CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues
Total Operating Revenues	$ 1,876	$ 1,832
Operating Expenses
Wages and benefits	557	536
Variable incentive pay	35	39
Aircraft fuel, including hedging gains and losses	420	409
Aircraft maintenance	120	107
Aircraft rent	83	74
Landing fees and other rentals	132	126
Contracted services	72	81
Selling expenses	72	78
Depreciation and amortization	106	94
Food and beverage service	49	50
Third-party regional carrier expense	41	37
Other	138	141
Special items - merger-related costs	26	6
Special items—other	0	25
Total Operating Expenses	1,851	1,803
Operating Income	25	29
Nonoperating Income (Expense)
Interest income	9	8
Interest expense	(22)	(24)
Interest capitalized	4	5
Other—net	(10)	(12)
Nonoperating Income (Expense) Total	(19)	(23)
Income Before Income Tax	6	6
Income tax expense	2	2
Net Income	$ 4	$ 4
Basic Earnings Per Share (usd per share)	$ 0.03	$ 0.03
Diluted Earnings Per Share (usd per share)	$ 0.03	$ 0.03
Shares used for computation:
Basic shares (shares)	123,291	123,155
Diluted shares (shares)	123,915	123,630
Passenger Revenue [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,716	$ 1,684
Passenger Revenue [Member] | Passenger [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	1,716	1,684
Mileage Plan Revenue [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	263	246
Mileage Plan Revenue [Member] | Passenger [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	153	139
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	110	107
Cargo and Other Revenue [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	50	41
Cargo and Other Revenue [Member] | Cargo and Freight [Member]
Operating Revenues
Revenue from Contract with Customer, Excluding Assessed Tax	$ 50	$ 41