My dad has always been into flying and aviation so he was always pointing out things in the sky to us when we were kids. He would ask us if we knew what type of plane or jet it was when something flew over and he usually had an answer. So our attention was on the sky often.
The interesting thing is that as a small child I have tons of memories of contrails dissipating and none of them sticking around and turning into cloud cover, none.
I guess I shouldn't believe my lying eyes and just trust the talking heads that this is all just a "conspiracy theory."