Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
REVENUES	$ 509,668	$ 409,872	$ 995,528	$ 785,960
OPERATING EXPENSES
Salaries, wages and benefits	162,797	141,524	324,559	283,540
Fuel	73,102	36,592	133,460	67,034
Maintenance, materials and repairs	39,407	45,913	75,116	87,920
Depreciation and amortization	81,372	75,633	163,443	146,684
Travel	28,480	18,501	52,679	36,905
Contracted ground and aviation services	20,153	18,794	38,484	33,597
Rent	7,068	5,726	13,731	11,594
Landing and ramp	4,085	3,026	8,663	6,135
Insurance	2,326	3,068	4,878	6,204
Other operating expenses	20,361	14,750	40,204	31,173
government grants continuing operations	0	(38,274)	0	66,304
Operating Expenses	439,151	325,253	855,217	644,482
OPERATING INCOME	70,517	84,619	140,311	141,478
OTHER INCOME (EXPENSE)
Interest income	15	9	24	28
Non-service component of retiree benefit costs	5,388	4,456	10,776	8,913
Write off of Deferred Debt Issuance Cost	0	(6,505)	0	(6,505)
Non-service component of retiree benefit (costs) gains	(9,461)	(15,021)	(20,860)	(29,543)
Net gain on financial instruments	6,011	35,703	8,707	45,175
Other Nonoperating Income (Expense)	(1,267)	19,607	(5,976)	17,850
EARNINGS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	69,250	104,226	134,335	159,328
INCOME TAX EXPENSE		(24,357)	(30,329)	(37,169)
EARNINGS FROM CONTINUING OPERATIONS	54,210	79,869	104,006	122,159
EARNINGS (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAXES	882		882	65
NET EARNINGS	$ 55,092	$ 79,934	$ 104,888	$ 122,224
BASIC EARNINGS PER SHARE
Basic earnings per share from continuing operations (in dollars per share)	$ 0.73	$ 1.17	$ 1.41	$ 1.91
Discontinued operations (in dollars per share)	0.01	0	0.01	0
TOTAL BASIC EARNINGS PER SHARE (in dollars per share)	0.74	1.17	1.42	1.91
DILUTED EARNINGS PER SHARE
Diluted earnings per share from continuing operations (in dollars per share)	0.61	0.74	1.18	1.23
Discontinued operations (in dollars per share)	0.01	0	0.01	0
TOTAL DILUTED NET EARNINGS PER SHARE (in dollars per share)	$ 0.62	$ 0.74	$ 1.19	$ 1.23
WEIGHTED AVERAGE SHARES
Basic (in shares)	73,980	68,206	73,934	63,851
Diluted (in shares)	89,449	72,964	89,098	73,849
Significant Reconciling Items [Member]
OTHER INCOME (EXPENSE)
Non-service component of retiree benefit (costs) gains	$ (574)	$ (870)	$ (881)	$ (1,624)
Loss from non-consolidated affiliates	$ (3,220)	$ 965	$ (4,623)	$ (218)