Libellula
This twin-engine British experimental craft was primarily a military plane, though it had incredible potential for civilian purposes as well. First flown in 1945, it possessed incredible endurance and range for such a relatively lightweight transport/bomber. Uniquely, it was the first heavy bomber specifically designed to land on aircraft carriers. The Libellula was able to deliver a 2,000-pound payload out to 1,600 miles and cruise at 400 mph… quite an impressive list of specs for that day and age. As a civilian plane, it would have served as an incredibly powerful medium commuter plane.