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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Commitments, Contingencies and Other Contractual Arrangements - Employees (Details) $ in Millions						1 Months Ended	2 Months Ended	10 Months Ended	12 Months Ended
	Jan. 01, 2026	Nov. 01, 2025 flightAttendant pilot	Oct. 01, 2025 pilot	Jan. 01, 2024	Mar. 01, 2018	Mar. 31, 2022	Mar. 12, 2025 USD ($) pilot employee	Dec. 31, 2025 USD ($) employeeGroup employee	Dec. 31, 2025 USD ($) employeeGroup employee	Nov. 06, 2025 agreement	Dec. 31, 2024 USD ($)
Loss Contingencies [Line Items]
Agreements in principle reached, number of unions \| agreement										2
Number of pilots furloughed (approximately) \| pilot		270					200
Furlough expenses							$ 0.9	$ 7.2
Number of positions eliminated from various departments (approximately) \| employee							200
Expenses related to eliminated positions							$ 1.8
Number of pilots downgraded during period (approximately) \| pilot			140
Number of flight attendants furloughed during period (approximately) \| flightAttendant		1,800,000
Accrued health care claims								$ 13.4	$ 13.4		$ 11.6
Spirit Aviation Holdings, Inc. Pilots’ Retirement Savings Plan
Loss Contingencies [Line Items]
Defined contribution 401(k) plan, employer contribution, percent of employees' gross pay				16.00%	11.00%	15.00%			16.00%
Spirit Aviation Holdings, Inc. Pilots’ Retirement Savings Plan \| Subsequent Event
Loss Contingencies [Line Items]
Percent reduction in hourly pay	8.00%
Defined contribution 401(k) plan, employer contribution, percent of employees' gross pay	8.00%
Aircraft Maintenance Technicians (AMTs)
Loss Contingencies [Line Items]
Number of employees included n union application (approximately) \| employee								455	455
Number of employees, total \| Unionized employees concentration risk
Loss Contingencies [Line Items]
Number of union-represented employee groups \| employeeGroup								6	6
Concentration of risk (greater than)									81.00%
Number of employees, total \| Unionized employees concentration risk \| Air Line Pilots Association, International (ALPA)
Loss Contingencies [Line Items]
Concentration of risk (greater than)									26.00%
Number of employees, total \| Unionized employees concentration risk \| Association of Flight Attendants ("AFA-CWA")
Loss Contingencies [Line Items]
Concentration of risk (greater than)									41.00%
Number of employees, total \| Unionized employees concentration risk \| Professional Airline Flight Control Association ("PAFCA")
Loss Contingencies [Line Items]
Concentration of risk (greater than)									1.00%
Number of employees, total \| Unionized employees concentration risk \| International Association of Machinists and Aerospace Workers ("IAMAW")
Loss Contingencies [Line Items]
Concentration of risk (greater than)									4.00%
Number of employees, total \| Unionized employees concentration risk \| Transport Workers Union of America ("TWU")
Loss Contingencies [Line Items]
Concentration of risk (greater than)									3.00%
Number of employees, total \| Unionized employees concentration risk \| Aircraft Mechanics Fraternal Association ("AMFA")
Loss Contingencies [Line Items]
Concentration of risk (greater than)									6.00%