Transportation in Seoul 2005 AETRA passenger survey, jointly administered by the IATA and Airports Council International, voted it the best airport in the world. It was named by Skytrax as the world's 5th best airport for 2006. Incheon and Gimpo are linked to Seoul by highways, and Gimpo is also linked by subway (line #5). The Incheon International Airport Railroad airport express (or AREX, and styled as A'REX) station is located in the Transport Centre adjacent to the main terminal building and provides high-speed services to Gimpo Airport and Seoul station. There are four types of buses: Seoul has many big intercity/express bus
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