Your assessment, Pbman2, is nothing more than a poor guess and you should remain silent on subjects for which you are ignorant or uneducated, IMHO.

Condesation trails are a byproduct of burning a hydrocarbon fuel in a sub-zero degree atmosphere. The water vapor (condensation) that is created by burning thefuel is hot when it is propelled out of the jet engine and it is white (exactly like a cloud) and easily visible from the ground. As that water vapor freezes into small ice crystals it becomes invisible from the ground, this freezing sequence takes about 30 seconds to occur. If the condensation trail remains, then it is something else altogether and NOT water vapor. Chem trails remain visible for hours as they dissipate and spread in the upper atmosphere. The spraying of these chemicals is part of the insanity of a geo-engineering program designed to address a problem that exists only in the minds of Globalists who want to tax us into the trillions to solve it.