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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Lessee, Operating Lease, Liability, Maturity [Table Text Block] As of September 30, 2021, the maturities of operating lease liabilities are as follows (in thousands):
Operating Leases
Remaining 2021$4,884 
202218,017 
202316,339 
202412,841 
20259,080 
2026 and beyond3,591 
Total undiscounted cash payments64,752 
Less: amount representing interest(2,999)
Present value of future minimum lease payments61,753 
Less: current obligations under leases17,292 
Long-term lease obligation$44,461 
Schedules of Concentration of Risk, by Risk Factor
As of September 30, 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 Teamsters4.8%
ATIAir Line Pilots Association9.2%
OAIInternational Brotherhood of Teamsters6.2%
ATIAssociation of Flight Attendants0.6%
OAIAssociation of Flight Attendants5.8%