I was going to say this as well. There have been recordings from aircraft hud cams of UFO’s. This doesn’t address the OPs question about hallucinations or hysteria or whatever, but it does give a little credence to a claim of a UFO. I’ve seen a UFO, by definition, something unidentified, unknown, then it was gone.

My grandfather told stories of things he saw flying for Eastern Airlines and later American Airlines. My uncles who flew F-16s all saw strange things too.

Ask any aviator that’s been flying heavy for 10+ years what strange things they have seen and they’ll have some stories.

I’m glad we, as a people, are talking about it, without jumping to conclusions about what these objects are.

There are indeed a handful of truly unidentified and truly interesting cases, but I stress that unidentified does not equate to alien spacecraft. That is an unjustified leap that far too many people are all too willing to make.