OPERATING SEGMENTS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
OPERATING SEGMENTS
Number of operating segments | segment	2
Total Operating Revenue	$ 226,525	$ 127,611
Non-Fuel Operating Expenses	140,148	105,275
Aircraft Fuel	64,544	24,274
Special Items, net	0	(26,871)
Total Operating Expenses	204,692	102,678
Operating Income	21,833	24,933
Interest Income	24	15
Interest Expense	(8,562)	(7,121)
Other, net	(6,876)	(5)
Income Before Income Tax	6,419	17,822
Passenger
OPERATING SEGMENTS
Total Operating Revenue	205,472	106,026
Non-Fuel Operating Expenses	120,810	87,205
Aircraft Fuel	64,544	24,253
Special Items, net	0	(18,206)
Total Operating Expenses	185,354	93,252
Operating Income	20,118	12,774
Cargo
OPERATING SEGMENTS
Total Operating Revenue	21,053	21,585
Non-Fuel Operating Expenses	19,338	18,070
Aircraft Fuel	0	21
Special Items, net	0	(8,665)
Total Operating Expenses	19,338	9,426
Operating Income	$ 1,715	$ 12,159