Dulles International Airport (IAD) is an international airport located in Dulles, Virginia, USA, about 26 miles west of downtown Washington, D.C. It is named after John Foster Dulles, the 52nd Secretary of State under President Dwight D. Eisenhower. The airport is operated by the Metropolitan Washington Airports Authority (MWAA) and serves as the primary international gateway for the Washington, D.C. metropolitan area. It has three main passenger terminals and is known for its unique design featuring a main terminal building connected to the concourses by mobile lounges.