Source is in Air India in charge of international planning.
The biggest airport in the world in terms of land mass is the King Khalid International Airport in Riyadh, Saudi Arabia. It takes up some 81 square miles. Second biggest is Denver International, at 53 square miles. London Heathrow is 4.7 square miles. Busiest airport in the world, he says depends on the numbers of take-offs and landings, or passenger numbers. In that case, Atlanta Hartsfield Jackson is the busiest airport in the world, handling 76.7 million passengers. Busiest international airport is London Heathrow handles the most international passengers (but not domestic). Overall Heathrow is third, behind Atlanta and Chicago. Busiest city, i.e of all airports in the world, is London.
Has also given passenger numbers for top 10 airports: Atlanta 76,876,128; Chicago 66,565,952; London Heathrow 63,338,641; Tokyo 61,079,478; Los Angeles 56,223,843; Dallas/Ft Worth 52,828,573; Frankfurt 48,450,357; Paris 48,350,172; Amsterdam 40,736,009 and Denver 35,651,098
Here is something interesting on biggest airports...
O'Hare passes Atlanta as busiest airport
By TARA BURGHART, Associated Press Writer Mon Jul 3, 9:28 PM ET
CHICAGO - O'Hare International Airport was the nation's busiest airport in terms of air traffic during the first half of 2006, surpassing Atlanta's, according to government statistics released Monday.