REVENUE - Schedule of Disaggregates Revenue by Service Type and the Timing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 736,495	$ 792,104	$ 1,253,317
Services transferred at a point in time: | Flights, net of discounts and incentives
Disaggregation of Revenue [Line Items]
Revenue	622,688	633,865	884,065
Services transferred at a point in time: | Aircraft management
Disaggregation of Revenue [Line Items]
Revenue	0	9,537	159,150
Services transferred at a point in time: | Other
Disaggregation of Revenue [Line Items]
Revenue	82,391	89,867	102,352
Services transferred over time: | Aircraft management
Disaggregation of Revenue [Line Items]
Revenue	0	170	16,679
Services transferred over time: | Other
Disaggregation of Revenue [Line Items]
Revenue	2,529	1,051	8,214
Services transferred over time: | Memberships
Disaggregation of Revenue [Line Items]
Revenue	$ 28,887	$ 57,614	$ 82,857