This B-17 Flying Fortress was part of the ground display at this particular air show.
Air show photography tip: Don't forget the ground displays. But with 100,000 people attending this air show, avoiding spectators in the pictures is challenging. As I was framing shots of this plane, a small kid reached up and put his finger into one of the gun barrels. Unfortunately, I was not quick enough with the shutter.
Shooting over the bystander's heads with telephoto focal lengths is one technique for shooting the ground displays. Add a little motion blur to the prop and it would look like the plane was in the air.