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?
Context: The SMF Automated People Mover is an elevated automated people mover system at Sacramento International Airport in Sacramento, California.  The system opened on October 6, 2011, and is used to move passengers between Central Terminal B (landside) and Concourse B (airside).  The system uses two Bombardier Innovia APM 100 vehicles operating as single cars on two separate parallel tracks. The MIA Mover is an automated people mover (APM) system which opened at the Miami International Airport (MIA) in metropolitan Miami, Florida, United States on September 9, 2011.  The MIA Mover is designed to quickly transport landside passengers between Miami International Airport's Main Terminal and the Miami Central Station and Rental Car Center, as part of the Miami Intermodal Center (MIC).  The MIA Mover is one of three separate automated people movers operating at the airport.  The others are the Skytrain (which operates within Concourse D), and the people mover connecting Concourse E's satellite building. Zhujiang New Town Automated People Mover System (), or APM Line, is an automated people mover (APM) system mainly serving the Zhujiang New Town area in Guangzhou, the new CBD of the city.  It is an underground and automatic operating system.  In terms of construction cost per kilometre, it is the most expensive people mover system in the world, yet it is the shortest and least used line in the Guangzhou Metro network.  The whole line began service before the Asian Games on 8 November 2010 with the exception of Haixinsha Station and Canton Tower Station.  This was due to the two stations being located close to the opening and closing ceremony venue. The Satellite Transit System (STS) is an automated people mover (APM) system operating in the Seattle–Tacoma International Airport.  Originally opening in 1969, the STS system is the oldest airport people mover system in the United States.  The APM was designed to quickly transport passengers between SeaTac Airport's Main Terminal and the North and South Satellites. The Airport Transit System (ATS) is an automated people mover system at Chicago O'Hare International Airport.  The 2.7 mi system was built by Matra at a cost of $127 million, and began its operation on May 6, 1993.  It can accommodate up to 2,400 passengers per hour. The Tampa International Airport People Movers are a set of four separate automatic people mover systems operating within Tampa International Airport.  The people mover systems connect the airport’s main terminal to four satellite airside concourses.  The system was the world’s first automated people mover built within an airport.  A fifth people mover system, known as SkyConnect, is also being installed to connect the main terminal with the airport’s consolidated rental car center. The Skytrain is an airside automated people mover system operating at Miami International Airport.  It operates within the airport's Concourse D, which is a major international hub for American Airlines.  The system, which opened in 2010 as part of an expansion of Concourse D, can transport passengers from end to end of the mile long concourse in five minutes.  The Skytrain is one of three separate automated people movers operating at the airport.  The others are the MIA Mover which connects to the Miami Intermodal Center, and the people mover connecting Concourse E's satellite building. The Pittsburgh International Airport People Mover is a fully automated people mover system at the Pittsburgh International Airport serving Pittsburgh, Pennsylvania.  Designed and installed at a cost of $14 million by Adtranz (now Bombardier), it runs in two parallel underground tunnels to connect the landside terminal with the airside terminal. Mécanique Aviation Traction or Matra ("M"écanique "A"viation "TRA"ction) was a French company covering a wide range of activities mainly related to automobiles, bicycles, aeronautics and weaponry.  In 1994, it became a subsidiary of the Lagardère Group and now operates under that name. 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.  Operating on a 1890 ft concrete guideway, the trams serve to connect the Huntsville Hospital with the Huntsville Hospital for Women & Children.  At the time of completion, this was the second hospital people mover system in the United States after the Duke University Medical Center Patient Rapid Transit.  s of 2010 , this is the only automated people mover system completed in the state of Alabama.
Answer: May 6, 1993