Loss (Gain) on Disposal of Assets	12 Months Ended
Loss (Gain) on Disposal of Assets	Dec. 31, 2025
Discontinued Operations and Disposal Groups [Abstract]
Loss (Gain) on Disposal of Assets	Loss (Gain) on Disposal of Assets During the Successor Period, the Company recorded a net gain of $109.1 million, within loss (gain) on disposal of assets in the consolidated statements of operations. This net gain included a $117.7 million gain recorded as a result of 14 sale leaseback transactions entered into during the third quarter of 2025, related to previously owned engines, which resulted in operating leases. Refer to Note 15, Leases for additional information on the sale leaseback transactions. In addition, these net gains included a $3.2 million gain related to the reclassification of aircraft previously classified as held for sale, which were reclassified to property and equipment during the third quarter of 2025. Refer to Note 19, Fair Value Measurements, for additional information regarding this reclassification. Furthermore, during the Successor Period, the Company recorded a $1.8 million gain as a result of one aircraft sale leaseback transaction related to a new aircraft delivery completed during the second quarter of 2025. These gains were partially offset by $8.7 million losses during the Successor Period. These losses resulted from adjustments to previously recorded impairment charges recognized in the fourth quarter of 2024, reflecting a change in estimated costs to sell associated with the Company’s aircraft sale and purchase agreement with GA Telesis, LLC ("GAT"), entered into on October 29, 2024, prior to the reclassification of these aircraft to fixed assets during the latter part of the third quarter of 2025. In addition, during the Successor Period, the Company recognized a $2.0 million loss related to the sale of one aircraft to GAT in July 2025 and a $2.9 million in net loss, related to the write-off of obsolete assets and other adjustments. During the Current Predecessor Period, the Company recorded a loss of $11.7 million within loss (gain) on disposal of assets in the consolidated statements of operations. This loss included an $18.5 million adjustment to previously recorded impairment charges in the fourth quarter of 2024, reflecting a change in estimated costs to sell associated with the Company’s aircraft sale and purchase agreement with GAT entered into on October 29, 2024, as well as $0.4 million in losses related to the write-off of obsolete assets and other adjustments. These losses were partially offset by a $6.4 million gain recorded as a result of two aircraft sale leaseback transactions related to new aircraft deliveries completed during the Current Predecessor Period and a $0.9 million net gain true-up recorded related to the sale of A319 airframes and engines sold in 2024. During the twelve months ended December 31, 2024, the Company recorded a loss of $273.9 million in loss (gain) on disposal of assets in the consolidated statement of operations. Loss (gain) on disposal of assets for the twelve months ended December 31, 2024 included $282.5 million in impairment charges recorded during the fourth quarter 2024. These charges are associated with the Company's plan to early retire and sell 23 A320ceo and A321ceo aircraft, in accordance with the aircraft sale and purchase agreement with GAT entered into on October 29, 2024. For additional information, refer to Note 1, Summary of Significant Accounting Policies. During the first quarter of 2024, the Company completed five sale leaseback transactions (on aircraft previously owned by the Company) of which two resulted in operating leases and three would have been deemed finance leases resulting in failed sale leaseback transactions. As a result of the two sale leaseback transactions that resulted in operating leases, the Company recorded a related loss of $1.7 million within loss (gain) on disposal of assets during the twelve months ended December 31, 2024. Refer to Note 15, Leases for additional information on the five sale leaseback transactions. In addition, loss (gain) on disposal of assets for the twelve months ended December 31, 2024, included a $25.1 million gain recorded as a result of eight aircraft sale leaseback transactions related to new aircraft deliveries completed during 2024, a $0.4 million loss recorded as a result of the sale of two aircraft to GAT, an $11.9 million loss recorded as a result of the sale of 17 A319 airframes and 38 A319 engines during 2024, and $2.5 million in losses during the twelve months ended December 31, 2024, related to the write-off of obsolete assets and other adjustments. During twelve months ended December 31, 2023, the Company recorded a loss of $34.0 million in loss (gain) on disposal of assets in the consolidated statement of operations. During December 2023, the Company completed 20 sale leaseback transactions (on aircraft previously owned by the Company) of which, 6 resulted in operating leases and 14 would have been deemed finance leases resulting in failed sale leaseback transactions. As a result of the 6 sale leaseback transactions that resulted in operating leases, the Company recorded a related loss of $32.1 million within loss (gain) on disposal of assets. Loss (gain) on disposal of assets for the twelve months ended December 31, 2023 also included a $3.0 million net gain recorded as a result of 10 aircraft sale leaseback transactions related to new aircraft deliveries completed during the twelve months ended December 31, 2023. During the twelve months ended December 31, 2023, the Company completed the sale of 12 A319 airframes and 20 A319 engines and recorded a related net loss of $1.6 million. In addition, the Company recorded a $3.3 million loss primarily related to the disposal of obsolete assets.