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The P-39J designation was given to the last twenty-five aircraft ordered as P-39F Airacobras. The only difference between the two versions of the Airacobra was the use of an improved Allison V-1710-59 (E12) engine in the P-39J in place of the -34 engine used in the P-39F.
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How to cite this article: Rickard, J (7 July 2008), Bell P-39J Airacobra (Model 15B), http://www.historyofwar.org/articles/weapons_P-39J.html