Ronald Reagan Washington National Airport more distant Washington Dulles International Airport. Reagan National has United States immigration and customs facilities only for business jet traffic; the only scheduled international flights allowed to land at the airport are those from airports with U.S. Customs and Border Protection preclearance facilities. Other international passenger flights must use Washington Dulles International Airport or Baltimore–Washington International Airport. The first airport in the Washington area with a major terminal was Arlington's Hoover Field, which opened its doors in 1926. Located near the present site of the Pentagon, the facility's single runway was crossed by a street; guards had to stop automobile
Washington Dulles International Airport mezzanine with more room for lines. A new train system, dubbed AeroTrain and developed by Mitsubishi, began in 2010 to transport passengers between the concourses and the main terminal. The system, which uses rubber tires and travels along a fixed underground guideway, is similar to the people mover systems at Singapore Changi Airport, Hartsfield–Jackson Atlanta International Airport, and Denver International Airport. The train is intended to replace the mobile lounges, which many passengers found crowded and inconvenient. The initial phase includes the main terminal station, a permanent Concourse A station, a permanent Concourse B station, a permanent midfield concourse station