I'm not rated to fly multi engine, The only one I ever flew at all was a Piper Comanche. Mostly, all I can recall was that they land HOT, 92 Knots IIRC. How do you train for three engines? Not as few as two, but not so many as four! In a twin, they say the one engine will fly you to the scene of the wreck, Is that true of three also?
Island Airlines? Is that the company that flew that short route (4 min s or so). When I first heard of it, they had three Ford Tri motors? I never heard much about it, but was always curious if they were still around.
Don't forget that William Stout , the designer of Ford's tri, Tried to revive the Ford Tri in 1958, I think he built two planes, one named "One More Tri"
It has been shown the usefulness of these old, slow planes more than once like the Trimotor and another one is the "Catalina" which dates to 1935. In Russia, The Antonov AN2 Colt is a biplane that seems to date from the late twenties but I'm told that they were made well into the eighties. I believe it's powered by 1000 HP Klimitsov Radial engine.
Terry