I was just reading through some of my highschool notes... in it was a bit from a B-29 pilot. (A classmate's grandfather) who was on rotation and went off shift just before the Enola Gay was given the green light. The other person we chatted with that day was a teacher's father who survived Auschwitz as a little boy. Between the two, and watching Shindlers List with them with us only a few years before both passed away, I'm a going to say B-29. I also know my grandfather (who died around when I was born) happened to have worked at the Martin plant near Omaha around the time these beasts were being built. Second has to be the P-51. I got to direct one to take off and land at Tallahassee Airport almost a decade ago. The P-51 pilot and his son kept trading places doing a dance with that monster. They'd kill power on landing and see who can get her into the parking spot further and further out. The dad won, killing engine at something like 200 m off the deck and still getting all the way to the spot. He also toasted the brakes, and I have a bolt from that repair work in my toolbox. I will never part with it.