Who has rated the airport Incheon Subway Line 1 connects to as the best airport worldwide since 2005?
Incheon International Airport: Incheon International Airport (IIA) (IATA: ICN, ICAO: RKSI) (sometimes referred to as Seoul–Incheon International Airport) is the largest airport in South Korea, the primary airport serving the Seoul Capital Area, and one of the largest and busiest airports in the world. Incheon International Airport:  Since 2005, it has been rated the best airport worldwide by Airports Council International every year.
i don't know