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
Dulles District Dulles District The 4A Dulles District is a high school conference in the state of Virginia that includes schools from Northern Virginia, with all of its full-time members from Loudoun County. 4A is the third largest enrollment class of the Virginia High School League and is typically very competitive in Virginia high school sports. The Dulles District schools compete in the 4A West Region with the schools from Conference 21A, Conference 22, Conference 23, and Conference 24. The Dulles District was created in 2001 from all six Loudoun County high schools that were in the AA Northwestern District, which were