Condensed Consolidated Statement of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING REVENUES:
Passenger	$ 3,838	$ 3,751
Freight	39	37
Other	207	203
Total operating revenues	4,084	3,991
OPERATING EXPENSES:
Salaries, wages, and benefits	1,183	1,141
Fuel and oil	1,457	1,510
Maintenance materials and repairs	291	272
Aircraft rentals	93	88
Landing fees and other rentals	266	254
Depreciation and amortization	210	201
Acquisition and integration	13	13
Other operating expenses	501	490
Total operating expenses	4,014	3,969
OPERATING INCOME	70	22
OTHER EXPENSES (INCOME):
Interest expense	29	40
Capitalized interest	(5)	(5)
Interest income	(2)	(2)
Other gains, net	(46)	(170)
Total other income	(24)	(137)
INCOME BEFORE INCOME TAXES	94	159
PROVISION FOR INCOME TAXES	35	61
NET INCOME	59	98
NET INCOME PER SHARE, BASIC (in dollars per share)	$ 0.08	$ 0.13
NET INCOME PER SHARE, DILUTED (in dollars per share)	$ 0.08	$ 0.13
COMPREHENSIVE INCOME	$ 67	$ 265
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	725	771
Diluted (in shares)	727	772
Cash dividends declared per common share (in dollars per share)	$ 0.0100	$ 0.0045