Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 303,497	$ 285,037
Restricted cash	5,226	5,224
Total cash, cash equivalents and restricted cash	308,723	290,261
Accounts receivable, net of allowance for doubtful accounts of $956 as of June 30, 2011 and $744 as of December 31, 2010	79,279	59,887
Spare parts and supplies, net	22,639	18,354
Deferred tax assets, net	18,449	40,651
Prepaid expenses and other	59,094	37,367
Total	488,184	446,520
Property and equipment, less accumulated depreciation and amortization of $157,433 as of June 30, 2011 and $147,588 as of December 31, 2010	618,276	418,120
Other Assets:
Long-term prepayments and other	41,888	38,629
Deferred tax assets, net	69,254	38,847
Intangible assets, net of accumulated amortization of $142,659 as of June 30, 2011 and $130,951 as of December 31, 2010	57,012	68,720
Goodwill	106,663	106,663
Total Assets	1,381,277	1,117,499
Current Liabilities:
Accounts payable	86,802	69,300
Air traffic liability	339,008	250,861
Other accrued liabilities	55,605	63,506
Current maturities of long-term debt and capital lease obligations	31,933	16,888
Total	513,348	400,555
Long-Term Debt, less discount, and Capital Lease Obligations	377,106	171,884
Other Liabilities and Deferred Credits:
Accumulated pension and other postretirement benefit obligations	215,927	213,704
Other liabilities and deferred credits	33,029	53,487
Total	248,956	267,191
Commitments and Contingent Liabilities
Shareholders' Equity:
Special preferred stock, $0.01 par value per share, three shares issued and outstanding at June 30, 2011 and December 31, 2010
Common stock, $0.01 par value per share, 52,783,121 shares issued and 50,712,907 shares outstanding as of June 30, 2011; 52,291,091 shares issued and 50,220,877 outstanding as of December 31, 2010	528	522
Capital in excess of par value	258,947	245,947
Treasury stock, 2,070,214 shares at cost, at June 30, 2011 and December 31, 2010	(10,752)	(10,752)
Accumulated income	28,244	77,431
Accumulated other comprehensive loss, net	(35,100)	(35,279)
Total	241,867	277,869
Total Liabilities and Shareholders' Equity	$ 1,381,277	$ 1,117,499