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What speed milestone did test pilot Scott Crossfield reach in November 1953?

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  1. Mach 2, twice the speed of sound
  2. Mach 1, the first supersonic flight
  3. Mach 25, orbital speed

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References

  1. D-558-II Skyrocket, NASA www.nasa.gov/aeronautics/d-558-ii-transonic-aircraft Checked 2026-10-10.

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