CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net Income	$ 383	$ 259
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	155	143
Stock-based compensation and other	14	21
Changes in certain assets and liabilities:
Changes in deferred income taxes	(44)	14
Increase in air traffic liability	209	243
Increase (decrease) in deferred revenue	27	7
Other - net	145	(52)
Net cash provided by operating activities	889	635
Property and equipment additions:
Aircraft and aircraft purchase deposits	(490)	(255)
Other flight equipment	(43)	(60)
Other property and equipment	(26)	(35)
Total property and equipment additions	(559)	(350)
Purchases of marketable securities	(711)	(628)
Sales and maturities of marketable securities	676	398
Proceeds from disposition of assets and changes in restricted deposits	0	(2)
Net cash used in investing activities	(594)	(582)
Cash flows from financing activities:
Proceeds from issuance of debt	0	51
Long-term debt payments	(58)	(64)
Common stock repurchases	(262)	(83)
Dividends paid	(52)	(34)
Other financing activities	15	19
Net cash used in financing activities	(357)	(111)
Net increase (decrease) in cash and cash equivalents	(62)	(58)
Cash and cash equivalents at beginning of year	107	80
Cash and cash equivalents at end of the period	45	22
Cash paid during the period for:
Interest (net of amount capitalized)	8	16
Income taxes paid (received)	$ 108	$ 93