Condensed Consolidated Statement of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OPERATING REVENUES:
Passenger	$ 5,358	$ 5,379	$ 9,943	$ 9,925
Freight	44	44	87	86
Other	340	308	656	574
Total operating revenues	5,742	5,731	10,686	10,585
OPERATING EXPENSES:
Salaries, wages, and benefits	1,927	1,863	3,748	3,594
Fuel and oil	1,202	1,024	2,220	1,979
Maintenance materials and repairs	274	251	531	494
Landing fees and airport rentals	344	332	675	645
Depreciation and amortization	292	319	569	637
Other operating expenses	731	727	1,355	1,414
Total operating expenses	4,770	4,516	9,098	8,763
OPERATING INCOME	972	1,215	1,588	1,822
OTHER EXPENSES (INCOME):
Interest Expense	33	27	66	56
Capitalized interest	(10)	(13)	(20)	(23)
Interest income	(15)	(8)	(27)	(15)
Other (gains) losses, net	4	44	8	106
Total other expenses (income)	12	50	27	124
INCOME BEFORE INCOME TAXES	960	1,165	1,561	1,698
PROVISION FOR INCOME TAXES	227	422	366	616
NET INCOME	$ 733	$ 743	$ 1,195	$ 1,082
NET INCOME PER SHARE, BASIC	$ 1.27	$ 1.23	$ 2.05	$ 1.78
NET INCOME PER SHARE, DILUTED	$ 1.27	$ 1.23	$ 2.05	$ 1.77
COMPREHENSIVE INCOME	$ 953	$ 792	$ 1,499	$ 1,142
BASIC WEIGHTED AVERAGE SHARES OUTSTANDING
Basic	578	604	582	608
DILUTED WEIGHTED AVERAGE SHARES OUTSTANDING
Diluted	579	605	583	610
Cash dividends declared per common share	$ 0.160	$ 0.125	$ 0.285	$ 0.225