Concourse C also has a dedicated Federal Inspection Station located at ground level. International United flights not originating at an airport with US customs pre-clearance can directly deplane passengers via the jet bridge at Concourse C (as opposed to using plane mates to offload passengers). Once deplaned, arriving passengers are separated. Passengers terminating at Dulles take a mobile lounge that transports them to the International Arrivals Building, while connecting passengers continuing on another United flight go through U.S. Customs and Immigration at the FIS station on the ground level. Since this immigration facility is only for connecting passengers on United and other Star Alliance carriers, it has shorter lines and passengers do not have to re-clear security at the massive security checkpoints in the main terminal.