Ferdinand Léon Delagrange died on January 4, 1910, when the wings of his Blériot monoplane folded during a steep turn.
Notes on verification
Multiple independent contemporary and modern sources corroborate date, location, aircraft, and cause of death, including period newspaper reports and Wikipedia articles.
Sources
- After Thomas Selfridge (smithsonianmag.com)
- https://historynet.com/french-aviation-pioneer/ (historynet.com)
- https://www.thisdayinaviation.com/tag/leon-delagrange/ (thisdayinaviation.com)
- http://www.motorsportmemorial.org/focus.php?db=a&n=8744 (motorsportmemorial.org)