Fair Value Measurements - Narrative (Details) $ in Thousands	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Mar. 12, 2025 USD ($)	Sep. 30, 2025 USD ($) aircraft	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) aircraft	Sep. 30, 2024 USD ($)	Mar. 13, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Indefinite-lived intangible assets		$ 83,482		$ 83,482		$ 83,482	$ 550
Allocated to fund in escrow accounts		$ (33,800)		$ (33,800)
Number of aircraft transferred from held-for-sale | aircraft		20		20
Gain (loss) on disposal of assets	$ (11,655)	$ 113,713	$ (3,191)	$ 114,041	$ 13,885
Aircraft
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gain (loss) on disposal of assets		3,200
Transferred from held for sale		429,500
Collateral Pledged | Credit Card Processing Agreement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash		100,000		100,000
Collateral Pledged | Exit Secured Notes Collateral
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash		170,700		170,700
Collateral Pledged | Control Agreements for Interest and Fee Payments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash		42,500		42,500
Collateral Pledged | Corporate Credit Cards
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash		6,000		6,000
Standby Letters of Credit | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Letters of credit, limit, amount		42,300		42,300
Letter of credit facility, amount outstanding		32,300		32,300
Standby Letters of Credit | Secured Debt | Collateral Pledged
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Restricted cash		$ 43,100		$ 43,100