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The rarest Blackbird #M-21

[igp-video src=”” poster=”https://www.edparsons.com/wp-content/uploads/2023/08/the-rarest-blackbird-blackbird-m-21-museumofflight-aviation-planes-aviationphotography-aviationgeek-.jpg” size=”large”]The rarest Blackbird #M-21

The M-21 was a very special variant of the A-12/SR-71 Blackbird family. Two M-21’s were built to act as motherships to the D-21 hypersonic drone.

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