CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net Income	$ 184	$ 149
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	88	76
Stock-based compensation and other	9	9
Changes in certain assets and liabilities:
Changes in deferred tax provision	(8)	(6)
Increase (decrease) in air traffic liability	199	183
Increase (decrease) in deferred revenue	36	8
Other - net	17	95
Net cash provided by operating activities	525	514
Property and equipment additions:
Aircraft and aircraft purchase deposits	(91)	(245)
Other flight equipment	(15)	(21)
Other property and equipment	(13)	(13)
Total property and equipment additions, including capitalized interest	(119)	(279)
Purchases of marketable securities	(358)	(403)
Sales and maturities of marketable securities	140	259
Proceeds from disposition of assets and changes in restricted deposits	1	2
Net cash used in investing activities	(336)	(421)
Cash flows from financing activities:
Long-term debt payments	(36)	(35)
Common stock repurchases	(127)	(102)
Dividends paid	(34)	(26)
Other financing activities	13	14
Net cash used in financing activities	(184)	(149)
Net increase (decrease) in cash and cash equivalents	5	(56)
Cash and cash equivalents at beginning of year	73	107
Cash and cash equivalents at end of the period	78	51
Cash paid during the period for:
Interest (net of amount capitalized)	8	7
Income taxes paid (received)	$ 13	$ (65)