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
John Foster Dulles son John W. F. Dulles (1913–2008) was a professor of history and specialist in Brazil at the University of Texas at Austin. Their daughter Lillias Dulles Hinshaw (1914–1987) became a Presbyterian minister. Their son Avery Dulles (1918–2008) converted to Roman Catholicism, entered the Jesuit order, and became the first American theologian to be appointed a Cardinal. Upon graduating from law school and passing the bar examination, Dulles joined the New York City law firm of Sullivan & Cromwell, where he specialized in international law. After the start of World War I, Dulles tried to join the United States Army, but