Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
REVENUES	$ 465,955	$ 404,146	$ 1,251,915	$ 1,171,217
OPERATING EXPENSES
Salaries, wages and benefits	148,074	128,608	431,614	373,642
Fuel	50,176	36,202	117,210	116,788
Maintenance, materials and repairs	43,751	48,767	131,671	134,148
Depreciation and amortization	77,751	67,974	224,435	205,607
Travel	24,928	20,254	61,833	59,226
Contracted ground and aviation services	21,620	19,840	55,217	47,735
Rent	5,807	5,137	17,401	13,821
Landing and ramp	4,027	3,378	10,162	8,895
Insurance	3,178	3,119	9,382	7,295
Other operating expenses	17,205	18,623	48,378	49,577
government grants continuing operations	(30,322)	(21,726)	(96,626)	(31,547)
Operating Expenses	366,195	330,176	1,010,677	1,024,262
OPERATING INCOME	99,760	73,970	241,238	146,955
OTHER INCOME (EXPENSE)
Interest income	8	93	36	217
Non-service component of retiree benefit costs	4,457	2,897	13,370	8,693
Write off of Deferred Debt Issuance Cost	0	0	(6,505)	0
Non-service component of retiree benefit gains	(14,459)	(15,440)	(44,002)	(47,808)
Net gain (loss) on financial instruments	(7,378)	(53,393)	37,797	(56,072)
Other Nonoperating Income (Expense)	(18,519)	(68,328)	(669)	(106,732)
EARNINGS FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	81,241	5,642	240,569	40,223
INCOME TAX EXPENSE		(11,387)	(56,047)	(17,397)
EARNINGS (LOSS) FROM CONTINUING OPERATIONS	62,363	(5,745)	184,522	22,826
EARNINGS (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAXES	2,309	154	2,374	4,162
NET EARNINGS (LOSS)	$ 64,672	$ (5,591)	$ 186,896	$ 26,988
BASIC EARNINGS PER SHARE
Basic earnings per share from continuing operations (in dollars per share)	$ 0.85	$ (0.10)	$ 2.75	$ 0.39
Discontinued operations (in dollars per share)	0.03	0.01	0.03	0.07
TOTAL BASIC EARNINGS PER SHARE (in dollars per share)	0.88	(0.09)	2.78	0.46
DILUTED EARNINGS PER SHARE
Diluted earnings per share from continuing operations (in dollars per share)	0.81	(0.10)	2.14	0.38
Discontinued operations (in dollars per share)	0.03	0.01	0.03	0.07
TOTAL DILUTED NET EARNINGS PER SHARE (in dollars per share)	$ 0.84	$ (0.09)	$ 2.17	$ 0.45
WEIGHTED AVERAGE SHARES
Basic (in shares)	73,721	59,146	67,177	59,106
Diluted (in shares)	76,743	59,146	75,277	59,863
Asset Impairment Charges	$ 0	$ 0	$ 0	$ 39,075
Significant Reconciling Items [Member]
OTHER INCOME (EXPENSE)
Non-service component of retiree benefit gains	(371)	(797)	(1,995)	(2,133)
Loss from non-consolidated affiliates	$ (1,147)	$ (2,485)	$ (1,365)	$ (11,762)