Boeing KC-97 Stratofreighter

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What Wikipedia says

The Boeing KC-97 Stratofreighter is a four-engined, piston-powered United States strategic tanker aircraft based on the Boeing C-97 Stratofreighter. It replaced the KB-29 and was succeeded by the Boeing KC-135 Stratotanker.

Excerpt from the Wikipedia article “Boeing KC-97 Stratofreighter”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: USAF, Public domain, via Wikimedia Commons.