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LONG-TERM DEBT - Narrative (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2023 USD ($) | Sep. 20, 2023 USD ($) shares | Oct. 14, 2022 USD ($) aircraft | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) aircraft | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Nov. 09, 2023 USD ($) | Sep. 30, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization (accretion) of deferred financing costs and debt discount |  |  |  |  |  | $ (1,328,000) | $ 1,124,000 |  |  |
Long-term debt |  |  |  | $ 597,352,000 |  | 597,352,000 |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  | 297,800,000 |  | 297,800,000 |  | $ 297,800,000 | $ 44,900,000 |
Debt instrument, fair value disclosure |  |  |  |  |  |  |  | 9,400,000 |  |
Initial Issuance |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Allocation on relative fair value basis |  |  |  |  |  |  |  |  | $ 64,200,000 |
Issuance costs |  |  |  |  |  |  |  |  |  | $ 25,400,000
Deferred Issuance |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 529,926,270 |  |  |  |  |  |  |  |
Allocation on relative fair value basis |  |  |  |  |  |  |  | 240,900,000 |  |
Private Placement, Reallocated Shares |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred issuance costs |  |  |  |  |  |  |  | 30,600,000 |  |
Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance costs |  |  |  |  |  |  |  |  |  | 4,100,000
Common Class A | Initial Issuance |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) | shares |  | 141,313,671 |  |  |  |  |  |  |  |
Equipment Notes | Notes Payable |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  | $ 270,000,000 |  |  |  |  |  |  |
Stated rate |  |  | 12.00% |  |  |  |  |  |  |
Net proceeds |  |  | $ 259,200,000 |  |  |  |  |  |  |
Annual amortization of principal percent |  |  | 10.00% |  |  |  |  |  |  |
Debt instrument, restrictive covenants, quarterly minimum liquidity |  | $ 125,000,000 |  |  |  |  |  |  |  |
Minimum liquidity |  | $ 75,000,000 |  |  |  |  |  |  |  |
Debt instrument, restrictive covenants, minimum liquidity, deposit |  |  |  |  |  | 20,000,000 |  | $ 20,000,000 |  |
Debt instrument, maturity trigger period |  | 90 days |  |  |  |  |  |  |  |
Debt redeemed |  |  |  | 26,900,000 |  | 26,900,000 |  |  |  |
Amortization (accretion) of deferred financing costs and debt discount |  |  |  | 2,200,000 | $ 900,000 | $ 2,700,000 | $ 1,800,000 |  |  |
Equipment Notes | Notes Payable | Not subject to first-priority liens |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  | 14 |  |  |  |
Equipment Notes | Notes Payable | Asset Pledged as Collateral |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  | 108 |  |  |  |
Flight equipment |  |  |  | 259,400,000 |  | $ 259,400,000 |  |  |  |
Equipment Notes | Notes Payable | Aircraft |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  | 134 |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance costs |  |  |  |  |  |  |  |  |  | 29,500,000
Credit Agreement | Term Loan and Revolving Credit Facility | Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount | $ 390,000,000 | $ 350,000,000 |  |  |  |  |  |  |  |
Stated rate |  | 10.00% |  |  |  |  |  |  |  |
Amortization (accretion) of deferred financing costs and debt discount |  |  |  | $ (1,700,000) |  | $ (4,100,000) |  |  |  |
Proceeds from long-term debt, net | 39,200,000 | $ 343,000,000 |  |  |  |  |  |  |  |
Increment principal amount | 40,000,000 |  |  |  |  |  |  |  |  |
Credit agreement interest rate |  | 2.00% |  |  |  |  |  |  |  |
Long-term debt | 8,700,000 |  |  |  |  |  |  |  |  | 41,400,000
Unamortized debt issuance costs | 700,000 |  |  |  |  |  |  |  |  | 3,400,000
Unamortized debt discount | 30,600,000 |  |  |  |  |  |  |  |  | $ 305,200,000
Credit Agreement | Term Loan and Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate original principal amount | $ 100,000,000 | $ 100,000,000 |  |  |  |  |  |  |  |

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