This is one of ten B-17s that still fly, out of 12,731 that were built during World War Two.
Note the distinctive chin turret (above) that the G model was known for. This was added because German fighter pilots had learned that the best way to kill a B-17 was a head-on attack aimed at taking out the pilots and bombardier.
Above and below, close-up views of the Wright R-1820-97 "Cyclone" turbosupercharged radial engines. These put out 1,200 hp each.
This aircraft could cruise at 182mph and had a range of 2,000 miles, allowing it to take the fight anywhere in Germany.
Now that's a tire (above). Below is the ball turret that protected the belly of the aircraft, and other aircraft when flown in formation.