When you enter the TSA line, whatever airport you're in instantly feels like the busiest in the world. But the truth is it's not. Unless you're in Atlanta. Then you're actually dead-on.
For the 21st year in a row, Hartsfield-Jackson Atlanta International Airport has been crowned the busiest in the world on Airports Council International's preliminary world traffic ranking. Over 107 million passengers flew through it last year, and its traffic went up 3.3%. That was on trend, as global passenger traffic rose 6%, and passenger traffic at the 20 busiest airports in the world rose by almost 5%.
Atlanta has such dominance in this space in part because, as CNN points out, it's within a two-hour flight of 80% of the US population and is in an ideal spot as both a connecting hub and a port of entry into North America.
But here's the full list of 20.