Flying in a helicopter over the jungle in Sumatra early ‘70s - rainbow ahead - suddenly it was a circle, all the colors visible and we were in the center of it. I stopped telling the story of my experience because no one believed it was true.
I was involved in remote oil exploration for Pertimina, the Indonesian Oil Co.
Nice to have it confirmed. ;-)
I once saw a rainbow and some jets flying through where they appeared in the sky and wondered if people in jets would be able to see more of a rainbow if they were correctly positioned, and now I know :D
I have seen the same thing from a helicopter over Kauai.
So yes, I believe you.