As an aside, the sole flying B-17E along with a B-24 Liberator and a P-51D Mustang were at the Chicago Executive Jetport in Wheeling, IL today. My family passed them on our way to lunch. We’d have stopped in to see them later, but by the time we got back the B-17 and P-51 had left and the B-24 was revving its engines for its takeoff roll.