Condensed Consolidated Balance Sheet - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 12,980	$ 11,063
Short-term investments	3,024	2,271
Accounts and other receivables	1,479	1,130
Inventories of parts and supplies, at cost	511	414
Prepaid expenses and other current assets	560	295
Total current assets	18,554	15,173
Property and equipment, at cost:
Flight equipment	21,262	20,877
Ground property and equipment	6,287	6,083
Deposits on flight equipment purchase contracts	0	305
Assets constructed for others	3	309
Property and equipment, at cost	27,552	27,574
Less allowance for depreciation and amortization	12,496	11,743
Property and equipment, net	15,056	15,831
Goodwill	970	970
Operating lease right-of-use assets	1,611	1,892
Other assets	919	722
Total assets	37,110	34,588
Current liabilities:
Accounts payable	1,229	931
Accrued liabilities	1,687	2,259
Current operating lease liabilities	243	306
Air traffic liability	5,751	3,790
Current maturities of long-term debt	225	220
Total current liabilities	9,135	7,506
Long-term debt less current maturities	11,013	10,111
Air traffic liability - noncurrent	2,485	3,343
Deferred income taxes	1,795	1,634
Construction obligation	0	309
Noncurrent operating lease liabilities	1,334	1,562
Other noncurrent liabilities	1,098	1,247
Stockholders' equity:
Common stock	888	888
Capital in excess of par value	4,251	4,191
Retained earnings	15,706	14,777
Accumulated other comprehensive income (loss)	267	(105)
Treasury stock, at cost	(10,862)	(10,875)
Total stockholders' equity	10,250	8,876
Total liabilities and stockholders' equity	$ 37,110	$ 34,588