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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Lessee, Operating Lease, Liability, Maturity [Table Text Block] As of December 31, 2021, the maturities of operating lease liabilities are as follows (in thousands):
Operating Leases
2022$20,024 
202317,382 
202413,880 
202510,126 
20264,478 
2027 and beyond42 
Total undiscounted cash payments65,932 
Less: amount representing interest(2,762)
Present value of future minimum lease payments63,170 
Less: current obligations under leases18,783 
Long-term lease obligation$44,387 
Schedules of Concentration of Risk, by Risk Factor
As of December 31, 2021, the flight crewmember employees of ABX, ATI and Omni and flight attendant employees of ATI and Omni were represented by the labor unions listed below:
AirlineLabor Agreement UnitPercentage of
the Company’s
Employees
ABXInternational Brotherhood of Teamsters5.2%
ATIAir Line Pilots Association9.3%
OAIInternational Brotherhood of Teamsters6.1%
ATIAssociation of Flight Attendants0.6%
OAIAssociation of Flight Attendants6.2%