Answer: Atlanta
Notes: Hartsfield–Jackson Atlanta International Airport in Georgia, United States is the busiest airport in the world. In 2021, the Hartsfield–Jackson Atlanta International Airport served around 76 million passengers. It has retained the top position as the world's busiest airport by passenger traffic for over 22 consecutive years. In comparison, the next busiest airport is Dallas/Fort Worth International Airport in the USA which served around 62.5 million passengers in 2021. Dubai International Airport that ranked #3 had 29.1 million passengers in 2021.
