CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
OPERATING REVENUES:
Passenger	$ 773,107	$ 800,548	$ 1,515,605	$ 1,556,187
Ground handling and other	15,310	16,026	33,210	32,773
Total operating revenues	788,417	816,574	1,548,815	1,588,960
OPERATING EXPENSES:
Salaries, wages and benefits	298,573	310,844	601,418	628,486
Aircraft maintenance, materials and repairs	156,319	171,722	314,576	349,984
Aircraft rentals	68,442	79,449	138,854	159,783
Depreciation and amortization	64,659	64,252	130,350	126,567
Aircraft fuel	31,192	58,018	58,492	105,243
Ground handling services	20,117	32,314	44,089	69,332
Special charges		4,713		4,713
Other operating expenses	79,183	82,018	157,028	159,382
Total operating expenses	718,485	803,330	1,444,807	1,603,490
OPERATING INCOME (LOSS)	69,932	13,244	104,008	(14,530)
OTHER INCOME (EXPENSE):
Interest income	697	511	1,336	1,060
Interest expense	(18,081)	(16,138)	(36,546)	(31,814)
Other, net		(2,618)		(2,891)
Total other expense, net	(17,384)	(18,245)	(35,210)	(33,645)
INCOME (LOSS) BEFORE INCOME TAXES	52,548	(5,001)	68,798	(48,175)
PROVISION (BENEFIT) FOR INCOME TAXES	21,073	9,736	27,703	(10,551)
NET INCOME (LOSS)	$ 31,475	$ (14,737)	$ 41,095	$ (37,624)
BASIC EARNINGS (LOSS) PER SHARE (in dollars per share)	$ 0.61	$ (0.29)	$ 0.80	$ (0.73)
DILUTED EARNINGS (LOSS) PER SHARE (in dollars per share)	$ 0.61	$ (0.29)	$ 0.79	$ (0.73)
Weighted average common shares:
Basic (in shares)	51,357	51,183	51,407	51,310
Diluted (in shares)	51,971	51,183	52,182	51,310
Dividends declared per share (in dollars per share)	$ 0.04	$ 0.04	$ 0.08	$ 0.08
COMPREHENSIVE INCOME (LOSS):
Net income (Loss)	$ 31,475	$ (14,737)	$ 41,095	$ (37,624)
Net unrealized appreciation (depreciation) on marketable securities, net of taxes	(223)	42	78	65
TOTAL COMPREHENSIVE INCOME (LOSS)	$ 31,252	$ (14,695)	$ 41,173	$ (37,559)