ATS stations are fully accessible and provide access to the elevated ATS tracks. The system has two tracks, and each train stops at all five stations traveling in both directions. Its west end is at Terminal 1, at the west end of the terminal core, and it makes a counterclockwise loop around the parking garage with stops at Terminal 2 and Terminal 3. Parking Garage A (the main garage) is accessible from any of the three terminal stations, as is the O'Hare terminal of the CTA's Blue Line. Parking Lots B and C are only accessible from Terminal 1 and 3 stations, respectively. It takes 10 minutes to travel from Terminal 1 to the consolidated rental car facility.
Outside the terminal loop, the ATS travels east to Terminal 5, the airport's international terminal. It then turns north, crosses over the main access road and Blue Line, and crosses Mannheim Road to reach the consolidated rental car facility, which is the terminal for Pace bus routes 250, 330, and the Pulse Dempster Line. The facility also connects with the O'Hare Transfer station on Metra's North Central Service, providing commuter rail service to Chicago Union Station inbound and Antioch outbound during service hours. Currently, the Metra station is open on weekdays only.