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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Beijing Capital International Airport

Rank: 2

Passengers: 46,950,904

Place: Chaoyang, Beijing, China

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London Heathrow Airport

Rank: 3

Passengers: 40,194,949

Place: Hillingdon, London, United Kingdom

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O'Hare International Airport

Rank: 4

Passengers: 39,070,976

Place: Chicago, Illinois, United States

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Tokyo International Airport

Rank: 5

Passengers: 37,142,196

Place: Ota, Tokyo, Japan

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Los Angeles International Airport

Rank: 6

Passengers: 37,129,716

Place: Los Angeles, California, United States 

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Paris Charles de Gaulle Airport

Rank: 7

Passengers: 35,746,812

Place: Roissy-en-France, Ile-de-France, France

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Dallas Fort Worth International Airport

Rank: 8

Passengers: 34,175,500

Place: Dallas/Fort Worth, Texas, United States 

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Frankfurt Airport

Rank: 9

Passengers: 33,187,170

Place: Frankfurt, Hesse, Germany

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Soekarno-Hatta International Airport

Rank: 10

Passengers: 33,095,953

Place: Cengkareng, Tangerang, Banten, Indonesia

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Dubai International Airport

Rank:11

Passengers: 32,937,794

Place: Al Garhoud, Dubai, United Arab Emirates

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Hong Kong International Airport

Rank:12

Passengers: 32,499,000

Place: Chek Lap Kok, Hong Kong, China

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Suvarnabhumi Airport

Rank: 13

Passengers: 31,832,953

Place: Bang Phli, Samut Prakan, Thailand 

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Denver International Airport

Rank: 14

Passengers: 30,708,336

Place: Denver, Colorado, United States

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Singapore Changi Airport

Rank: 15

Passengers: 29,352,363

Place: Changi, East Region, Singapore

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Amsterdam Schiphol Airport

Rank: 16

Passengers: 29,197,803

Place: Haarlemmermeer, North Holland, Netherlands 

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John F. Kennedy International Airport

Rank: 17

Passengers: 28,560,886

Place: Queens, New York City, New York, United States 

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Guangzhou Baiyun International Airport

Rank: 18

Passengers: 28,008,954

Place: Huadu, Guangzhou, Guangdong, China

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Madrid Barajas Airport

Rank: 19

Passengers: 26,699,485

Place: Madrid, Spain 

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Shanghai Pudong International Airport

Rank: 20

Passengers: 26,126,590

Place: Pudong, Shanghai, China

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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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Ataturk International Airport

Rank: 22

Passengers: 24,842,467

Place: Istanbul, Turkey

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McCarran International Airport

Rank: 23

Passengers: 24,416,354

Place: Las Vegas, Nevada, United States

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Phoenix Sky Harbor International Airport

Rank: 24

Passengers: 24,027,003

Place: Phoenix, Arizona, United States

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Charlotte Douglas International Airport

Rank: 25

Passengers: 23,996,469

Place: Charlotte, North Carolina, United States 

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George Bush Intercontinental Airport

Rank: 26

Passengers: 23,834,025

Place: Houston, Texas, United States 

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Miami International Airport

Rank: 27

Passengers: 23,773,269

Place: Miami-Dade County, Florida, United States

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Kuala Lumpur International Airport

Rank: 28

Passengers: 22,624,718

Place: Sepang, Selangor, Malaysia 

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Seoul Incheon International Airport

Rank: 29

Passengers: 22,196,307

Place: Incheon, Republic of Korea 

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Munich Airport

Rank: 30

Passengers: 22,132,657

Place: Munich, Bavaria, Germany