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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 15, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Issuance Costs, Net |  | $ (13) |  | $ (13) |  | $ (15)
Total |  | 4,625 |  | 4,625 |  | 2,471
Less current portion |  | (515) |  | (515) |  | (289)
Long-Term Debt, Net of Current Portion |  | $ 4,159 |  | $ 4,159 |  | $ 2,182
Debt, Weighted Average Interest Rate |  | 6.20% |  | 6.20% |  |
Weighted-average fixed-interest rate |  | 6.00% |  | 6.00% |  | 3.40%
Weighted-average variable-interest rate |  | 7.00% |  | 7.00% |  | 6.80%
Long-term debt payments |  |  |  | $ 279 | $ 242 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 39.06 |  | $ 39.06 |  |
Proceeds from issuance of debt |  |  |  | $ 344 | $ 313 |
Proceeds from Issuance of Long-term Debt |  |  |  | $ 415 |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  | $ 13 |  |  |
Proceeds from Secured Notes Payable | $ 625 |  |  |  |  |
Debt, Weighted Average Interest Rate |  | 6.20% |  | 6.20% |  |
Proceeds from Issuance of Long-term Debt |  |  |  | $ 415 |  |
Subsequent Event [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | 436 |  |  |  |  |
Scheduled Debt Payments [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt payments |  |  |  | 279 |  |
Scheduled Debt Payments made by Hawaiian |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt payments |  |  |  | 19 |  |
Floating Interest Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost | 110 |  |  |  |  |
US Treasury CARES Act Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Warrant Issued |  |  |  | 30 |  |
Proceeds from Issuance of Long-Term Debt, Cash proceeds [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  | $ 347 |  |  |  |
Proceeds from Issuance of Long-term Debt |  | 347 |  |  |  |
Proceeds from Issuance of Long-Term Debt, Noncash proceeds [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  | 68 |  |
Proceeds from Issuance of Long-term Debt |  |  |  | 68 |  |
fixed-rate notes payable due through 2032 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | 271 |  | 271 |  | $ 80
Fixed-rate PSP notes payable due through 2031 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | 712 |  | 712 |  | 600
Fixed-rate EETC's payable due through 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | 867 |  | 867 |  | 835
Fixed-rate Japanese Yen payable due through 2031 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | 106 |  | 106 |  | 0
Fixed-rate Hawaiian Loyalty Program due through 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | 991 |  | 991 |  | 0
Variable-rate notes payable due through 2036 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | 1,691 |  | 1,691 |  | 971
Excluding finance leases [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-Term Debt, Net of Current Portion |  | 4,110 |  | 4,110 |  | $ 2,182
Variable Rate debt with interest rate swap [Member] | Interest rate swaps agreements [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  | 210 |  | 210 |  |
Derivative, Notional Amount |  | $ 210 |  | $ 210 |  |
Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 750 |  |  |  |  |

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