AirTrain is a fully automated people mover at San Francisco International Airport (SFO) that opened on February 24, 2003.

The Red Line travels in a clockwise loop around the central terminal area, which takes about nine minutes to complete.

The Blue Line travels in a counterclockwise loop, serving the same stations in reverse order, and also proceeding to West Field Road, the Rental Car Center, and long-term parking, which takes 25 minutes for a round trip.

The APM 100 cars can also be found at airports in Tampa, Denver, Atlanta, Seattle-Tacoma, Houston, and Madrid.

[8]A $15 million infill station was constructed to serve the Grand Hyatt at SFO, a new airport hotel.