Seoul, South Korea

ACI ranking: No. 1 worldwide

Incheon International Airport is South Korea's largest airport, serving as the main gateway to Seoul. The airport has been rated as the top performing airport in the world for the fourth consecutive year, thanks partly to the government's campaign to make it an aviation hub in Northeast Asia. Last summer, for example, it launched a new lounge for transit passengers offering free facilities for shower, Internet, and giant screens for movies.