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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Lessee, Operating Lease, Liability, Maturity [Table Text Block] As of December 31, 2020, the maturities of operating lease liabilities are as follows (in thousands):
Operating Leases
2021$19,460 
202215,183 
202313,941 
202412,637 
20258,691 
2026 and beyond3,348 
Total undiscounted cash payments73,260 
Less: amount representing interest(4,348)
Present value of future minimum lease payments68,912 
Less: current obligations under leases17,784 
Long-term lease obligation$51,128 
Schedules of Concentration of Risk, by Risk Factor
As of December 31, 2020, 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 Teamsters4.4%
ATIAir Line Pilots Association8.2%
OAIInternational Brotherhood of Teamsters6.6%
ATIAssociation of Flight Attendants0.7%
OAIAssociation of Flight Attendants6.9%