You could definitely argue that Heathrow isn't the best airport, but it's clearly the biggest by passenger numbers: http://en.wikipedia.org/wiki/List_of_the_bu

You could definitely argue that Heathrow isn't the best airport, but it's clearly the biggest by passenger numbers: http://en.wikipedia.org/wiki/List_of_the_busiest_airports_in_Europe http://en.wikipedia.org/wiki/List_of_the_busiest_airports_in... (CDG might be bigger for non-human traffic)