Dulles International Airport, airport, Fairfax and Loudoun cos., NE Va., 24 mi. W of Wash., D.C., 3 mi/4.8 km SW of Herndon, Va.; 38°56'N 77°27'W. Opened on Nov. 19, 1962, it covers more than 16 sq mi/41 sq km and has three runways over 10,000 ft/3,048 m long. In 1995 it handled more than 10 million passengers with 245 daily flights; its 26 scheduled carriers serve 98 destinations. Major cargo hub.