CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net Income	$ 657	$ 457
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	236	218
Stock-based compensation and other	22	27
Changes in certain assets and liabilities:
Changes in deferred income taxes	(17)	27
Increase in air traffic liability	129	139
Increase (decrease) in deferred revenue	42	21
Other - net	160	3
Net cash provided by operating activities	1,229	892
Property and equipment additions:
Aircraft and aircraft purchase deposits	(563)	(414)
Other flight equipment	(61)	(92)
Other property and equipment	(44)	(53)
Total property and equipment additions	(668)	(559)
Purchases of marketable securities	(876)	(794)
Sales and maturities of marketable securities	818	739
Proceeds from disposition of assets and changes in restricted deposits	(1)	(4)
Net cash used in investing activities	(727)	(618)
Cash flows from financing activities:
Proceeds from issuance of debt	0	51
Long-term debt payments	(93)	(97)
Common stock repurchases	(381)	(242)
Dividends paid	(78)	(51)
Other financing activities	31	19
Net cash used in financing activities	(521)	(320)
Net increase (decrease) in cash and cash equivalents	(19)	(46)
Cash and cash equivalents at beginning of year	107	80
Cash and cash equivalents at end of the period	88	34
Cash paid during the period for:
Interest (net of amount capitalized)	9	26
Income taxes paid (received)	$ 262	$ 185