Condensed Consolidated Statements of Cash Flows (unaudited, in thousands) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
OPERATING ACTIVITIES:
Net income	$ 29,102	$ 40,162
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,046	17,042
Loss on aircraft and other equipment disposals	3,816	1,468
Provision for obsolescence of expendable parts, supplies and fuel	90	90
Amortization of deferred financing costs and original issue discount	150
Stock compensation expense	2,387	2,140
Deferred income taxes	5,943	(2,271)
Excess tax benefits from stock option exercises	(173)	(667)
Changes in certain assets and liabilities:
Restricted cash	904	(2,570)
Accounts receivable	(1,578)	(631)
Expendable parts, supplies and fuel	(3,759)	(3,781)
Prepaid expenses	(2,055)	(23,891)
Other current assets	(303)	459
Accounts payable	14,514	5,951
Accrued liabilities	(5,299)	(8,472)
Air traffic liability	40,485	28,271
Net cash provided by operating activities	104,270	53,300
INVESTING ACTIVITIES:
Purchase of short-term investments	(212,013)	(49,915)
Proceeds from maturities of short-term investments	103,938	159,746
Purchase of property and equipment, including pre-delivery deposits	(51,246)	(63,294)
Proceeds from sale of property and equipment	230
Investment in unconsolidated affiliates, net	(3,140)	(463)
Decrease in deposits and other assets	5,608	28
Net cash (used in) provided by investing activities	(156,623)	46,102
FINANCING ACTIVITIES:
Cash dividends paid to shareholders		(14,942)
Excess tax benefits from stock option exercises	173	667
Proceeds from exercise of stock options	1,047	2,881
Proceeds from exercise of warrants		715
Proceeds from the issuance of long term debt	132,000
Repurchase of common stock	(1,800)	(13,149)
Principal payments on long term debt	(17,831)	(11,693)
Payments for deferred financing costs	(2,325)
Net cash provided by (used in) financing activities	111,264	(35,521)
Net change in cash and cash equivalents	58,911	63,881
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	113,293	90,239
CASH AND CASH EQUIVALENTS AT END OF PERIOD	172,204	154,120
NON-CASH TRANSACTIONS:
Deposits applied against flight equipment purchase	$ 1,277