CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 1,818	$ 73
Marketable securities	1,408	1,255
Total cash and marketable securities	3,226	1,328
Receivables - net	232	212
Inventories and supplies - net	44	51
Prepaid expenses and other current assets	98	72
Total Current Assets	3,600	1,663
Property and Equipment
Aircraft and other flight equipment	6,398	5,690
Other property and equipment	1,021	955
Deposits for future flight equipment	489	771
Property and Equipment Total	7,908	7,416
Less accumulated depreciation and amortization	2,877	2,614
Total Property and Equipment - Net	5,031	4,802
Other Assets	68	65
Total Assets	8,699	6,530
Current Liabilities
Accounts payable	71	63
Accrued wages, vacation and payroll taxes	257	298
Air traffic liability	785	669
Other accrued liabilities	735	661
Current portion of long-term debt	275	114
Total Current Liabilities	2,123	1,805
Long-Term Debt, Net of Current Portion	1,861	569
Other Liabilities and Credits
Deferred income taxes	733	682
Deferred revenue	491	431
Obligation for pension and postretirement medical benefits	272	270
Other liabilities	355	362
Other Liabilities and Credits Totals	1,851	1,745
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: 200,000,000 shares, Issued: 2016 - 128,941,102 shares; 2015 - 128,442,099 shares, Outstanding: 2016 - 123,079,519 shares; 2015 - 125,175,325 shares	1	1
Capital in excess of par value	103	73
Treasury stock (common), at cost: 2016 - 5,861,583 shares; 2015 - 3,266,774 shares	(444)	(250)
Accumulated other comprehensive loss	(284)	(303)
Retained earnings	3,488	2,890
Total Shareholders' Equity	2,864	2,411
Total Liabilities and Shareholders' Equity	$ 8,699	$ 6,530