1],[2]	$ 0.91	[1],[2]	$ 0.67	[1],[2]	$ 0.28	[1]	$ 0.48	$ 0.67	$ 0.22	$ 3.30	$ 1.65	$ 1.06
Diluted (in dollars per share)	$ 0.82	$ 0.88	[1]	$ 0.90	[1]	$ 0.66	[1]	$ 0.28	[1]	$ 0.48	$ 0.67	$ 0.22	$ 3.27	$ 1.64	$ 1.05

[1] Includes a change in estimate, recorded on a prospective basis, effective October 1, 2014, which increased Passenger revenues by approximately $43 million, $41 million, and $30 million, and increased both Basic and Diluted net income per share by approximately $.03, $.03, and $.02 for first, second, and third quarters of 2015, respectively. Also, as a result, fourth quarter 2014 Passenger revenues increased by approximately $55 million and both Basic and Diluted net income per share for the period increased by $.04. See Note 1 for further detail.

[2] Includes the impact of the July 2015 amended Agreement with Chase and the resulting change in accounting methodology. The impact of this change during third quarter and fourth quarter 2015 resulted in increases to Operating revenue of approximately $303 million and $124 million, and increased both Basic and Diluted net income per share by approximately $.24 and $.10, respectively. See Note 1 for further detail.

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Airtran Acquisition and Related Matters (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Acquisition and integration	$ 39	$ 126	$ 86