Washington Dulles International Airport passengers. Dulles was once assigned the airport code DIA, with each letter corresponding to the initials of Dulles International Airport. However, when handwritten, it was often misread as DCA, the code for nearby Ronald Reagan Washington National Airport. It was later revised to IAD to avoid confusion. The airport's terminal complex consists of a main terminal and two midfield terminal buildings: Concourses A/B and C/D. The entire terminal complex has 123 gates and 16 hardstand locations from which passengers can board or disembark using the airport's plane mate vehicles. Conceived in early planning sessions in 1959, Dulles is one of
Allen Dulles & Cromwell. His older brother, John Foster Dulles, was the Secretary of State during the Eisenhower Administration. Dulles was born on April 7, 1893, in Watertown, New York, one of five children of Presbyterian minister Allen Macy Dulles, and his wife, Edith F. (Foster). He was five years younger than his brother John Foster Dulles, Dwight D. Eisenhower's Secretary of State and chairman and senior partner of Sullivan & Cromwell, and two years older than his sister, diplomat Eleanor Lansing Dulles. His maternal grandfather, John W. Foster, was Secretary of State under Benjamin Harrison, while his uncle by marriage, Robert