The Lioré-et-Olivier LeO 457 was to be a high-altitude version of the LeO 451 medium bomber. Five examples were on order at the start of the Second World War, but none were built and the order lapsed after the French armistice in June 1940.
How to cite this article:
Rickard, J (12 May 2011), Lioré-et-Olivier LeO 457 , http://www.historyofwar.org/articles/weapons_liore_et_olivier_LeO_457.html