Europe 24

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The definition of the world's busiest airport has been specified by the Airports Council International in Geneva, Switzerland. The ACI defines and measures the following three types of airport traffic:

• Passenger traffic: total passengers emplaned and deplaned, passengers in transit counted once
• Cargo traffic: loaded and unloaded freight and mail in metric tonnes
• Traffic movements: landings and take-offs of aircraft

The following airports make claims based on objective volume measures that are defined above:

• Hartsfield–Jackson Atlanta International Airport, Atlanta, Georgia, United States:

Largest number of passengers annually (1998–present); Most aircraft movements annually (1999–2000, 2005–present); In 2007, Hartsfield again set the world's record for most aircraft movements in one year with 994,346.

• Hong Kong International Airport, Hong Kong

Most cargo traffic by weight annually (2010-present).

• Airports of London combined, London, United Kingdom

Largest number of passengers annually in all city airports combined (2010).

• London Heathrow Airport, United Kingdom

Largest number of international passengers annually (2004–present). 'Nuff said: throw in Gatewick for single runway useage and England is three for five overallThe gory details: http://en.wikipedia.org/wiki/World's_busiest_airports_by_passenger_traffic