COMMITMENT AND CONTINGENCIES - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) aircraft	Sep. 30, 2024 USD ($) aircraft	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) aircraft	Sep. 30, 2023 USD ($)	Aug. 30, 2024 employee	Jan. 31, 2024	Dec. 31, 2023 USD ($) aircraft	May 31, 2023 USD ($) aircraft	May 05, 2023 USD ($) aircraft	Dec. 31, 2022 USD ($) aircraft
Long-Term Purchase Commitment [Line Items]
Deposit funded				$ 1,000	$ 0
Operating lease expense		$ 78	$ 117	312	351
Variable lease cost		1,900	6,600	7,700	12,000
Number of employees terminated | employee						230
Honda Aircraft
Long-Term Purchase Commitment [Line Items]
Decrease in accounts payable		1,000		1,000
Aircraft
Long-Term Purchase Commitment [Line Items]
Short-term lease cost		40	183	196	513
Airport Facilities
Long-Term Purchase Commitment [Line Items]
Short-term lease cost		21	$ 16	57	54
Line of Credit | SAC Leasing G280 LLC Credit Facility
Long-Term Purchase Commitment [Line Items]
Deposit funded	$ 9,000
Line of credit facility, maximum borrowing capacity	40,500	40,500		40,500
Line of credit facility, remaining borrowing capacity	$ 0	$ 0		$ 0
HondaJet HA-420
Long-Term Purchase Commitment [Line Items]
Purchase obligation, number of aircrafts | aircraft									23	23
Purchase obligation									$ 161,100	$ 161,100
Number of assets disposed of | aircraft								2
Deposits assets								$ 1,300
Number of assets delivered | aircraft	2	2		2
Gulfstream G-280
Long-Term Purchase Commitment [Line Items]
Purchase obligation, number of aircrafts | aircraft	4	4		4				4			4
Purchase obligation	$ 23,250	$ 23,250		$ 23,250				$ 79,000			$ 79,000
Number of assets to be delivered, year one | aircraft	3	3		3
Deposits assets	$ 48,000	$ 48,000		$ 48,000				$ 39,000
Deposits assets, non-refundable	36,000	36,000		36,000
Liquidated damages per aircraft	$ 3,000	$ 3,000		3,000
Prepayments made in the period				9,000	18,000
Prepayments funded through the SAC Leasing G280 credit facility				9,000	15,000
Purchase obligation prepayments paid by the Company				$ 0	$ 3,000
Number of assets delivered | aircraft	1	1		1
Deposits assets retained	$ 3,000	$ 3,000		$ 3,000
Gulfstream G-280 | SAC Leasing G280 LLC Credit Facility
Long-Term Purchase Commitment [Line Items]
Deposits assets	$ 12,000	$ 12,000		$ 12,000
Minimum | Airport Facilities
Long-Term Purchase Commitment [Line Items]
Operating lease, remaining contractual term	1 year	1 year		1 year
Maximum | Airport Facilities
Long-Term Purchase Commitment [Line Items]
Operating lease, remaining contractual term	11 months	11 months		11 months
Aircraft Leases, Fixed
Long-Term Purchase Commitment [Line Items]
Operating lease, term							5 years				5 years
Operating lease discount rate							12.00%				12.00%
Aircraft Leases, Variable | Minimum
Long-Term Purchase Commitment [Line Items]
Operating lease, remaining contractual term	1 year	1 year		1 year
Operating lease, renewal term	3 months	3 months		3 months
Aircraft Leases, Variable | Maximum
Long-Term Purchase Commitment [Line Items]
Operating lease, remaining contractual term	5 years	5 years		5 years
Operating lease, renewal term	12 months	12 months		12 months