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.
