South Korea's Incheon International Airport, the country's main gateway, was named the world's best airport for the ninth consecutive year, the transportation ministry said Wednesday. The South Korean airport scored the highest among some 1,700 members of the Airports Council International in its annual airport service quality (ASQ) survey, according to the Ministry of Land, Infrastructure and Transport. It was followed by Singapore's Changi Airport and China's Beijing Capital International Airport, in that order.