In September 1991, Delta Air Lines announced that a people mover system would be installed to connect their terminals as part of a major expansion undertaken in the early to mid 1990s. The system was originally announced as consisting of a pair of passenger trains, consisting of three cars seating a maximum of 71 passengers apiece for a total of 213 passengers per train. Constructed and installed by Otis, at the time of its construction this $16.7 million facility was only the sixth of its kind installed by Otis throughout the world. The train would be inaugurated on following a dedication ceremony on June 9, 1994. In 2010, after Delta cut back on flights, the train skipped Concourse A station, and went between Terminal 3 (now the Main Terminal) and Concourse B. Since the closing of Terminal 2, the train makes 3 stops: Main Terminal, Concourse A and Concourse B round-trip. Today, the train handles up to 500 round trips. Trains departs every 90 seconds.