[keith A]

I think what can be said is that the ratio of three claims to one loss by Allied pilots is fairly accurate in almost all theatres from the Battle of Britain onwards. At times it was much less accurate (e.g. the Channel Front 1941-42). The richness of a combat environment led to several pilots claiming the same aircraft, with "aces" adding another level of enthusiastic descriptions of damage.

Both Russian and German claims throughout the war appear, after post-war research to be bizarre.