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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Lessee, Operating Lease, Liability, Maturity [Table Text Block] As of June 30, 2020, the maturities of operating lease liabilities are as follows (in thousands):
Operating Leases
Remaining 2020$8,652  
202114,793  
202210,864  
20239,610  
20248,394  
2025 and beyond7,177  
Total undiscounted cash payments59,490  
Less: amount representing interest(4,506) 
Present value of future minimum lease payments54,984  
Less: current obligations under leases14,902  
Long-term lease obligation$40,082  
Schedules of Concentration of Risk, by Risk Factor
As of June 30, 2020, the flight crewmember employees of ABX, ATI and OAI and flight attendant employees of ATI and OAI were represented by the labor unions listed below:
AirlineLabor Agreement UnitPercentage of
the Company’s
Employees
ABXInternational Brotherhood of Teamsters5.0%
ATIAir Line Pilots Association8.5%
OAIInternational Brotherhood of Teamsters7.4%
ATIAssociation of Flight Attendants0.8%
OAIAssociation of Flight Attendants7.7%