Once chemtrails became a thing, I did research.
From what I can tell, people think contrails are chemtrails purposely spreading all kinds of bad stuff.
I never found any actual evidence. Most was based on the father of chemtrail info whose name I don’t remember who showed a bottle or bottles of stuff, and results of lab testing (apparently) but never would divulge name of lab. I saw lists of pilots who had never seen any evidence of chemtrails or heard of any pilots talking about doing it, etc.
IMHO it is another myth.
Any holding tanks for something like that would be in blueprints. Or at least there would be space for those small tanks somewhere inside the aircraft.
There is always a little truth to these things.
“Chem Trails” have been used by our military in the past, mostly before
satellite radar made them less useful, to hide ground or low altitude activity
from satellites.
A clue to that was when they were so perfectly and thickly aligned as to
provide effective cover, and the same aircraft were flying repeating patterns
to place said cover.)
Other chemicals have been used for cloud seeding and experimentation.
What we all normally see every day, are simple condensation trails,
however.
~Easy
The trails were very severe during a number of years when Obama was in. I’ve recently seen a suggestion some of it was super high intelligence overflights. It occurs to me there were some huge volcano eruption along those years and I wonder if that could have led to it. Only thing is, personal anecdote here, but the darn things STOPPED when President Trump took over.