This?
I saw a strange aircraft around 1980 give or take.
I was visiting my parents who lived near the edge of the Eglin AFB reservation. It was common to see various planes flying around and also doing bombing runs as there was a bombing range nearby.
One evening it was almost dark and I was walking near the edge of the woods. I saw a jet fly over, not very high. I only got a short look and it was a bit dark but what I saw looked just like the model airplane kits which were supposed to be the stealth fighter.
It turned out they in fact looked nothing like the real F-117. On the other hand I saw a plane that looked like nothing I have ever seen before of since. Totally rounded wings.
The fact that they were flying it at night over an area unlikely to have people makes me think it was an experimental plane which may or may not have ever been produced.
This?