CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net Income	$ 94	$ 37
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70	69
Stock-based compensation and other	4	14
Changes in certain assets and liabilities:
Changes in deferred income taxes	9	18
Increase in air traffic liability	185	157
Increase (decrease) in deferred revenue	(1)	(2)
Other - net	(119)	(81)
Net cash provided by operating activities	242	212
Property and equipment additions:
Aircraft and aircraft purchase deposits	(65)	(90)
Other flight equipment	(17)	(6)
Other property and equipment	(11)	(7)
Total property and equipment additions	(93)	(103)
Purchases of marketable securities	(305)	(280)
Sales and maturities of marketable securities	227	239
Proceeds from disposition of assets and changes in restricted deposits	7	(7)
Net cash used in investing activities	(164)	(151)
Cash flows from financing activities:
Long-term debt payments	(37)	(88)
Common stock repurchases	(30)	(19)
Payments of Dividends	(17)	0
Other financing activities	16	19
Net cash used in financing activities	(68)	(88)
Net decrease in cash and cash equivalents	10	(27)
Cash and cash equivalents at beginning of year	80	122
Cash and cash equivalents at end of the period	90	95
Cash paid during the period for:
Interest (net of amount capitalized)	11	15
Income taxes	$ 6	$ 6