OPERATING SEGMENTS (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)
OPERATING SEGMENTS
Number of operating segments | segment	2
Total Operating Revenues	$ 294,115	$ 226,525
Non-Fuel Operating Expenses	166,042	140,148
Aircraft Fuel	72,290	64,544
Total Operating Expenses	238,332	204,692
Operating Income (Loss)	55,783	21,833
Interest Income	2,741	24
Interest Expense	(8,630)	(8,562)
Other, net	(212)	(6,876)
Income Before Income Tax	49,682	6,419
Passenger
OPERATING SEGMENTS
Total Operating Revenues	270,754	205,472
Non-Fuel Operating Expenses	140,637	120,810
Aircraft Fuel	72,266	64,544
Total Operating Expenses	212,903	185,354
Operating Income (Loss)	57,851	20,118
Cargo
OPERATING SEGMENTS
Total Operating Revenues	23,361	21,053
Non-Fuel Operating Expenses	25,405	19,338
Aircraft Fuel	24	0
Total Operating Expenses	25,429	19,338
Operating Income (Loss)	$ (2,068)	$ 1,715