For the week of AirVenture Oshkosh (known locally as "The Airshow" or "The Fly-in"), Wittman Regional is the world's busiest airport by traffic movements.
The airport's control tower is the busiest control tower in the world during the gathering.
Both reference EAA AirVenture takes flight for the future. The Milwaukee Journal Sentinel. July 24, 2004. It only says:
So many planes take off and land, in fact, that tiny Wittman Field is transformed into the world's busiest airport during the convention.
The world's busiest airport by traffic movements during the seven-day EAA AirVenture Oshkosh event. 25,000 traffic movements are handled in a week during the yearly event [...]
It references "EAA Newsletter, Volume 3, Number 36". August 2004, and links here, which is actually EAA Newsletter, Volume 3, Number 36, from August 2003.
The summary of the story reads:
During this year’s EAA AirVenture Oshkosh, some 25,000 takeoffs and landings will be performed at Wittman Field, making this the world’s busiest airport.
Does Wittman Regional Airport's 25,000 takeoffs and landings during EAA AirVenture Oskhosh make it the world's busiest airport and control tower during that period?