CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net Income	$ 700	$ 657
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	281	236
Stock-based compensation and other	19	22
Changes in certain assets and liabilities:
Changes in deferred tax provision	47	(17)
Increase (decrease) in air traffic liability	116	129
Increase (decrease) in deferred revenue	60	42
Other - net	(17)	160
Net cash provided by operating activities	1,206	1,229
Property and equipment additions:
Aircraft and aircraft purchase deposits	(408)	(563)
Other flight equipment	(35)	(61)
Other property and equipment	(66)	(44)
Total property and equipment additions, including capitalized interest	(509)	(668)
Purchases of marketable securities	(775)	(876)
Sales and maturities of marketable securities	638	818
Proceeds from disposition of assets and changes in restricted deposits	5	(1)
Net cash used in investing activities	(641)	(727)
Cash flows from financing activities:
Proceeds from issuance of debt	1,546	0
Long-term debt payments	(93)	(93)
Common stock repurchases	(193)	(381)
Dividends paid	(102)	(78)
Other financing activities	22	31
Net cash used in financing activities	1,180	(521)
Net increase (decrease) in cash and cash equivalents	1,745	(19)
Cash and cash equivalents at beginning of year	73	107
Cash and cash equivalents at end of the period	1,818	88
Cash paid during the period for:
Interest (net of amount capitalized)	12	9
Income taxes paid (received)	$ 321	$ 262