The Airports Council International (ACI) recently released its list of the busiest airports in the world. Once again, Hartsfield-Jackson Atlanta International Airport (ATL) took the top spot, with more than 104 million passengers in 2016. According to the ACI, this represents an increase in traffic of over 2.6% over 2015. The trade group attributes Atlanta's success to its strategic location, where it is within a two-hour flight of 80% of the US population. In addition, the ACI credits the growth of ATL's largest tenant — Delta Air Lines — for the airport's continued expansion. Globally, the number of people traveling by air grew at a rate of 5.6% in 2016.

"The aviation industry is constantly changing, adapting and innovating," said ACI World director general, Angela Gittens, in a statement. "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."

The trade group compiled its list using passenger traffic data from 1,179 airports around the world.

Here are the 20 busiest airports in the world based on total passenger traffic:

No. 20. Bangkok Suvarnabhumi Airport (BKK): 55,892,428 passengers in 2016.

No. 19. Incheon International Airport (ICN): 57,849,814 passengers in 2016

No. 18. Denver International Airport (DEN): 58,266,515 passengers in 2016

No. 17. Singapore Changi Airport (SIN): 58,698,000 passengers in 2016

No. 16. John F. Kennedy International Airport (JFK): 58,873,386 passengers in 2016

No. 15. Guangzhou Baiyun International Airport (CAN): 59,732,147 passengers in 2016

No. 14. Istanbul Ataturk Airport (IST): 60,119,876 passengers in 2016

No. 13. Frankfurt Airport (FRA): 60,786,937 passengers in 2016

No. 12. Amsterdam Airport Schiphol (AMS): 63,625,534 passengers in 2016

No. 11. Dallas/Fort Worth International Airport (DFW): 65,670,697 passengers in 2016

No. 10. Paris Charles de Gaulle Airport (CDG): 65,933,145 passengers in 2016

No. 9. Shanghai Pudong International Airport (PVG): 66,002,414 passengers in 2016

No. 8. Hong Kong International Airport (HKG): 70,305,857 passengers in 2016

No. 7. Heathrow Airport (LHR): 75,715,474 passengers in 2016

No. 6. Chicago O'Hare International Airport (ORD): 77,960,588 passengers in 2016

No. 5. Tokyo International Airport (HND): 79,699,762 passengers in 2016

No. 4. Los Angeles International Airport (LAX): 80,921,527 passengers in 2016

No. 3. Dubai International Airport (DXB): 83,654,250 passengers in 2016

No. 2. Beijing Capital International Airport (PEK): 94,393,454 passengers in 2016

No. 1. Hartsfield-Jackson Atlanta International Airport (ATL): 104,171,935 passengers in 2016