The Airports Council International (ACI) released its study of the busiest airports in the world, and Atlanta’s Hartsfield-Jackson International Airport is in the top slot. The airport has been on top of the list for the past two years, edging Chicago O’Hare starting in 2015.

Other data show the fastest growing airport in the top 20 is Seoul’s Incheon Airport, which saw a 17.1 percent increase in travelers.

Los Angeles International Airport also saw impressive growth. It’s the fourth-busiest airport in the world after rising 8 percent since last year’s study. Overall traffic at the top 20 airports added up to 1.4 billion passengers.

“Global aviation markets remain dynamic in the face of economic uncertainty and geopolitical risks that persist on many fronts. Connecting people and places still remains paramount to the aviation sector in spite of the looming threat to market liberalization in major Western economies,” said Angela Gittens, director general, ACI World. “We see passenger traffic continuing to grow at many of the major hubs. The combined use of larger aircraft, increased load factors by airlines and more efficient use of infrastructure continue to be an important trend across the industry. From a global perspective, this is a testament to the efficiency gains that have been achieved in the sector.”