SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Contract liabilities	$ 11,500	$ 2,800
Revenue	46,288	35,573
Aircraft sales
Disaggregation of Revenue [Line Items]
Revenue	38,150	21,443
Managed Aircraft
Disaggregation of Revenue [Line Items]
Revenue	7,224	14,107
Subscription
Disaggregation of Revenue [Line Items]
Revenue	$ 914	$ 23