LA/Ontario International Airport provides courtesy shuttle service between the airline terminals, Economy Lot F, Daily Lot 5, and the Ground Transportation Center (GTC). The GTC is the airport’s central facility for connections to all on-airport and off-airport car rental businesses. Shuttle Route Service Hours Departure Frequency Economy Lot F 24 hours Every 10 to 12 minutes Parking Lot 5 24 hours Every 10 to 12 minutes GTC 24 hours Every 5 to 7 minutes All courtesy shuttles are wheelchair accessible. Shuttle departures may occur less frequently from 1 a.m. to 5 a.m. because of reduced airline flight activity.