REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	$ 8,918	$ 3,066	$ 24,483	$ 10,655
Contract liabilities, revenue recognized			5,854	453
Contract liabilities, customer deposits, current	1,000		1,000		$ 0
Contract liabilities, customer deposits, non current	3,885		3,885		$ 2,660
Cost of revenues	2,741	1,189	5,670	3,299
Revenue, remaining performance obligation, amount	18,679		18,679
Pre Certified Air Craft Agreement Contracts
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	0	0	0	0
Cost of revenues	0	0	0	0
United States
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	8,667	3,066	24,232	10,655
International
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenues	251	$ 0	251	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 10,058		$ 10,058
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months		12 months