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
John Foster Dulles auspices. Dulles wrote: Dulles never lost his anxiety about the destructive power of nuclear weapons, but his views on international control and on employing the threat of atomic attack changed in the face of the Berlin blockade, the Soviet detonation of an A-bomb, and the advent of the Korean war. These convinced him that the communist bloc was pursuing expansionist policies. Governor Dewey appointed Dulles to the United States Senate to replace Democratic incumbent Robert F. Wagner, who had resigned due to ill health. Dulles served from July 7 to November 8, 1949. He lost the 1949 special election to