More than a century ago, we thought that heavy aircraft could not fly. Fortunately, we were wrong, and the Wright Brothers took to the air and left the world in awe. Then, decades later, the world was introduced to a massive flying vehicle. Boeing unveiled the largest winged machine at that time, the 747, which was dubbed the Jumbo Jet. This double-decked behemoth boasts a wingspan of around 200 feet and a length reaching 250 feet. People thought that it was too big to fly, but it handled well on its historic maiden flight on February 9, 1969.