CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net Income	$ 444	$ 383
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	180	155
Stock-based compensation and other	13	14
Changes in certain assets and liabilities:
Changes in deferred tax provision	41	(44)
Increase (decrease) in air traffic liability	201	209
Increase (decrease) in deferred revenue	48	27
Other - net	(28)	145
Net cash provided by operating activities	899	889
Property and equipment additions:
Aircraft and aircraft purchase deposits	(268)	(490)
Other flight equipment	(31)	(43)
Other property and equipment	(41)	(26)
Total property and equipment additions, including capitalized interest	(340)	(559)
Purchases of marketable securities	(610)	(711)
Sales and maturities of marketable securities	357	676
Proceeds from disposition of assets and changes in restricted deposits	3	0
Net cash used in investing activities	(590)	(594)
Cash flows from financing activities:
Long-term debt payments	(57)	(58)
Common stock repurchases	(193)	(262)
Dividends paid	(68)	(52)
Other financing activities	17	15
Net cash used in financing activities	(301)	(357)
Net increase (decrease) in cash and cash equivalents	8	(62)
Cash and cash equivalents at beginning of year	73	107
Cash and cash equivalents at end of the period	81	45
Cash paid during the period for:
Interest (net of amount capitalized)	8	8
Income taxes paid (received)	$ 182	$ 108