Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Revenue:
Passenger	$ 591,496	$ 556,929	$ 1,592,095	$ 1,525,461
Other	80,341	74,809	225,512	217,852
Total	671,837	631,738	1,817,607	1,743,313
Operating Expenses:
Wages and benefits	141,410	125,884	410,936	369,875
Aircraft fuel, including taxes and delivery	94,818	105,483	248,516	329,329
Maintenance, materials and repairs	51,812	56,196	166,901	168,512
Aircraft and passenger servicing	33,971	30,284	93,245	87,948
Aircraft rent	32,891	29,544	92,345	86,732
Commissions and other selling	29,480	30,305	93,936	91,217
Other rentals and landing fees	28,926	24,728	78,338	70,807
Depreciation and amortization	27,495	26,061	81,629	78,777
Purchased services	25,614	19,458	72,889	60,540
Other	31,565	29,118	94,279	82,319
Total	497,982	477,061	1,433,014	1,426,056
Operating Income	173,855	154,677	384,593	317,257
Nonoperating Income (Expense):
Interest expense and amortization of debt discounts and issuance costs	(8,539)	(13,506)	(28,453)	(42,742)
Gains (losses) on fuel derivatives	(3,601)	(25,009)	15,421	(28,670)
Interest income	1,113	691	3,044	2,052
Capitalized interest	719	698	1,407	2,966
Loss on extinguishment of debt	0	(54)	(9,993)	(7,296)
Other, net	612	(4,515)	9,884	(9,325)
Total	(9,696)	(41,695)	(8,690)	(83,015)
Income Before Income Taxes	164,159	112,982	375,903	234,242
Income tax expense	61,705	42,953	142,413	89,496
Net Income	$ 102,454	$ 70,029	$ 233,490	$ 144,746
Net Income Per Share
Basic (in dollars per share)	$ 1.92	$ 1.30	$ 4.37	$ 2.67
Diluted (in dollars per share)	$ 1.91	$ 1.15	$ 4.35	$ 2.32