Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
REVENUES	$ 203,040	$ 237,917
OPERATING EXPENSES
Salaries, wages and benefits	70,783	72,486
Fuel	5,788	34,841
Maintenance, materials and repairs	36,866	30,282
Depreciation and amortization	40,004	36,442
Travel	6,632	7,366
Contracted ground and aviation services	2,384	20,687
Rent	3,230	3,286
Landing and ramp	1,148	5,299
Insurance	1,357	1,262
Other operating expenses	7,205	8,036
Operating Expenses	175,397	219,987
OPERATING INCOME	27,643	17,930
OTHER INCOME (EXPENSE)
Interest income	23	32
Non-service component of retiree benefit costs	(5,362)	(3,548)
Net gain (loss) on financial instruments	(885)	1,869
Other Nonoperating Income (Expense)	(6,715)	(1,824)
EARNINGS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	20,928	16,106
INCOME TAX EXPENSE	(5,246)	(6,310)
EARNINGS FROM CONTINUING OPERATIONS	15,682	9,796
EARNINGS FROM DISCONTINUED OPERATIONS, NET OF TAXES	196	192
NET EARNINGS	$ 15,878	$ 9,988
BASIC EARNINGS PER SHARE
Basic earnings per share from continuing operations (in dollars per share)	$ 0.27	$ 0.17
Discontinued operations (in dollars per share)	0.00	0.00
TOTAL BASIC EARNINGS PER SHARE (in dollars per share)	0.27	0.17
DILUTED EARNINGS PER SHARE
Diluted earnings per share from continuing operations (in dollars per share)	0.26	0.13
Discontinued operations (in dollars per share)	0.01	0.00
TOTAL DILUTED NET EARNINGS PER SHARE (in dollars per share)	$ 0.27	$ 0.13
WEIGHTED AVERAGE SHARES
Basic (in shares)	58,840	59,133
Diluted (in shares)	59,558	64,949