Condensed Consolidated Statement of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING REVENUES:
Passenger	$ 4,585	$ 4,546
Freight	42	42
Other	317	266
Total operating revenues	4,944	4,854
OPERATING EXPENSES:
Salaries, wages, and benefits	1,821	1,730
Fuel and oil	1,018	956
Maintenance materials and repairs	257	243
Landing fees and airport rentals	330	313
Depreciation and amortization	277	318
Other operating expenses	625	688
Total operating expenses	4,328	4,248
OPERATING INCOME	616	606
OTHER EXPENSES (INCOME):
Interest Expense	32	29
Capitalized interest	(10)	(11)
Interest income	(12)	(7)
Other (gains) losses, net	4	(63)
Total other expenses (income)	14	74
INCOME BEFORE INCOME TAXES	602	532
PROVISION FOR INCOME TAXES	139	193
NET INCOME	$ 463	$ 339
NET INCOME PER SHARE, BASIC	$ 0.79	$ 0.55
NET INCOME PER SHARE, DILUTED	$ 0.79	$ 0.55
COMPREHENSIVE INCOME	$ 547	$ 350
BASIC WEIGHTED AVERAGE SHARES OUTSTANDING
Basic	587	613
DILUTED WEIGHTED AVERAGE SHARES OUTSTANDING
Diluted	588	614
Cash dividends declared per common share	$ 0.125	$ 0.100