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
Avery Dulles and Janet Pomeroy Avery Dulles. His uncle was Director of Central Intelligence Allen Welsh Dulles. Both his great-grandfather John W. Foster and great-uncle Robert Lansing also served as U.S. Secretary of State. His paternal grandfather, Allen Macy Dulles, was a member of the faculty of Auburn Theological Seminary and published in the field of ecclesiology, to which the Catholic Dulles would likewise devote scholarly attention. He received his primary school education in New York City at the St. Bernard's School and attended secondary schools in Switzerland and The Choate School (now Choate Rosemary Hall) in Wallingford, Connecticut. He then enrolled