Francois Bergeon, Beechcraft C-45 Expeditor aircraft pilot, checks his fuel level with a dip stick during the 2011 Aviation Nation Open House, Nov. 12, at Nellis Air Force Base, Nev. The C-45 flew in the Heritage Aerial Gunnery/Bomber Demonstration during the two-day air show. Aviation Nation celebrates 70 years of airpower in Las Vegas.