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2025 Chapter 11 Bankruptcy Proceedings - Narrative (Details) $ / shares in Units, $ in Thousands					1 Months Ended	2 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Nov. 07, 2025 USD ($) draw	Oct. 27, 2025 USD ($)	Oct. 14, 2025 USD ($)	Sep. 05, 2025	Sep. 30, 2025 USD ($)	Mar. 12, 2025 USD ($) $ / shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Oct. 31, 2025 USD ($)	Oct. 21, 2025 aircraft	Oct. 10, 2025 lease aircraft	Sep. 02, 2025 $ / shares	Mar. 13, 2025 $ / shares
Reorganization, Chapter 11 [Line Items]
Reorganization expense						$ (421,464)	$ 125,983	$ 0	$ 125,983	$ 0
Payment of reorganization items					$ 11,300
Common stock, par value (in dollars per share) \| $ / shares						$ 0.0001								$ 0.0001	$ 0.0001
Subsequent Event \| DIP Facility
Reorganization, Chapter 11 [Line Items]
Debtor-in-possession financing, amount arranged											$ 1,200,000
Subsequent Event \| DIP Facility, New Money Loans
Reorganization, Chapter 11 [Line Items]
Debtor-in-possession financing, amount arranged											475,000
Proceeds from lines of credit	$ 50,000		$ 200,000
Number Of Remaining Draws \| draw	2
Subsequent Event \| DIP Facility, Pre-Petition Secured Notes
Reorganization, Chapter 11 [Line Items]
Debtor-in-possession financing, amount arranged											$ 750,000
Aircraft Counterparties
Reorganization, Chapter 11 [Line Items]
Bankruptcy proceedings, rental holiday period				60 days
Aircraft Counterparties \| Subsequent Event
Reorganization, Chapter 11 [Line Items]
Leases authorized to be rejected, number of aircract \| aircraft												58
AerCap \| Subsequent Event
Reorganization, Chapter 11 [Line Items]
Bankruptcy proceedings, number of leases assumed \| lease													10
Bankruptcy proceedings, number of leases rejected \| lease													27
Bankruptcy proceedings, number of new leases entered \| lease													30
Bankruptcy proceedings, claims and disputes settlement, liquidity payment		$ 150,000
Bankruptcy proceedings, transfer of purchase rights and options, terms adjustment, number of aircraft \| aircraft													52
Bankruptcy proceedings, new purchase options, number of aircraft \| aircraft													10