On March 6, 2004, about 1100 eastern standard time, a Beech V35B, N4010A, registered to and operated by a private individual, as a Title 14 CFR Part 91 training flight, landed gear up on runway 18 at the Stennis International Airport, Bay St. Louis, Mississippi. Visual meteorological conditions prevailed and no flight plan was filed. The private pilot reported no injuries, and the airplane incurred substantial damage. The flight originated from Stennis earlier that day about 0930. The pilot stated while on a practice precision instrument landing, two airplanes flew over the runway's threshold at about 1,000 feet and two helicopters were hovering over the taxiway next to the runway, which distracted his attention and "did not lower the landing gear" before landing. The airplane landed on its belly and skidded to a stop on the runway. The pilot further stated there were "no" mechanical failures or malfunctions to the airplane or any of its systems prior to the accident.