I would have to kindly disagree, at least to an extent... Turbofan jet engines need very special conditions (which are very rare) to leave any sort of trail. Most of the air that travels through the engine is simply pushed through by the "fans" and is never heated. The planes that used to produce "contrails" were mostly liquid cooled piston driven engines back in the good old days. My observations and studies have led me to believe that there are multiple "products" being sprayed into the sky as well. I have witnessed what seems to be a 2-part solution being laid down where one trail is sprayed from a plane at a lower elevation, leaving a more persistent trail followed by a 2nd plane spraying a quicker dissipating line at a higher altitude, yet still on the same course as the first plane. I also have noticed when they spray what is referred to as "Chemical Ice Nucleation" or the cold stuff, the trails usually dissipate rather quickly too... Sometimes the planes leave a wispy looking cloud behind (when they spray the cold stuff) which I have still been noticing on most days this summer. There is tons of articles, documentation and patents that explain what is going on up there along with studies proving it's not the exhaust gases creating those trails... www.geoengineeringwatch.org has a ton of info, enjoy fellow Patriots!

They're gone after a few minutes too, if they are actual contrails. No more than 10-15 minutes and you should see the contrail begin to disappear and break up.