Original: The Incheon International Airport Railroad connects Incheon International Airport to Gimpo International Airport and Seoul Subway Line 5 and Line 9 which opened March 23, 2007.
Simplified: Incheon International Airport Railroad (A 'REX) and Incheon International Airport Highway were built to increase the accessibility to Seoul. The airport is operated by Incheon International Airport Corporation (IIAC) and it is owned by the government of South Korea.