COMPANY BACKGROUND (Details) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Jun. 30, 2020 aircraft	Jun. 29, 2020 aircraft	Dec. 13, 2019 item	Apr. 11, 2018 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2021 aircraft $ / shares shares	Dec. 31, 2020 aircraft $ / shares shares	Mar. 31, 2021 $ / shares	Jan. 30, 2020 $ / shares
Additions | aircraft						11	21
Exercise price (in dollars per share) | $ / shares									$ 0.0005
Common stock-par value (in dollars per share) | $ / shares						$ 0.01	$ 0.01	$ 0.01
Warrants issued (in shares)					8,850,423	7,838,946	8,597,554
Amazon Agreement
Term of agreement			6 years
Number of extension option | item			2
Term of agreement			2 years
Threshold term of agreement			10 years
Number of aircrafts operated | aircraft	12	10
Warrants issued					9,482,606
Exercise price (in dollars per share) | $ / shares					$ 15.17
Warrants vested					632,183	252,869	758,608
Number of warrants that vest on achievement of each milestone					63,217
Milestone achievement for warrants to vest | $					$ 8,000
Cumulative warrants vested						1,643,660
Apollo Global Management, Inc. and its Subsidiaries
Exercise price (in dollars per share) | $ / shares				$ 0.0005
Common stock-par value (in dollars per share) | $ / shares				$ 0
Equity interest issued or Issuable, number of shares				5,326,755
Warrants issued (in shares)				40,005,885