World's busiest city airport systems by passenger traffic

In today’s Geo Quiz we asked what the five busiest airports are. When it comes to international traffic, the most bustling are: Number 5: Hong Kong, Number 4: Frankfurt, Number 3: Amsterdam, Number 2: the Charles de Gaulle airport in Paris…And the number one busiest airport, it serves 62 million passengers a year, is London’s Heathrow Airport.