With their fearless undertaking on 15–16 July in 1931, György Endresz and Sándor Magyar forever etched their names into the annals of Hungarian and global aviation.

In the early 1920s, Fonó’s attention turned back to the unresolved problem of jet propulsion. By that time, it had become entirely evident that propeller-driven aircraft were unable to exceed a certain speed limit. In 1928, Fonó developed his invention called the ‘air jet engine.’