American allies across Europe want used F-16 fighter jets, but there might not be enough planes to go around, U.S. Air Force officials say. First produced in 1974 by General Dynamics and built since 1993 by Lockheed and its successor Lockheed Martin, the F-16 is attractive to some NATO allies that are increasing or planning to increase defense spending and weapons purchases in the wake of Russia’s 2014 annexation of Crimea.

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