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http://geography.about.com/od/urbaneconomicgeography/a/busiestairports.htmSince 1998, Hartsfield-Jackson Atlanta International Airport in the United States has been the world's busiest passenger airport. Numbers represent the number of passengers enplaned and deplaned with passengers in transit counted only once.
1. Hartsfield-Jackson Atlanta International Airport - 84,846,639
2. O'Hare International Airport (Chicago) - 77,028,134
3. Heathrow Airport (London) - 67,530,197
4. Haneda Airport (Tokyo) - 65,810,672
5. Los Angeles International Airport - 61,041,066
6. Dallas/Fort Worth International Airport - 60,226,138
7. Paris-Charles de Gaulle Airport - 56,849,567
8. Frankfurt Airport - 52,810,683
9. Beijing Capital International Airport - 48,654,770
10. Denver International Airport - 47,325,016
11. McCarran International Airport (Las Vegas) - 46,193,329
12. Amsterdam Airport Schiphol - 46,065,719
13. Madrid Barajas Airport - 45,501,168
14. Hong Kong International Airport - 43,857,908
15. John F. Kennedy International Airport (New York City) - 43,762,282
16. Bangkok International Airport - 42,799,532
17. George Bush Intercontinental Airport (Houston) - 42,550,432
18. Phoenix Sky Harbor International Airport - 41,436,737
19. Newark Liberty International Airport (New Jersey) - 36,724,167
20. Detroit Metropolitan Wayne County Airport - 35,972,673
21. Minneapolis-St. Paul International Airport - 35,612,133
22. Singapore Changi Airport - 35,033,083
23. Narita International Airport (Tokyo) - 34,975,225
24. Orlando International Airport - 34,640,451
25. London Gatwick Airport - 34,172,492
26. San Francisco International Airport - 33,574,807
27. Miami International Airport - 32,533,974
28. Philadelphia International Airport - 31,768,272
29. Toronto Pearson International Airport - 30,972,577
30. Munich Airport - 30,757,978