CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net Income (Loss)	$ (1,324)	$ 769	$ 437
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	420	423	398
Stock-based compensation and other	24	29	47
Special Items - Impairment charges and other	627	0	0
Restructuring Charges	220	0	0
Changes in certain assets and liabilities:
Changes in deferred tax provision	(300)	209	146
(Increase) decrease in accounts receivable	(160)	43	(25)
Increase (decrease) in air traffic liability	173	112	(18)
Increase in deferred revenue	288	116	149
Other - net	(202)	86	61
Net cash provided by (used in) operating activities	(234)	1,722	1,195
Property and equipment additions:
Aircraft and aircraft purchase deposits	(64)	(356)	(686)
Other flight equipment	(55)	(178)	(105)
Other property and equipment	(87)	(162)	(169)
Total property and equipment additions	(206)	(696)	(960)
Purchases of marketable securities	(2,962)	(1,810)	(834)
Sales and maturities of marketable securities	2,318	1,674	1,116
Proceeds from Sale of Productive Assets	279	28	16
Other investing activities	(22)	13	31
Net cash used in investing activities	(593)	(791)	(631)
Cash flows from financing activities:
Proceeds from issuance of long-term debt, net of issuance costs	2,564	450	339
Long-term debt payments	(565)	(1,058)	(807)
Common stock repurchases	(31)	(75)	(50)
Cash dividend paid	(45)	(173)	(158)
Other financing activities	58	43	29
Net cash provided by (used in) financing activities	1,981	(813)	(647)
Net increase (decrease) in cash, cash equivalents, and restricted cash	1,154	118	(83)
Cash, cash equivalents, and restricted cash at beginning of year	232	114	197
Cash, cash equivalents, and restricted cash at end of year	1,386	232	114
Cash paid during the year for:
Interest, net of amount capitalized	50	60	72
Income taxes, net of refunds received	$ 0	$ 31	$ 0