Summary of Significant Accounting Policies - Operating Lease Right-of-Use Asset and Liabilities (Details) $ in Millions	Dec. 31, 2025 USD ($) aircraft aircraft_engine
Accounting Policies [Abstract]
Leases rejected, number of aircraft \| aircraft	83
Leases rejected, number of engines \| aircraft_engine	3
Liabilities subject to compromise, operating lease liabilities \| $	$ 2,189.8

Liabilities Subject To Compromise, Operating Lease Liabilities

No definition available.

Name:	flyy_LiabilitiesSubjectToCompromiseOperatingLeaseLiabilities
Namespace Prefix:	flyy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant