You are so right.There is a wealth of information on this subject available on the internet. Try reading more than one article of viewing more than one video. Or not!
There are tons of sources that say they are "chemtrails" and tons of sources that say they are "contrails."
I have read both sides of the arguments. Knowing how jet engines and prop engins work, the latter is most accurate.
if you merely consider the length and width of these trails, mathematically you couldn't hold enough liquid in a plane to form chemical trails miles long. Even the C5-Galaxy wouldn't pull it off.