REVENUE - Significant Categories of Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
REVENUE
Total Operating Revenue	$ 226,525	$ 127,611
Passenger
REVENUE
Total Operating Revenue	202,033	104,195
Scheduled Service
REVENUE
Total Operating Revenue	124,068	54,620
Charter Service
REVENUE
Total Operating Revenue	32,879	25,805
Ancillary
REVENUE
Total Operating Revenue	45,086	23,770
Cargo
REVENUE
Total Operating Revenue	21,053	21,585
Other
REVENUE
Total Operating Revenue	$ 3,439	$ 1,831