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Excuse me. Water vapor also disappears once it warms to the altitude. You can put a finger up to a plane in the sky and the "trail" will be no longer than your finger before it disappears.
Chemtrails don't disappear, they linger and slowly disperse and if there's enough of them they create a toxic haze.
I grew up in a Boeing family. Please don't try to tell me how a jet engine is supposed to work.
You sound like my Senator who gave me the same stupid explanation when I pitched a fit to him. He also claimed to have graduated as a chemical engineer but failed to disclose the college.
I have pictures. I have my white truck as evidence.