What is the busy airport in the world?

Atlanta Hartsfield Jackson Intl. is the busiest airport in the world, handling 76.7 million passengers in 2002, however London Heathrow(LHR) handled more international flights.

when all the airports in a city are combined, London by far handles the most passengers than any other city, with 20 million per year!

Newark airport and JFK combined do not handle as many passengers as LHR alone per year.