The movie aircrews have superhuman powers in that they don't require oxygen masks at 18000 feet and more where the B-17s usually operated, and they don't need intercom as they can hear one another despite engines which bellow even louder than actors in American war movies. Fond memories of many hours in Hastings/Halifax include shouting directly into the ear until intercom was plugged in, the noise of big pistons is incredible.
CGI etc cannot approach William Wyler's original Memphis Belle of 1943 with its action sequences shot during real life raids.