The D-558-1 Skystreak and the D-558-2 Skyrocket were 1947-48 experimental aircraft, which first nudged, then penetrated the sonic barrier. The jet-powered Skystreak reached 651 mph; the jet-and-rocket-powered Skyrocket was flown at 1,327 mph (Mach 2.01).

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D-558-1 Skystreak

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