I don't remember seeing them in the 80s or 90s. 2000 or so was when I noticed them. However I believe I first noticed them only when I had read about the chemtrail theory, so it was kind of a confirmation bias thing.
Still, I believed the questions I've brought up can't be ignored. Here's a new one: Which "Disney Movies" did this guy allegedly modify for 60 million dollars?
I didn't need to. I've seen them over 10 years ago already and believe them to be genuine.
Is this AI reliable? Do you trust what AI says?
Fake" for AI just means that a photo doesn't match the terabytes of other photos it has to draw on. The AI probably was not trained on photos that were taken from the surface of the moon and is not going to be able to identify it.
There's also plenty of video of ww2 persistent contrails
Also note how the trails "turn off" as some variable changes (throttle lowered, altitude change or change atmospheric conditions...)