1. Atlanta [ATL], Hartsfield-Jackson Atlanta 2. Chicago [ORD], O Hare3. Los Angeles [LAX], Los Angeles4. Dallas [DFW], Dallas/Fort Worth5. Denver [DEN], Denver 6. New York [JFK], John F. Kennedy7. Las Vegas [LAS], McCarran8. Houston [IAH], George Bush Intercontinental Airport9. Phoenix [PHX], Phoenix Sky Harbor10. Orlando [MCO], OrlandoThose are the top 10 as far as passenger numbers are concerned in the USA in that particular order. I know LAX is enormous in size and so is Ohare and JFK is also a huge airport. I haven t been to any of the other airports so not sure the actual size of them. Denver International Airport is 137.25 km2 with six runways so that is pretty huge as well.
Chicago O Hare, New York JFK, Atlanta (don t know what it s called), LAX