No. The operator of Heathrow, BAA, claims that Heathrow is the "world's busiest international airport", but Heathrow is only the world's third-busiest airport by total passenger traffic, after Atlanta-Hartsfield-Jackson and Chicago O'Hare, which are also international airports. However, Heathrow has the highest number of passengers bound for international destinations.

Hartsfield Jackson International in Atlanta is the world's busiest.

Hartsfield-Jackson Atlanta International Airport has been the world's busiest passenger airport since 1998.

CONNECTICUT DOES NOT HAVE ANY AIRPORTS

Connecticut does not have any airports

Gary Kauvar has written:

'Safer skies' -- subject(s): Airline passenger security screening, Airports, Commercial Aeronautics, Passenger traffic, Security measures