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Commitments and Contingencies - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Feb. 28, 2023 lawsuit | Dec. 31, 2022 lawsuit | Jul. 14, 2022 pilot_instructor
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |  |  |  |
Restricted assets pledged under letter of credit |  | $ 72 |  | $ 72 |  |  |  |
Letters of credit |  | 59 |  | 59 |  |  |  |
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements |  | $ 9 |  | $ 9 |  |  |  |
Percentage of employees represented by unions under collective bargaining agreements |  | 52.00% |  | 52.00% |  |  |  |
Percentage of employees represented by unions under collective bargaining agreements, will become amendable within one year |  | 23.00% |  | 23.00% |  |  |  |
Collective bargaining agreement contract extension period | 2 years |  |  |  |  |  |  |
One-time bonus payment | $ 95 |  |  |  |  |  |  |
Union contract costs | $ 26 | $ 26 | $ 8 | $ 26 | $ 104 |  |  |
Number of flight instructor | pilot_instructor |  |  |  |  |  |  |  | 35
Employment agreement term |  |  |  | 5 years |  |  |  |
Automatic renewal term, employment agreement, term |  |  |  | 5 years |  |  |  |
Renewal notice period, employment agreement, period |  |  |  | 90 days |  |  |  |
Loss contingency, pending claims, number | lawsuit |  |  |  |  |  | 4 | 4 |
JFK Millennium Partner LLC |  |  |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |  |  |  |
Letters of credit |  | $ 65 |  | $ 65 |  |  |  |
Ownership percentage |  | 5.00% |  | 5.00% |  |  |  |

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