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 two passenger terminals, and one cargo terminal. In 2016, the ten carriers with the largest percentage of passengers flying into, out of, or through Gimpo International Airport are as follows: Korea Airports Corporation (KAC) has its headquarters on the airport property. The Aviation and Railway Accident Investigation Board (ARAIB) has its FDR/CVR Analysis and Wreckage Laboratory on the property of the airport. When the predecessor agency Korea Aviation Accident Investigation Board (KAIB) existed, its CVR/FDR and wreckage laboratory was located on the airport property. On 23 March 2007 the AREX airport express line started operations to Incheon International Airport, with