Photographs: Atlantacitizen/Wikimedia Commons.
The world's busiest airports by passenger traffic are measured by total passengers - those have enplaned and passengers deplaned plus direct-transit passengers.
Hartsfield-Jackson International Airport in Atlanta has been the world's busiest airport every year since 2000.
London has the world's busiest city airport system by passenger count.
Hartsfield-Jackson Atlanta International Airport
Rank: 1
Passengers: 55,868,147
Place: Atlanta, United States
Data from Airports Council International's (January to July 2012)
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World's 30 busiest airports
Photographs: Wikimedia Commons.
Beijing Capital International Airport
Rank: 2
Passengers: 46,950,904
Place: Chaoyang, Beijing, China
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World's 30 busiest airports
Photographs: Warren Rohner/Wikimedia Commons.
London Heathrow Airport
Rank: 3
Passengers: 40,194,949
Place: Hillingdon, London, United Kingdom
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World's 30 busiest airports
Photographs: Flapane/Wikimedia Commons.
O'Hare International Airport
Rank: 4
Passengers: 39,070,976
Place: Chicago, Illinois, United States
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World's 30 busiest airports
Photographs: Adkdhc8/Wikimedia Commons.
Tokyo International Airport
Rank: 5
Passengers: 37,142,196
Place: Ota, Tokyo, Japan
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World's 30 busiest airports
Photographs: Wikimedia Commons.
Los Angeles International Airport
Rank: 6
Passengers: 37,129,716
Place: Los Angeles, California, United States
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World's 30 busiest airports
Photographs: Greenski/Wikimedia Commons.
Paris Charles de Gaulle Airport
Rank: 7
Passengers: 35,746,812
Place: Roissy-en-France, Ile-de-France, France
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World's 30 busiest airports
Photographs: Wikimedia Commons.
Dallas Fort Worth International Airport
Rank: 8
Passengers: 34,175,500
Place: Dallas/Fort Worth, Texas, United States
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World's 30 busiest airports
Photographs: Rainer Ebert/Wikimedia Commons.
Frankfurt Airport
Rank: 9
Passengers: 33,187,170
Place: Frankfurt, Hesse, Germany
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World's 30 busiest airports
Soekarno-Hatta International Airport
Rank: 10
Passengers: 33,095,953
Place: Cengkareng, Tangerang, Banten, Indonesia
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World's 30 busiest airports
Dubai International Airport
Rank:11
Passengers: 32,937,794
Place: Al Garhoud, Dubai, United Arab Emirates
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World's 30 busiest airports
Photographs: Oldie/Wikimedia Commons.
Hong Kong International Airport
Rank:12
Passengers: 32,499,000
Place: Chek Lap Kok, Hong Kong, China
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World's 30 busiest airports
Photographs: Roger Price/ Wikimedia Commons.
Suvarnabhumi Airport
Rank: 13
Passengers: 31,832,953
Place: Bang Phli, Samut Prakan, Thailand
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World's 30 busiest airports
Photographs: David Benbennick/Wikimedia Commons.
Denver International Airport
Rank: 14
Passengers: 30,708,336
Place: Denver, Colorado, United States
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World's 30 busiest airports
Photographs: Eternal dragon/ Wikimedia Commons.
Singapore Changi Airport
Rank: 15
Passengers: 29,352,363
Place: Changi, East Region, Singapore
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World's 30 busiest airports
Photographs: Cjh1452000/Wikimedia Commons.
Amsterdam Schiphol Airport
Rank: 16
Passengers: 29,197,803
Place: Haarlemmermeer, North Holland, Netherlands
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World's 30 busiest airports
Photographs: Doug Letterman/Wikimedia Commons.
John F. Kennedy International Airport
Rank: 17
Passengers: 28,560,886
Place: Queens, New York City, New York, United States
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World's 30 busiest airports
Photographs: JKT-c/Wikimedia Commons.
Guangzhou Baiyun International Airport
Rank: 18
Passengers: 28,008,954
Place: Huadu, Guangzhou, Guangdong, China
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World's 30 busiest airports
Madrid Barajas Airport
Rank: 19
Passengers: 26,699,485
Place: Madrid, Spain
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World's 30 busiest airports
Shanghai Pudong International Airport
Rank: 20
Passengers: 26,126,590
Place: Pudong, Shanghai, China
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World's 30 busiest airports
Photographs: Wikimedia Commons.
San Francisco International Airport
Hakan Dahlstrom/Wikimedia Commons
Rank: 21
Passengers: 25,457,374
Place: San Mateo County, California, United States
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World's 30 busiest airports
Photographs: Nevit Dilmen/Wikimedia Commons.
Ataturk International Airport
Rank: 22
Passengers: 24,842,467
Place: Istanbul, Turkey
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World's 30 busiest airports
Photographs: Mike Russell/Wikimedia Commons
McCarran International Airport
Rank: 23
Passengers: 24,416,354
Place: Las Vegas, Nevada, United States
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World's 30 busiest airports
Photographs: Cygnusloop99/Wikimedia Commons.
Phoenix Sky Harbor International Airport
Rank: 24
Passengers: 24,027,003
Place: Phoenix, Arizona, United States
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World's 30 busiest airports
Photographs: MaverickHunter40245/Wikimedia Commons.
Charlotte Douglas International Airport
Rank: 25
Passengers: 23,996,469
Place: Charlotte, North Carolina, United States
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World's 30 busiest airports
Photographs: WhisperToMe/Wikimedia Commons.
George Bush Intercontinental Airport
Rank: 26
Passengers: 23,834,025
Place: Houston, Texas, United States
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World's 30 busiest airports
Photographs: Patriarca12/Wikimedia Commons.
Miami International Airport
Rank: 27
Passengers: 23,773,269
Place: Miami-Dade County, Florida, United States
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World's 30 busiest airports
Photographs: Jannisri/Wikimedia Commons.
Kuala Lumpur International Airport
Rank: 28
Passengers: 22,624,718
Place: Sepang, Selangor, Malaysia
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World's 30 busiest airports
Seoul Incheon International Airport
Rank: 29
Passengers: 22,196,307
Place: Incheon, Republic of Korea
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World's 30 busiest airports
Munich Airport
Rank: 30
Passengers: 22,132,657
Place: Munich, Bavaria, Germany
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