Last USAF KC-10A Heads For The Boneyard

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For the DC-10 yes I agree 53 years, but the 1st flight of the KC-10 was 1980, so 43-44 years. The original DC-10 design (DC-10-10) did not have the engine power, or structure to support the weight increases needed for the tanker design, until the DC-10-30 model 1st flew in late 1972, so depending on how you look at it 43-54 year old design. Still hard to believe.
 

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