I took a trip with our sports car club today. Part of the route was on a road just outside Beale AFB that parallels the base perimeter. We saw 2 U-2 aircraft at a distance, then another one came towards us maybe 1000 feet off the ground and 2000 feet to the side of the road. The woman passenger in our lead car (Corvette convert with top down) waved at the U-2 and got a white light flashed back at her. Then she waved twice and got 2 flashes back. A couple of days ago I heard some lazy sounding old radial engines and went outside to see the rear end of a B-17 that had just passed right over my house at probably under 2,000 feet. Must have been the one flying out of McClellan Airfield that day.