COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) aircraft	Mar. 31, 2021 USD ($)
Long-term Purchase Commitment [Line Items]
Deposit	$ 49,683	$ 54,399
Aircraft and Flight Equipment
Long-term Purchase Commitment [Line Items]
Commitment	$ 75,000
Aircraft and Flight Equipment
Long-term Purchase Commitment [Line Items]
Commitment, number of aircraft to be purchased | aircraft	4
Deposit	$ 7,500
Flight Simulator
Long-term Purchase Commitment [Line Items]
Commitment	9,745
Deposit	$ 2,934