In 1946, Ray Palmer was already taking reports of flying "unidentified objects," "UFOs" and taking the leap to interpret UFO Sightings as "Space Ships." May 1946, Amazing Stories: Sgt. Dirk Wylie reports his 1942 UFO Sighting of a "glowing unidentified object," to which editor Ray Palmer replies, "We have other reports of space ships." Also see inside back cover: "The King of the World," an ancient astronaut from Venus who could give us technological gifts to end war on Earth.
https://archive.org/…/Amazing%20Stories%20v20n02%20%281946-… credit Curt Collins