Jeju International Airport () is the second largest airport in South Korea, just behind Incheon Airport in Incheon. It is located in the city of Jeju. The airport opened in 1968. Jeju International Airport serves many mainland destinations in South Korea, as well as international destinations in China, Hong Kong, Japan, Taiwan, Thailand, Malaysia and Singapore. In 2015, 26,237,562 passengers used the airport. It is home to the world's busiest airline route, to Seoul-Gimpo. Due to the large numb…