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 Hongqiao Airport in Shanghai starting in October 2007, Kansai Airport in Osaka starting in 2008, Beijing starting in July 2011, and Songshan Airport in Taipei starting in April 2012. Total international passenger numbers at Gimpo rose from under one million in 2005 to over four million by 2012. Korea Airports announced an expansion and remodeling of the terminals in 2013, adding new gates and security checkpoints. In 2017, the Korean government announced that a new terminal would be built to meet growing domestic traffic. Gimpo currently has two runways (3600 m × 45 m & 3200 m × 60 m),