Incheon International Airport Air Terminal in Gangnam is linked with the airport through limousine buses. The Airport Railroad Express (AREX and styled as A'REX) has a station located in the Transport Centre adjacent to the Terminal 1 building and is in the basement of Terminal 2. It provides service to Gimpo International Airport and Seoul. Many of the stations along the line provide connections to Incheon Subway, Seoul Metropolitan Subway, and Incheon Airport Maglev. For departing passengers, Seoul Station City Airport Terminal has check-in and immigration facilities before arrival at the airport. The Korea Train eXpress (KTX) operated at the same station as
Incheon International Airport 19th in the world and eighth in Asia by passenger traffic. In 2016, the airport served a total of 57,849,814 passengers. The airport opened for business in early 2001 to replace the older Gimpo International Airport, which now serves mostly domestic destinations plus shuttle flights to alternate airports in China, Japan, and Taiwan. The airport was originally planned to be built in three phases, incrementally increasing airport capacity as the demand grew. This was changed, however, to four phases after the airport was opened. In Phase 1, the airport had a capacity of 30 million passengers annually, and a cargo