Who has rated the airport Incheon Subway Line 1 connects to as the best airport worldwide since 2005?
Incheon Subway Line 1:  The line is also included as a part of the overall Seoul Metropolitan Subway network; Bupyeong Station has a free transfer with Seoul Subway Line 1, Gyeyang Station connects with the AREX Line which leads to Incheon International Airport and Seoul Station, Bupyeong-gu Office Station has a free transfer with Seoul Subway Line 7, and Woninjae Station has a free transfer with the Suin Line. Incheon International Airport:  Since 2005, it has been rated the best airport worldwide by Airports Council International every year.
i don't know