AIRCRAFT - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) aircraft	Mar. 31, 2022 USD ($) aircraft	Sep. 30, 2022 USD ($) aircraft	Sep. 30, 2021 aircraft	Dec. 31, 2021 USD ($) aircraft	Dec. 31, 2020 aircraft
AIRCRAFT - Owned and Leased
Number of aircraft	54		54	47	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			2	3
Number of aircraft finance lease purchase options exercised			2
Number of aircrafts previously under operating leases	2			6
Additions			7	4
Aircraft maintenance deposits contra assets
AIRCRAFT - Owned and Leased
Remaining unamortized balance contra assets | $	$ 13,211		$ 13,211		$ 22,348
Contra asset, reduction | $			9,137
Remaining unamortized balance contra assets, used for purchase of aircraft | $			8,362
Over-market lease rates
AIRCRAFT - Owned and Leased
Remaining unamortized balance contra assets | $	132		132		10,363
Over market liabilities | $	2,958		2,958		$ 14,737
Reduction in over-market maintenance reserve liabilities | $			$ 11,779
Remaining unamortized balance contra assets, used for purchase of aircraft | $	173
Purchase of aircraft | $	$ 3,303
Boeing 737-800
AIRCRAFT - Owned and Leased
Number of aircraft	53		53
Boeing 737-700
AIRCRAFT - Owned and Leased
Number of aircraft	1		1
Passenger
AIRCRAFT - Owned and Leased
Number of aircraft	42		42	35	36	31
Number of aircraft modified to finance leases			2
Number of aircrafts financed	26		26
Number of aircrafts unencumbered	3		3	1
Additions			7	4