REVENUE - Significant Categories of Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
REVENUE
Total Operating Revenues	$ 294,115	$ 226,525
Passenger
REVENUE
Total Operating Revenues	267,269	202,033
Scheduled Service
REVENUE
Total Operating Revenues	152,657	124,068
Charter Service
REVENUE
Total Operating Revenues	46,187	32,879
Ancillary
REVENUE
Total Operating Revenues	68,425	45,086
Cargo
REVENUE
Total Operating Revenues	23,361	21,053
Other
REVENUE
Total Operating Revenues	$ 3,485	$ 3,439