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
Tri-City Airport (Kansas) Tri-City Airport (Kansas) Tri-City Airport is a city-owned public-use airport located 11 nautical miles (20 km) west of the central business district of Parsons, a city in Labette County, Kansas, United States. In 1942 this was the Cherryvale Army Air Force Auxiliary Field #9 for the Independence Army Airfield. Between 1979 and 1986, PPF was served by Air Midwest operating under Eastern Airlines. The aircraft used was a 19-seat Swearingen Metroliner. Tri-City Airport covers an area of at an elevation of 900 feet (274 m) above mean sea level. It has one runway designated 17/35 with a concrete surface measuring