CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Revenues
Passenger revenue	$ 1,685	$ 1,602
Mileage plan other revenue	107	100
Cargo and other	40	38
Total Operating Revenues	1,832	1,740
Operating Expenses
Wages and benefits	536	450
Variable incentive pay	39	31
Aircraft fuel, including hedging gains and losses	409	339
Aircraft maintenance	107	87
Aircraft rent	74	65
Landing fees and other rentals	126	115
Contracted services	81	81
Selling expenses	78	83
Depreciation and amortization	94	90
Food and beverage service	50	45
Third-party regional carrier expense	37	27
Other	141	131
Special items—merger-related costs	6	39
Special items—other	25	0
Total Operating Expenses	1,803	1,583
Operating Income	29	157
Nonoperating Income (Expense)
Interest income	8	7
Interest expense	(24)	(25)
Interest capitalized	5	4
Other—net	(12)	(1)
Nonoperating Income (Expense) Total	(23)	(15)
Income Before Income Tax	6	142
Income tax expense	2	49
Net Income	$ 4	$ 93
Basic Earnings Per Share (usd per share)	$ 0.03	$ 0.75
Diluted Earnings Per Share (usd per share)	$ 0.03	$ 0.75
Shares used for computation:
Basic shares (shares)	123,155	123,495
Diluted shares (shares)	123,630	124,299
Cash dividend declared per share (usd per share)	$ 0.32	$ 0.3