I believe the russian 37mm was used in later models. I'd like to see the P-63 as it did see combat in the fall of Berlin. We dont need uber planes, agreed , but the P-39 & P-63 were far from uber. They were substandard to Brits and Americans but the Russians used it very effectively. Russias top P-39 ace had 60 kills. Come on this bird belongs in AH. And it fit all the CRITERIA. Oh P-400 & P-39q were good candidates too.