FLYBOYJ
"THE GREAT GAZOO"
Operating in a forward combat area (Henderson Field, Okinawa, Malta to name a few)What sort of sortie would be 20 minutes - other than an aborted one?
I think you are intermixing sortie with combat mission. They are not necessarily the same. A sortie can be any flight, for training, maintenance or a joyride. A combat mission is one where the aircraft goes into bad guy land.
If you are talking about sorties, the aircraft that would be at the top of the list would be trainers, slogging along day in and day out for years with good pilots and knuckleheads.
If you are talking about combat missions, that is quite different. Keep in mind that a lot of fighters of the era were not designed to be still flying today. A good example of this is the F4F Wildcat. I was chatting with a guy that worked on the one near here and the wing fold hinge doesn't have a grease fitting. They didn't bother adding the weight for one because they figured it would average about 25-30 hours before it would be lost!
The B-17 "Knockout Dropper" flew 75 missions with the 303rd BG and came through those missions nearly unscathed.
BINGO!