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
Gimpo International Airport of which the airport used to be a part. On 29 November 2003, scheduled services between Gimpo and Haneda Airport in Tokyo, Japan resumed. Services to Shanghai Hongqiao International Airport resumed on 28 October 2007. Services to Kansai International Airport in Osaka, Japan started on 26 October 2008. Services to Beijing Capital International Airport started on 1 July 2011. Services to Taipei Songshan Airport started on 30 April 2012. The airfield was originally constructed in 1935–1942 during the Japanese Imperial period as an Imperial Army base. The runways were built on a bed of rocks manually hauled by Korean laborers