Condensed Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 524,905	$ 416,816
Accounts receivable, net	32,807	22,740
Deferred income taxes	16,967	12,591
Other current assets	101,933	95,210
Total current assets	676,612	547,357
Property and equipment:
Flight equipment	4,073	2,648
Ground and other equipment	47,735	43,580
Less accumulated depreciation	(21,285)	(17,825)
Total property and equipment	30,523	28,403
Deposits on flight equipment purchase contracts	111,797	96,692
Aircraft maintenance deposits	143,631	122,379
Deferred heavy maintenance	102,332	80,533
Other long-term assets	42,166	44,520
Total assets	1,107,061	919,884
Current liabilities:
Accounts payable	23,097	24,166
Air traffic liability	205,786	131,414
Other current liabilities	151,516	121,314
Total current liabilities	380,399	276,894
Long-term deferred income taxes	43,554	33,216
Deferred credits and other long-term liabilities	24,670	27,239
Shareholders’ equity:
Common stock	7	7
Additional paid-in-capital	508,745	504,527
Treasury stock	(2,088)	(1,151)
Retained earnings	151,774	79,152
Total shareholders’ equity	658,438	582,535
Total liabilities and shareholders’ equity	$ 1,107,061	$ 919,884