Gimpo International Airport, formerly rendered in English as Kimpo International Airport, is located in the far western end of Seoul, some 15 km (9 mi) west of the Central District of Seoul. Gimpo was the main international airport for Seoul and South Korea before being replaced by Incheon International Airport in 2001. It now functions as Seoul's secondary airport. In 2015, over 23 million passengers used the airport, making it the third-largest airport in Korea, as it has been surpassed by Jeju International Airport.