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Everyone (and his brother too) interested in ww2 knows a thing or two about the P-51/Mustang.
So - how much of an impact on the said war would've made an earlier introduction of the Mustang in the non-RAF Allied airforces? Better engines earlier? USAF not dragging their feet for months to actually test the XP-51? Additional producion surces as early as possible? Possible/fesible German/Japanese reply? Changes in RAF's doctrine and design & purchase of new fighters in the UK?