All international arrivals at O'Hare (excluding flights from destinations with U.S. border preclearance) are processed at Terminal 5, which also handles most non-US carriers and certain domestic low-cost carriers. Terminal 5 has 21 gates on one concourse: Concourse M. It is across the airfield from Terminals 1, 2, and 3 is connected by a tram service. Terminal 5 opened in 1993. There is no Terminal 4 at ORD used for airline services but instead the airport's facility for CTA busses and ground transporation.