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
Mexico City International Airport are United Airlines, American Airlines, Delta Air Lines and Avianca Holdings. Aeroméxico/Aeroméxico Connect operates the most departures from the airport followed by Interjet, Volaris, and Aeromar. Aeroméxico also operates to the most destinations followed by Interjet. This table lists passengers flights served with a nonstop or direct flight with no change of aircraft carrying passengers originating in Mexico City according to the airlines' published schedules, unless otherwise noted. In addition to the scheduled airlines above, Mexico City airport is used by some further airlines for chartered flights including: As of January 2018, Mexico City airport is served by 19 cargo