I left communist Cuba in 1966 at the age of 7.
When we lived there we would rarely see jet contrails overhead. My dad told me it was Santa flying recon to see if the kids were being good.
This was a time when jet contrails were very rare as there just weren’t that many jets flying and most likely, the ones flying high enough to leave contrails were US or Russian military planes. We would only see them infrequently.
You couldn’t pull that one today as there are many contrails visible all day long but back then, when I saw a contrail I was very mindful to be behaving!
LOL
It’s GREAT being a kid and being able to believe such things.
Too bad our brains have to grow :)