Leases (Tables)

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Schedule of Future Minimum Lease Payments for Finance Leases

The following table provides details of the Company's future minimum lease payments under finance lease liabilities and operating lease liabilities recorded on the Company's consolidated balance sheets as of December 31, 2025. The table does not include commitments that are contingent on events or other factors that are currently uncertain and unknown.

	Finance Leases		Operating Leases				Total Operating and Finance Lease Obligations
			Aircraft and Spare Engine Leases		Property Facility Leases
	(in thousands)
2026	$	141	$	266,608	$	4,894	$	271,643
2027	93		250,552		4,140		254,785
2028	67		231,639		2,757		234,463
2029	5		226,356		2,132		228,493
2030	—		214,366		1,513		215,879
2031 and thereafter	—		2,168,914		140,124		2,309,038
Total minimum lease payments	$	306	$	3,358,435	$	155,560	$	3,514,301
Less amount representing interest	26		1,385,410		133,651		1,519,087
Present value of minimum lease payments	$	280	$	1,973,025	$	21,909	$	1,995,214
Less current portion (1)	127		118,273		4,282		122,682
Long-term portion (1)	$	153	$	1,854,752	$	17,627	$	1,872,532

(1) Certain of the Company's lease obligations are included within liabilities subject to compromise on the Company's consolidated balance sheets and may be settled at an amount lower than the contractually future minimum lease payments; therefore, operating lease liability balances included within this table will differ from the operating lease liability balances included within the Company's consolidated balance sheets.

Schedule of Future Minimum Lease Payments for Operating Leases

The following table provides details of the Company's future minimum lease payments under finance lease liabilities and operating lease liabilities recorded on the Company's consolidated balance sheets as of December 31, 2025. The table does not include commitments that are contingent on events or other factors that are currently uncertain and unknown.

	Finance Leases		Operating Leases				Total Operating and Finance Lease Obligations
			Aircraft and Spare Engine Leases		Property Facility Leases
	(in thousands)
2026	$	141	$	266,608	$	4,894	$	271,643
2027	93		250,552		4,140		254,785
2028	67		231,639		2,757		234,463
2029	5		226,356		2,132		228,493
2030	—		214,366		1,513		215,879
2031 and thereafter	—		2,168,914		140,124		2,309,038
Total minimum lease payments	$	306	$	3,358,435	$	155,560	$	3,514,301
Less amount representing interest	26		1,385,410		133,651		1,519,087
Present value of minimum lease payments	$	280	$	1,973,025	$	21,909	$	1,995,214
Less current portion (1)	127		118,273		4,282		122,682
Long-term portion (1)	$	153	$	1,854,752	$	17,627	$	1,872,532

(1) Certain of the Company's lease obligations are included within liabilities subject to compromise on the Company's consolidated balance sheets and may be settled at an amount lower than the contractually future minimum lease payments; therefore, operating lease liability balances included within this table will differ from the operating lease liability balances included within the Company's consolidated balance sheets.

Schedule of Lease Costs, Lease Terms and Discount Rates

The table below presents information for lease costs related to the Company's finance and operating leases:

	Successor		Predecessor
	Period from March 13, 2025 through December 31, 2025		Period from January 1, 2025 through March 12, 2025		Twelve Months Ended December 31, 2024
	(in thousands)
Finance lease cost
Amortization of leased assets	$	183	$	38	$	277
Interest of lease liabilities	19		5		33
Operating lease cost
Operating lease cost (1)	423,031		114,508		517,016
Short-term lease cost (1)	22,789		5,574		37,294
Variable lease cost (1)	189,232		55,750		272,087
Total lease cost	$	635,254	$	175,875	$	826,707

(1) Expenses are classified within aircraft rent and landing fees and other rents on the Company's consolidated statements of operations.

The table below presents lease-related terms and discount rates as of December 31, 2025:

	Successor		Predecessor
	December 31, 2025		December 31, 2024
Weighted-average remaining lease term
Operating leases	21.0 years		15.1 years
Finance leases	2.4 years		2.9 years
Weighted-average discount rate
Operating leases	7.81	%	7.11	%
Finance leases	6.64	%	5.91	%