Other airports are the world’s busiest by different measures. Chicago O’Hare had the most flights with 903,747 to Atlanta’s 895,682.
It's not the first time in recent years that O'Hare has been No. 1 in flight counts -- Chicago also bested Atlanta by that measure in 2014.
In 2018, Airports Council International rankings also show that Dubai International Airport had the most international passengers, while Hong Kong International Airport handled the most cargo traffic.