Talk:Lockheed D-21/M-21

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RE: "The D-21 has the best lift-to-drag ratio of any supersonic airplane ever built. Second place goes to the XB-70." from { http://www.labiker.org/xb70.html#finalflights }: Are we considering LABiker.org a primary source on supersonic lift-to-drag ratios?

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Talk:Lockheed D-21/M-21

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