About the trails, I am curious as to why I can observe two planes simultaneously; one will leave a quickly dissipating trail that is gone in minutes, the other will leave a trail that spreads into long lasting cloud cover. Is there really that much variation in atmospheric conditions at any given time that this can happen? Is it something to do with various fuel mixtures/types in the different planes?
Many times I have noticed that the plane at a higher elevation will not leave a large trail, while the lower altitude aircraft will be leaving the long-lasting, massive trail. I thought if anything, the trails would be more likely to form at higher altitudes.
Twenty-thirty years ago, I don't remember ever seeing trails that form large clouds that last many hours - if not all day. I've only noticed this in the last ten years.
I've also noticed the trails that have gaps in them, like the 'smoke' is shut off for a few seconds. It is not an illusion.
I'm not pushing any conspiracies. These are just some things I have wondered about that the simple explanation of it being 'common contrails like there have always been' (or something to that effect) just doesn't seem to be a good enough explanation.