How low (high) do US military jets fly over professional and collegiate sports events?

The Air Force defines a flyover as "one straight and level pass of one to four aircraft of the same type from the same military service and not involving aerobatics or aircraft demonstrations" [source: U.S. Air Force]. Sometimes the aircraft may turn around and execute another pass. The planes maintain an altitude of at least 1,000 feet (305 meters), a rule instituted after Sept. 11.