Washington's Ronald Reagan National Airport (DCA) ...

Washington's Ronald Reagan National Airport (DCA) is one of the three largest airports serving the Baltimore-Washington metro area in the District of Columbia, and the closest airport to the country's capital. It is located just five kilometers from the downtown district. A total of 11 airlines operate with DCA, including US Airways (using DCA as a hub), Air Canada Express, American Airlines, Delta Air Lines, JetBlue Airways, Southwest Airlines and United Airlines. By law, flights between Washington National Airport and other destinations can only be carried out within a radius of 2011 kilometers from the DCA. However, a total of 20 sorties daily can be performed outside this perimeter.