What city has the busiest airport in the world?

The city with the busiest airport in the world is Atlanta, Georgia, USA. Hartsfield-Jackson Atlanta International Airport is not only the busiest airport in terms of total passenger traffic but also handles the highest number of aircraft movements. This airport serves as a major hub for several airlines and is strategically located, making it a popular connecting point for domestic and international flights. Additionally, Atlanta's airport has undergone significant expansions and improvements over the years to accommodate the growing number of passengers, further cementing its position as the busiest airport in the world.