1919
- August 23 - Warsaw, Poland - during a public ceremonial flight of the first aircraft built in a free Poland CWL Słowik (a copy of Hannover CL.II), in a presence of Polish chief-of-state Marshal Józef Piłsudski, the aircraft crashed due to faulty strings, killing two crewmen, including its constructor Karol Słowik.
Read more about this topic: List Of Air Show Accidents And Incidents