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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Lessee, Operating Lease, Liability, Maturity [Table Text Block] As of March 31, 2021, the maturities of operating lease liabilities are as follows (in thousands):
Operating Leases
Remaining 2021$14,309 
202215,104 
202313,801 
202412,489 
20258,726 
2026 and beyond3,349 
Total undiscounted cash payments67,778 
Less: amount representing interest(3,680)
Present value of future minimum lease payments64,098 
Less: current obligations under leases16,781 
Long-term lease obligation$47,317 
Schedules of Concentration of Risk, by Risk Factor
As of March 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 Teamsters4.6%
ATIAir Line Pilots Association9.2%
OAIInternational Brotherhood of Teamsters6.6%
ATIAssociation of Flight Attendants0.7%
OAIAssociation of Flight Attendants6.5%