LONDON - MAY 13: Travelers arrive at Heathrow airport on May 13, 2012 in London, England. Heathrow has been world's busiest airports by international passenger traffic since 2000 (64.7 million in 2011).
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LONDON - MAY 13: Travelers arrive at Heathrow airport on May 13, 2012 in London, England. Heathrow has been world's busiest airports by international passenger traffic since 2000 (64.7 million in 2011).