AIRCRAFT - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended
	May 06, 2022 USD ($) aircraft	Mar. 31, 2022 aircraft	Mar. 31, 2021 aircraft	Dec. 31, 2021 aircraft	Dec. 31, 2020 aircraft
AIRCRAFT - Owned and Leased
Number of aircraft		50	43	48	43
Additions		4	5
Number of aircraft modified to finance leases		2
Number of aircrafts previously under operating leases			5
Subsequent Event
AIRCRAFT - Owned and Leased
Lease term	6 years
Annual payment | $	$ 2,220
Previously Leased Air Transportation Equipment | Subsequent Event
AIRCRAFT - Owned and Leased
Purchase price | $	16,784
Aircraft and Flight Equipment | Subsequent Event
AIRCRAFT - Owned and Leased
Purchase price | $	$ 75,000
Number of aircraft purchased	4
Boeing 737-800
AIRCRAFT - Owned and Leased
Number of aircraft		49
Boeing 737-800 | Aircraft and Flight Equipment
AIRCRAFT - Owned and Leased
Additions		2
Boeing 737-700
AIRCRAFT - Owned and Leased
Number of aircraft		1