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The world's busiest city airport systems by passenger traffic are measured by total number of passengers from all airports within a city or metropolitan area combined. London, with six commercial airports serving its metropolitan area, is the busiest city airport system in the world,[1] although Hartsfield–Jackson Atlanta International Airport is the world's busiest individual airport.
London: Our capital's collective airport system is the busiest in the whole world. A total of 170,980,680 passengers.