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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
NET CASH PROVIDED BY OPERATING ACTIVITIES$ 161,399$ 268,349
CASH FLOWS FROM INVESTING ACTIVITIES:  
Purchases of marketable securities(469,956)(636,887)
Sales of marketable securities522,138488,051
Payments received on note receivable from United Air Lines 79,333
Proceeds from the sale of equipment191138
Acquisition of property and equipment:  
Aircraft and rotable spare parts(91,522)(125,424)
Deposits on aircraft(13,500) 
Buildings and ground equipment(10,596)(7,216)
Increase in other assets(2,596)(27,981)
NET CASH (USED IN) INVESTING ACTIVITIES(65,841)(229,986)
CASH FLOWS FROM FINANCING ACTIVITIES:  
Proceeds from issuance of long-term debt38,22781,698
Principal payments on long-term debt(110,536)(103,556)
Return of deposits on aircraft and rotable spare parts7,1504,247
Net proceeds from issuance of common stock4,4444,888
Purchase of treasury stock(56,166)(12,518)
Payment of cash dividends(6,417)(6,762)
NET CASH (USED IN) FINANCING ACTIVITIES(123,298)(32,003)
Increase (decrease) in cash and cash equivalents(27,740)6,360
Cash and cash equivalents at beginning of period112,33876,414
CASH AND CASH EQUIVALENTS AT END OF PERIOD84,59882,774
Cash paid during the year for:  
Interest, net of capitalized amounts56,93659,295
Income taxes$ 332$ 382