Question: The Airport Transit System (ATS) is an automated people mover system at Chicago O'Hare International Airport that was built by Mécanique Aviation Traction and began its operation when?
Sentence (from "Huntsville Hospital Tram System"): The Huntsville Hospital Tram System is an automated people mover system located as part of the Huntsville Hospital System complex in Huntsville, Alabama, United States.
Relevant evidence: No