CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues
Passenger, Mainline	$ 1,562	$ 1,073	$ 4,390	$ 3,036
Passenger, Regional	262	249	725	682
Total passenger revenue	1,824	1,322	5,115	3,718
Freight and mail	32	31	88	82
Other—net	264	213	768	607
Total Operating Revenues	2,120	1,566	5,971	4,407
Operating Expenses
Wages and benefits	475	340	1,392	1,008
Variable incentive pay	40	31	98	95
Aircraft fuel, including hedging gains and losses	368	225	1,051	593
Aircraft maintenance	88	64	271	197
Aircraft rent	70	25	204	80
Landing fees and other rentals	124	89	338	232
Contracted services	76	63	234	183
Selling expenses	91	58	269	162
Depreciation and amortization	95	101	275	281
Food and beverage service	50	31	145	93
Third-party regional carrier expense	30	25	84	72
Special items—merger-related costs	24	22	88	36
Other	150	92	424	267
Total Operating Expenses	1,681	1,166	4,873	3,299
Operating Income	439	400	1,098	1,108
Nonoperating Income (Expense)
Interest income	9	7	25	20
Interest expense	(26)	(11)	(77)	(33)
Interest capitalized	5	6	13	21
Other—net	0	0	(1)	(2)
Nonoperating Income (Expense) Total	(12)	2	(40)	6
Income before income tax	427	402	1,058	1,114
Income tax expense	161	146	397	414
Net Income	$ 266	$ 256	$ 661	$ 700
Basic Earnings Per Share (usd per share)	$ 2.15	$ 2.08	$ 5.35	$ 5.66
Diluted Earnings Per Share (usd per share)	$ 2.14	$ 2.07	$ 5.31	$ 5.63
Shares used for computation:
Basic shares (shares)	123,467	123,149	123,501	123,648
Diluted shares (shares)	124,220	123,833	124,341	124,393
Cash dividend declared per share (usd per share)	$ 0.3	$ 0.275	$ 0.9	$ 0.825