Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedules of Concentration of Risk, by Risk Factor

As of September 30, 2017, the flight crewmember employees of ABX and ATI were represented by the labor unions listed below:

Airline	Labor Agreement Unit	Percentage of the Company’s Employees
ABX	International Brotherhood of Teamsters	8.9%
ATI	Air Line Pilots Association	7.7%