Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The future minimum lease payments of the Company as of December 31, 2017 are scheduled below (in thousands):

	Facility Leases		Other Leases
2018	$	11,109	$	433
2019	4,781		312
2020	2,394		179
2021	1,969		—
2022	1,904		—
2023 and beyond	12,019		—
Total minimum lease payments	$	34,176	$	924

Schedules of Concentration of Risk, by Risk Factor

As of December 31, 2017, the flight crewmember employees of ABX and ATI and flight attendant employees of ATI were represented by the labor unions listed below:

Airline	Labor Agreement Unit	Percentage of the Company’s Employees
ABX	International Brotherhood of Teamsters	8.4%
ATI	Air Line Pilots Association	7.6%
ATI	Association of Flight Attendants	1.3%