 30 years after his first flight tests, four eyewitnesses gave a legal testimony certified by a civil law notary in 1933 to having observed his August 1903 flight and that the given data was correct.According to Heimatforscher Wolfgang Leonhardt (see ) quoting from Jathos's notes as well as NDR Fernsehen journalist Gunter Hartung, by November 1903 Jatho had managed to achieve a continuous flight of 60 meters at 2.5 meters altitude, a month prior to the 17 December 1903 pioneer flight of the Wright brothers only spanning a distance of 37 meters or 120 feet.Jatho eventually gave up, noting "In spite of many efforts, (I) cannot make longer or higher flights.