they are short - a few plane lengths
they dissipate as quickly as they form
these photos of chemtrails are so obvious, I wonder why you would like us to think they are something that they very obviously are NOT. hmm.
if you've ever seen a car on a very cold day, it leaves a small vapor trail when the hot exhaust leaves the tailpipe. The exhaust equalizes in seconds with the ambient air temperature and vanishes - just as a contrail.
what you see in these photos are chemtrails from spraying. Their length alone is proof.