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 son John W. F. Dulles (1913–2008) was a professor of history and specialist in Brazil at the University of Texas at Austin. Their daughter Lillias Dulles Hinshaw (1914–1987) became a Presbyterian minister. Their son Avery Dulles (1918–2008) converted to Roman Catholicism, entered the Jesuit order, and became the first American theologian to be appointed a Cardinal. Upon graduating from law school and passing the bar examination, Dulles joined the New York City law firm of Sullivan & Cromwell, where he specialized in international law. After the start of World War I, Dulles tried to join the United States Army, but