 At the outbreak of World War II, the Potez 39 remained in service with seven observation squadrons of the French Air Force, but these, along with the Breguet 27-equipped units, were withdrawn from the front in October 1939.The Potez 39 continued to serve in training units until the armistice of June 1940, at which time 41 remained in Metropolitan France.These aircraft were scrapped soon afterward.