The Wright Flyer
Here is how the Smithsonian Institution describes the Wright Flyer: “the first powered, heavier-than-air machine to achieve controlled, sustained flight with a pilot aboard.” They did not mention that it could not last over 59 seconds mid-air. On top of that, it was hard to manage and covered only 852 feet. The aircraft only ever flew four times on the 17th of December 1903. Pilots just gave up on it after that.
The Harrier Jump Jet
Across the globe, many realized just how useful the vertical take-off and landing fighter of the British Navy were. Taking inspiration from them, the Soviet Union made a Yakovlev Yak-38. The difference was that it did not work well and could only fly for 15 minutes when it was hot out. In optimal weather conditions, the aircraft only managed to fly 800 miles or so without weapons.