Which airport is the busiest in the world by passenger traffic?

Hartsfield-Jackson Atlanta International Airport in the United States is widely known as one of the busiest airports in the world and has repeatedly ranked first for total passenger traffic. In recent years, it has handled well over 100 million passengers annually in strong travel periods, though rankings can shift year by year. Atlanta’s airport benefits from its role as a major connecting hub. Busy airports are measured in different ways, including passengers, aircraft movements, and cargo, so the 'busiest' label can vary by metric. For passenger volume, Atlanta is the classic record holder.