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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedules of Concentration of Risk, by Risk Factor The table below sets forth the Company's employee groups and status of the collective bargaining agreements as of December 31, 2020. 
Employee Groups  Representative  Amendable DatePercentage of Workforce
Pilots  Air Line Pilots Association, International (ALPA)  February 202329%
Flight Attendants  Association of Flight Attendants (AFA-CWA)  May 202146%
Dispatchers  Professional Airline Flight Control Association (PAFCA)  October 20231%
Ramp Service AgentsInternational Association of Machinists and Aerospace Workers (IAMAW)June 20203%
Passenger Service AgentsTransport Workers Union of America (TWU)NA3%