Project 1794: Declassified Records of a USAF–Avro Canada Supersonic Flying Saucer Effort

To the point

In the 1950s the US Air Force and Avro Canada pursued Project 1794, a supersonic flying saucer aiming for Mach 3–4 and extreme altitude, but it likely never left prototype while fixed‑wing aircraft dominate today and saucer sightings are probably human‑made rather than alien.

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US Air Forces 1950s supersonic flying saucer declassified
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US Air Forces 1950s supersonic flying saucer declassified

Tighten the strap on your tinfoil hat: Recently declassified documents show that the US Air Force was working on, and perhaps had already built, a supersonic flying saucer in 1956.