Northern Virginia from the older National Airport (a focus city for American Airlines) are restricted for distance, frequency, and flight paths due to the proximity to federal facilities, Dulles is the region's second busiest airport in both passenger loadings and aircraft movements, and the sixteenth-busiest airport in the United States by takeoffs and landings in 2007. Dulles is the region's primary international gateway, serves as a hub for United Airlines, and has recently improved its low-cost carrier offerings with the addition of multiple flights by Southwest and JetBlue. Commuters are served by the Washington Metro subway and the Virginia Railway Express, a
Bălți City Airport used in agriculture, and for public service needs. During the World War II, Bălți City was the most important airport within the surrounding region. The airport has an unpaved runway of unknown proportions. Bălți City Airport Bălți City Airport (""Aeroportul Bălți-Oraș"" in Romanian, ""Аэропорт Бельцы-Город"" in Russian) is one of two airports in Bălți, Moldova. Contrary to the Bălți Airport, which occasionally operates international flights, Bălți City is a regional airport. Bălți City airport is located in the very city of Bălți, at its Eastern fringe (district "Autogara"). This airport is easily and quickly reachable with the trolleybus line 1,