In the No. 2 spot for passenger counts is Beijing Capital International Airport, with nearly 95.8 million passengers, up 1.5 percent year-over-year. Dubai International Airport came in at No. 3 in passengers, with 88.2 million passengers, up 5.5 percent.
Tokyo Haneda is at No. 4 for passenger counts, Los Angeles International at No. 5 and Chicago O’Hare at No. 6.
The ranking comes as Atlanta-headquartered airline Delta ranked No. 2 in Wichita State University and Embry-Riddle Aeronautical University's Airline Quality Rating research.
Atlanta is among the airports that had a decline in total flights in 2017, while it remains the world’s busiest for flight counts.
“Though there has been weaker growth in aircraft movements especially in certain North American and European markets following the Great Recession, this is consistent with the move toward consolidated operations and a curbing of capacity by aircraft operators to increase aircraft load factors and improve yields,” according to Airports Council International.