Where I used to live, before I moved, I used to have a B-17 that would fly over about 4 times a year. They would do a show with it at the local airport and they would take and fly over our house with it. It was always very interesting and the cool part is you could hear it coming for quite a distance. I have to say, though, I still love seeing the old bombers flying over.
I remember watching some movies on Netflix years ago about several pilots were forced to use old WWII aircraft to do battle. Although they did modified the aircraft to carry some modem bombs in some cases. They actually pulled it off.
I guess old combat aircraft can still be lethal. Just imagine what a formation of B-17 can do to a city if it is undefended by modern weapons.