Question

which is the world's busiest airport

Answer 1

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Hartsfield–Jackson Atlanta International Airport has been the world's busiest airport every year since 2000; with all airports combined London has the world's busiest city airport system by passenger count.

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Answer 2

Answer:

Hartsfield-Jackson Atlanta International Airport

More than 107 million passengers flew through Hartsfield-Jackson Atlanta International Airport last year, making it the busiest passenger airport in the world for the 21st year in a row.