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The Boeing KC-97 Stratotanker was a United States strategic tanker aircraft based on the Boeing C-97 Stratofreighter. For many years, it was the backbone of the United States Air Force's tanker fleet until replaced by the Boeing KC-135. The KC-97 Stratotanker was an aerial refueling tanker variant of the C-97 Stratofreighter (which was itself based on the B-29 Superfortress), greatly modified with all the necessary tanks, plumbing, and "flying boom." The cavernous upper deck was capable of accommodating oversize cargo accessed through a very large left-side door, or transferrable jet fuel was contained in tanks on the lower deck. Both decks were heated and pressurized for high altitude operations. The USAF began operating the KC-97 in 1950. It purchased a total of 816 KC-97s from Boeing, as opposed to only 74 of the C-97 cargo version. The KC-97 used piston engines, fueled by aviation gasoline, but it carried jet fuel for its refueling mission.

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