The following is a sample listing of five of the world's busiest airports by passenger traffic for Year 1. Name Location # Hartsfield-Jackson Atlanta, Georgia, US Capital International Beijing, China O'Hare Chicago, Illinois, US Heathrow London, United Kingdom Tokyo Tokyo, Japan The percentage of passenger traffic in these busiest airports that occurred outside of the US is the closest to 20.9% 44.2% 79.1%% O 55.8%ng of five of the world's busiest or Year 1. Location # of Passengers (in millions) Atlanta, Georgia, US 89 Beijing, China 74 Chicago, Illinois, US 66 London, United Kingdom 64 Tokyo, Japan 58 traffic in these busiest airports that the closest to 20.9% 44.2% 79.1%% O 55.8%