Which are the world’s top five busiest airports? You may be surprised to learn that it can be any of up to eleven different airports depending on what you call ‘busiest’. There are measures of busyness by passenger number, including or excluding transit passengers, enplanements; i.e. how many people got on a plane from that airport, or busiest in terms of number of aircraft that arrived or departed from the airport. Finally, you can take into account the amount of cargo that passed through an airport in your search for the busiest airports.