Would it have made a difference? There seem to be different performance figures around for it, some showing a top speed of less than 400mph, which would have made it vulnerable to allied prop fighters, never mind any emerging jets, which also brings up the point of all these ‘wonder weapons’; advances were going on on both sides, had the war lasted long enough for the Ju287 to enter service, would it have been up against Mustangs and Tempests or would it have met Meteors, P80s, Vampires etc?