CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Current Assets
Cash and cash equivalents	$ 1,015	$ 281
Restricted Cash	27	0
Marketable securities	1,490	1,510
Total cash and marketable securities	2,532	1,791
Receivables - net	510	383
Inventories and supplies - net	202	116
Prepaid expenses	270	176
Other Assets, Current	223	239
Total Current Assets	3,737	2,705
Property and Equipment
Aircraft and other flight equipment	12,349	10,425
Other property and equipment	2,109	1,814
Deposits for future flight equipment	612	491
Property and Equipment Total	15,070	12,730
Less accumulated depreciation and amortization	(4,548)	(4,342)
Total Property and Equipment - Net	10,522	8,388
Operating Lease, Right-of-Use Asset	1,346	1,195
Goodwill	2,703	1,943
Intangible assets - net	888	90
Other noncurrent assets	363	292
Other Assets	5,300	3,520
Total Assets	19,559	14,613
Liabilities, Noncurrent	8,832	3,859
Current Liabilities
Accounts payable	242	207
Accrued wages, vacation and payroll taxes	822	584
Other accrued liabilities	958	800
Operating Lease, Liability, Current	211	158
Current portion of long-term debt	523	353
Total Current Liabilities	6,248	4,459
Long-Term Debt, Net of Current Portion	4,159	2,182
Noncurrent Liabilities
Operating Lease, Liability, Noncurrent	1,249	1,125
Deferred Income Tax Liabilities, Net	889	695
Deferred revenue, noncurrent	1,578	1,382
Obligation for pension and postretirement medical benefits	505	362
Other liabilities	452	295
Commitments and Contingencies
Shareholders' Equity
Preferred stock, $0.01 par value, Authorized: 5,000,000 shares, none issued or outstanding	0	0
Common stock, $0.01 par value, Authorized: 400,000,000 shares, Issued: 2021 - 133,792,045 shares; 2020 - 133,567,534 shares, Outstanding: 2021 - 124,442,101 shares; 2020 - 124,217,590 shares	1	1
Capital in excess of par value	$ 769	$ 695
Treasury Stock, Common, Shares	14,462,445	12,870,477
Treasury stock (common), at cost: 2020 - 9,349,944 shares; 2020 - 9,349,944 shares	$ (882)	$ (819)
Accumulated other comprehensive loss	(268)	(299)
Retained earnings	4,859	4,535
Total Shareholders' Equity	4,479	4,113
Total Liabilities and Shareholders' Equity	19,559	14,613
Mileage Plan Revenue [Member]
Current Liabilities
Contract with Customer, Liability, Current	1,614	1,221
Contract with Customer, Liability, Current	1,614	1,221
Passenger Revenue [Member]
Current Liabilities
Contract with Customer, Liability, Current	1,878	1,136
Contract with Customer, Liability, Current	$ 1,878	$ 1,136