Airport Transit System

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The Airport Transit System (ATS) is a convenient, fast and reliable people mover system at O'Hare International Airport, offering fully-automated service every three minutes, 24 hours a day, seven days a week.

The system transports passengers to and from Terminals 1, 2, 3 and 5, as well as the Multi-Modal Facility (MMF) for rental cars, Economy Parking Lot F, Kiss 'n' Fly, Pace buses and Metra.

The ATS reopened to passengers in November 2021, with several major upgrades, such as:

  • a larger fleet of train cars that doubles the overall passenger capacity 
  • the track extension and additional station at the Multi-Modal Facility to connect with the rental car agencies and the economy parking
  • an upgraded automatic train control system 

By the numbers: 

  • 50 mph = top speed of the train system 
  • 10 minutes = time it takes to travel from one end (T1) to the other (MMF) 
  • 5 stations = stations served at T1, T2, T3, T5 and the new one at the MMF 
  • 3 miles = length of track, which is a dual-lane guideway 
  • 36 cars = size of the new train fleet, replacing the previous 15
  • 147 passengers = capacity of each three-car train vehicle 

The ATS has gone through extensive and rigorous testing to ensure safe, reliable and efficient operations for our passengers and employees. Round-the-clock service began on April 2022.​



Terminal Map

Terminal Map

Airline List

Airline List

Passenger Services / Special Numbers​

Passenger Services / Special Numbers


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