Condensed Consolidated Balance Sheet - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,104	$ 1,495
Short-term investments	1,716	1,778
Accounts and other receivables	784	662
Inventories of parts and supplies, at cost	483	420
Prepaid expenses and other current assets	514	460
Total current assets	5,601	4,815
Property and equipment, at cost:
Flight equipment	21,409	21,368
Ground property and equipment	4,769	4,399
Deposits on flight equipment purchase contracts	820	919
Assets constructed for others	1,718	1,543
Property and equipment, at cost	28,716	28,229
Less allowance for depreciation and amortization	9,437	9,690
Property and equipment, net	19,279	18,539
Goodwill	970	970
Other assets	1,032	786
Total assets	26,882	25,110
Current liabilities:
Accounts payable	1,224	1,320
Accrued liabilities	1,517	1,700
Air traffic liability	4,756	3,495
Current maturities of long-term debt	346	348
Total current liabilities	7,843	6,863
Long-term debt less current maturities	3,100	3,320
Air traffic liability - noncurrent	827	1,070
Deferred income taxes	2,553	2,119
Construction obligation	1,658	1,390
Other noncurrent liabilities	748	707
Stockholders' equity:
Common stock	808	808
Capital in excess of par value	1,485	1,451
Retained earnings	15,402	13,832
Accumulated other comprehensive income	412	12
Treasury stock, at cost	(7,954)	(6,462)
Total stockholders' equity	10,153	9,641
Total liabilities and stockholders' equity	$ 26,882	$ 25,110