It's probably no surprise to anyone who has flown through Atlanta that the city's airport is still the busiest passenger airport in the world.
CNN: And the world’s busiest airport is …

Hartsfield-Jackson (Atlanta International Airport) is the world's busiest airport, serving more than 95 million passengers annually with nonstop service to 160 U.S. destinations and nearly 70 international destinations in more than 45 countries.