Dornier Do-X Flying Boat

Massive for its day and, with a greater wingspan than a Boeing 757, airliner-sized even today, the Doriner Do-X flying boat served as a luxurious means of interconental travel for up to 100 passengers in the early 1930s. Powered by twelve 600-horsepower V-12 piston engines, the 108,000-pound Do-X cruised at 110 mph for up to 920 nautical miles. Were it not for the effects of the Great Depression in 1929, it might have seen success as a trans-Atlantic airliner, but ultimately, only three were built and none survive today.