REVENUE - Significant Categories of Operating Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
REVENUE
Total Operating Revenue	$ 219,067	$ 149,189	$ 445,591	$ 276,802
Passenger
REVENUE
Total Operating Revenue	195,362	125,130	397,394	229,325
Scheduled Service
REVENUE
Total Operating Revenue	108,412	67,073	232,479	121,693
Charter Service
REVENUE
Total Operating Revenue	42,749	28,898	75,628	54,703
Ancillary
REVENUE
Total Operating Revenue	44,201	29,159	89,287	52,929
Cargo
REVENUE
Total Operating Revenue	21,190	22,098	42,243	43,684
Other
REVENUE
Total Operating Revenue	$ 2,515	$ 1,961	$ 5,954	$ 3,793