Transportation in Washington, D.C. via Washington Metro. The airport is conveniently located near to the downtown area; however, it has somewhat restricted flights to airports within the United States because of noise and security concerns. Most major international flights arrive and depart from Washington Dulles International Airport , located west of the city in Fairfax and Loudoun counties in Virginia. Dulles is the second busiest international gateway on the Eastern Seaboard. It is the Washington region's second busiest airport in terms of passengers served. Dulles offers service from several low-cost carriers including JetBlue, although the low-cost selection decreased greatly when Independence Air (which was
Washington Dulles International Airport mezzanine with more room for lines. A new train system, dubbed AeroTrain and developed by Mitsubishi, began in 2010 to transport passengers between the concourses and the main terminal. The system, which uses rubber tires and travels along a fixed underground guideway, is similar to the people mover systems at Singapore Changi Airport, Hartsfield–Jackson Atlanta International Airport, and Denver International Airport. The train is intended to replace the mobile lounges, which many passengers found crowded and inconvenient. The initial phase includes the main terminal station, a permanent Concourse A station, a permanent Concourse B station, a permanent midfield concourse station