Condensed Consolidated Balance Sheet - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,114	$ 1,495
Short-term investments	1,572	1,778
Accounts and other receivables	765	662
Inventories of parts and supplies, at cost	459	420
Prepaid expenses and other current assets	498	460
Total current assets	5,408	4,815
Property and equipment, at cost:
Flight equipment	21,084	21,368
Ground property and equipment	4,626	4,399
Deposits on flight equipment purchase contracts	858	919
Assets constructed for others	1,664	1,543
Property and equipment, at cost	28,232	28,229
Less allowance for depreciation and amortization	9,166	9,690
Property and equipment, net	19,066	18,539
Goodwill	970	970
Other assets	1,021	786
Total assets	26,465	25,110
Current liabilities:
Accounts payable	1,338	1,320
Accrued liabilities	1,361	1,700
Air traffic liability	4,652	3,495
Current maturities of long-term debt	365	348
Total current liabilities	7,716	6,863
Long-term debt less current maturities	3,155	3,320
Air traffic liability - noncurrent	878	1,070
Deferred income taxes	2,414	2,119
Construction obligation	1,613	1,390
Other noncurrent liabilities	692	707
Stockholders' equity:
Common stock	808	808
Capital in excess of par value	1,469	1,451
Retained earnings	14,878	13,832
Accumulated other comprehensive income	298	12
Treasury stock, at cost	(7,456)	(6,462)
Total stockholders' equity	9,997	9,641
Total liabilities and stockholders' equity	$ 26,465	$ 25,110