CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
CURRENT ASSETS:
Cash and cash equivalents	$ 139,131	$ 112,338
Marketable securities	523,672	670,739
Restricted cash	21,756	21,775
Income tax receivable	7,678	3,356
Receivables, net	143,864	110,207
Inventories, net	112,664	106,572
Prepaid aircraft rents	288,728	256,168
Deferred tax assets	60,225	56,102
Other current assets	27,283	32,308
Total current assets	1,325,001	1,369,565
PROPERTY AND EQUIPMENT:
Aircraft and rotable spares	3,859,587	3,836,550
Deposits on aircraft	13,500	400
Buildings and ground equipment	282,695	278,665
Total property and equipment, gross	4,155,782	4,115,615
Less accumulated depreciation and amortization	(1,278,124)	(1,172,796)
Total property and equipment, net	2,877,658	2,942,819
OTHER ASSETS
Intangible assets, net	20,622	21,747
Other assets	116,460	112,379
Total other assets	137,082	134,126
Total assets	4,339,741	4,446,510
CURRENT LIABILITIES:
Current maturities of long-term debt	160,490	159,039
Accounts payable	233,037	206,490
Accrued salaries, wages and benefits	110,650	112,728
Accrued aircraft rents	24,252	16,780
Taxes other than income taxes	22,161	25,146
Other current liabilities	35,355	42,457
Total current liabilities	585,945	562,640
OTHER LONG-TERM LIABILITIES	51,773	46,325
LONG-TERM DEBT, net of current maturities	1,658,122	1,738,936
DEFERRED INCOME TAXES PAYABLE	568,332	569,847
DEFERRED AIRCRAFT CREDITS	103,306	107,839
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Preferred stock, 5,000,000 shares authorized; none issued
Common stock, no par value, 120,000,000 shares authorized; 75,669,814 and 75,244,553 shares issued, respectively	593,902	589,610
Retained earnings	1,126,114	1,139,739
Treasury stock, at cost, 23,627,860 and 21,071,582 shares, respectively	(349,887)	(309,628)
Accumulated other comprehensive income	2,134	1,202
Total stockholders' equity	1,372,263	1,420,923
Total liabilities and stockholders' equity	$ 4,339,741	$ 4,446,510