CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net Income	$ 37	$ 41
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	69	64
Stock-based compensation and other	14	5
Changes in certain assets and liabilities:
Changes in fair values of open fuel hedge contracts	24	(25)
Changes in deferred income taxes	18	26
Increase in air traffic liability	157	165
Increase (decrease) in deferred revenue	(2)	(4)
Increase in other long-term liabilities	1	18
Other - net	(106)	(107)
Net cash provided by operating activities	212	183
Property and equipment additions:
Aircraft and aircraft purchase deposits	(90)	(81)
Other flight equipment	(6)	(2)
Other property and equipment	(7)	(15)
Total property and equipment additions	(103)	(98)
Assets constructed for others (Terminal 6 at LAX)	0	(24)
Purchases of marketable securities	(280)	(240)
Sales and maturities of marketable securities	239	188
Proceeds from disposition of assets and changes in restricted deposits	(7)	1
Net cash used in investing activities	(151)	(173)
Cash flows from financing activities:
Long-term debt payments	(88)	(59)
Common stock repurchases	(19)	(9)
Proceeds and tax benefit from issuance of common stock	11	4
Other financing activities	8	0
Net cash used in financing activities	(88)	(64)
Net decrease in cash and cash equivalents	(27)	(54)
Cash and cash equivalents at beginning of year	122	102
Cash and cash equivalents at end of the period	95	48
Cash paid during the period for:
Interest (net of amount capitalized)	15	16
Income taxes	6	(3)
Non-cash transactions:
Assets constructed related to Terminal 6 at LAX	$ 0	$ 51