And your point is?
Did you skip over the explanation of what is creating the contrails? The physics are identical regardless of the type of engine.
Heat and water vapor is produced by the combustion of fuel in jet, piston, as well as liquid and solid rocket fueled engines. In fact, the more efficient the engine is, the more water vapor is produced. Turbine engines have been becoming more and more efficient with advances in technology, so the amount of water vapor produced by modern aircraft is actually more than those older style piston engines.
Have you ever seen a space shuttle launch? Depending on the conditions, those contrails can last for hours as well and spread just like persistent "chemtrails".
Here's a remnant of a persistent vapor trail from the Space Shuttle Atlantis.
Another (not sure which shuttle mission this was):
Can you answer the question why some naturally formed clouds linger and others dissipate quickly? Since a contrail is merely a cloud of ice particles, it stands to reason that depending on the conditions in the troposphere, that some will persist while others vanish quickly.
Here's a nice view from aboard a 747-451 over Alaska. This photo was taken from an ordinary citizen. The aircraft above is Northwest B747-400 turning right to join the photographer's air route. The one below is a Singapore Airlines B777 on the same route.
Med,
Believe it or not, I'm in full agreement with you when it comes to not trusting what people in the government tell us. There is no doubt in my mind that there is and have been clandestine operations going on, some of which may have been directed against civilians without their consent. My problem with this is that the science doesn't support the claim. Being in the field of science myself, I find these meritless claims very disturbing. The quality of science education in this country is already dismal enough without perpetuating this kind of pseudoscience as fact.
If chemtrails exist, fine, show me some real evidence, not just conjecture and speculation. Let's get some samples and analyze them. The means to do actual scientific inquiry into this phenomena is not out of our reach. I'm sure with the number of 'chemtrail' advocates out there, a group could pool resources and use high altitude weather balloons or charter an airplane to go up and take air samples. Is the commercial aviation industry in on the conspiracy? If not, what type of plane produces chemtrails? Why don't we see pictures of these special aircraft. It's not like high powered telephoto lenses aren't available. Why haven't any general aviation pilots reported anything unusual?
I also have yet to hear any reasonable explanation as to what the purpose and the composition of these chemtrails are. After 40+ years of these things, shouldn't we (or the chemtrail producers) have seen an effect by now? Also, if it is a clandestine operation, why make them so visible and at such high altitude? Any chemical dispersed that high up has a very low chance of reaching the ground. If Skunkworks can design stealth aircraft that eliminates real contrails, don't you think these black ops folks would use the same tech to hide their chemtrails?
You can believe I am drinking the government Kool-Aid if you want, but I would have to disregard too much logic and science for me to believe in chemtrails.