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
London City Airport is served by London City Airport DLR station, which is an elevated station adjoining the terminal building. The station is on a branch of the Docklands Light Railway, which links the airport to Canary Wharf and the City of London as well as to and stations with interchanges to London Underground, London Overground, TfL Rail, Abellio Greater Anglia, c2c Thameslink and Southeastern High Speed train services. The airport is served by the A1020 road and the A112 road. These give fast links to Canning Town, the City of London and Stratford, as well as connecting to the A13 and the