3.2bn passengers went through the world's top 100 airports in 2011, 998m of them in Europe and another 989m in North America. The world's very biggest airports have seen big increases in passengers: Heathrow is up 5.1%, Atlanta (the world's biggest) is up 3.3% and Beijing is up 4.5%. The biggest increases came in the new global powerhouses: New Delhi (up 17.8% to 34.7m passengers), Rio (up 17%) up Xiamen in China (up 15.9%).