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REVENUE RECOGNITION - Schedule of Deferred Revenue (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Deferred revenue - total | $ 702,638 | $ 724,229
Less: Deferred revenue - current | (702,174) | (723,246)
Deferred revenue - non-current | 464 | 983
Flights - Prepaid Blocks |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue - total | 673,052 | 686,413
Memberships - annual dues |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue - total | 27,576 | 33,890
Memberships - initiation fees |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue - total | 1,249 | 2,377
Flights - credits |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue - total | 751 | 1,366
Other |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue - total | $ 10 | $ 183

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