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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net Cash Provided by Operating Activities
Net Cash Provided by Operating Activities	$ 1,951	$ 1,372
Property and equipment additions:
Flight equipment, including advance payments	(1,059)	(991)
Ground property and equipment, including technology	(301)	(274)
Purchase of short-term investments	0	(63)
Redemption of short-term investments	206	363
Other, net	49	38
Net cash used in investing activities	(1,105)	(927)
Cash Flows from Financing Activities:
Payments on long-term debt and finance lease obligations	(1,285)	(244)
Repurchase of common stock	(1,325)	(325)
Cash dividends	(233)	(217)
Proceeds from short-term obligations	1,750	0
Proceeds from long-term obligations	500	0
Other, net	(16)	(30)
Net cash used in financing activities	(609)	(816)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	237	(371)
Cash, cash equivalents and restricted cash at beginning of period	2,748	1,853
Cash, cash equivalents and restricted cash at end of period	2,985	1,482
Non-Cash Transactions:
Flight and ground equipment acquired under operating leases	274	361
Flight and ground equipment acquired under finance leases	$ 3	$ 26

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