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Lockheed C-121 Constellation
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<p>The Lockheed C-121 Constellation is a military transport version of the <a href="/facts/Lockheed_Constellation/IzreIUqh">Lockheed Constellation</a>. A total of 332 aircraft were constructed for both the <a href="/facts/United_States_Air_Force/7MxWBYlc">United States Air Force</a> and <a href="/facts/United_States_Navy/xYK0fUou">United States Navy</a> for various purposes. Numerous <a href="/facts/Lockheed_EC-121_Warning_Star/n7GasVHT">airborne early warning versions</a> were also constructed. The C-121 later saw service with smaller civilian operators until 1993. </p>