AIRCRAFT - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) aircraft	Jun. 30, 2021 aircraft	Aug. 10, 2022 USD ($)	Dec. 31, 2021 USD ($) aircraft	Dec. 31, 2020 aircraft
AIRCRAFT - Owned and Leased
Number of aircraft	53	45		48	43
Number of aircraft modified to finance leases	2
Amount reclassified to finance lease, right-of-use asset | $	$ 9,687
Over-market maintenance reserve liability reclassified to finance lease liability | $	$ 6,023
Number of aircrafts financed using proceeds from issuance of pass-through trust certificates	5
Number of aircrafts financed using finance lease arrangement	1	2,000
Number of aircrafts previously under operating leases		6,000
Subsequent Event
AIRCRAFT - Owned and Leased
Annual payment | $			$ 2,220
Aircraft maintenance deposits contra assets
AIRCRAFT - Owned and Leased
Remaining unamortized balance contra assets | $	$ 21,897			$ 22,348
Over-market lease rates
AIRCRAFT - Owned and Leased
Remaining unamortized balance contra assets | $	344			10,363
Over market liabilities | $	7,027			$ 14,737
Reduction in over-market maintenance reserve liabilities | $	$ 7,710
Boeing 737-800
AIRCRAFT - Owned and Leased
Number of aircraft	52
Boeing 737-700
AIRCRAFT - Owned and Leased
Number of aircraft	1
Passenger
AIRCRAFT - Owned and Leased
Number of aircraft	41	33		36	31
Number of aircraft modified to finance leases	2
Number of aircrafts financed	25
Number of aircrafts unencumbered	1