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Commitments, Contingencies and Other Contractual Arrangements - Employees (Details) $ in Millions			2 Months Ended	6 Months Ended
	Nov. 01, 2025 pilot	Oct. 01, 2025 pilot	Mar. 12, 2025 USD ($) pilot employee	Jun. 30, 2025 employeeGroup employee
Concentration Risk [Line Items]
Number of pilots furloughed (approximately)			200
Furlough expenses \| $			$ 0.9
Number of positions eliminated from various departments (approximately) \| employee			200
Expenses related to eliminated positions \| $			$ 1.8
Forecast
Concentration Risk [Line Items]
Number of pilots furloughed (approximately)	270
Number of pilots downgraded during period		140
Aircraft Mechanics Fraternal Association ("AMFA")
Concentration Risk [Line Items]
Number of employees included in union application (approximately) \| employee				558
Unionized Employees Concentration Risk \| Number of Employees, Total
Concentration Risk [Line Items]
Number of union-represented employee groups \| employeeGroup				6
Company's employees covered under collective bargaining agreements percentage				83.00%
Unionized Employees Concentration Risk \| Number of Employees, Total \| Air Line Pilots Association, International ("ALPA") (2)
Concentration Risk [Line Items]
Company's employees covered under collective bargaining agreements percentage				26.00%
Unionized Employees Concentration Risk \| Number of Employees, Total \| Association of Flight Attendants ("AFA-CWA")
Concentration Risk [Line Items]
Company's employees covered under collective bargaining agreements percentage				44.00%
Unionized Employees Concentration Risk \| Number of Employees, Total \| Professional Airline Flight Control Association ("PAFCA")
Concentration Risk [Line Items]
Company's employees covered under collective bargaining agreements percentage				1.00%
Unionized Employees Concentration Risk \| Number of Employees, Total \| International Association of Machinists and Aerospace Workers ("IAMAW")
Concentration Risk [Line Items]
Company's employees covered under collective bargaining agreements percentage				4.00%
Unionized Employees Concentration Risk \| Number of Employees, Total \| Transport Workers Union of America ("TWU")
Concentration Risk [Line Items]
Company's employees covered under collective bargaining agreements percentage				3.00%
Unionized Employees Concentration Risk \| Number of Employees, Total \| Aircraft Mechanics Fraternal Association ("AMFA")
Concentration Risk [Line Items]
Company's employees covered under collective bargaining agreements percentage				5.00%