After an observation I made about an hour ago I must say I can understand why technically uneducated people "fall" for the chemtrail "theory".
It was five o'clock in the morning and the sun just raising. I could see two airplanes, one flying roughly west, the other roughly south in the same area of the sky. While the plane flying west had a long, persistent contrail the contrail of the other dissipated almost immediately.
Of course there is a very simple explanation:
I live in an area where there are three international airports within a range of no more than 100 miles and several "air streets" are crossing above my place.
The plane heading west was very high and on it's way from a distant to another distant airport flying at cruising power, the other was lower (but still well above 10000 ft) and had reduced power because it was approaching an airport in the vicinity (VIE, abt 50 miles away). The different behavior of the contrails was due to different altitude and different throttle settings. Different types of engines may as well have played some role.
Given the fact that it is not easy to estimate the altitude of an airplane the different contrail behavior could easily misinterpreted by technically naive peole
A slight correction: The persistence of the contrail does not depend on the throttle setting or engine type (at least only marginally), it has everything to do with the conditions in the particular altitude of the plane.
But, as you mention, it is impossible to judge the altitude of a high-flying plane, even within miles, and since a few hundred yards can make a profound difference in contrail behaviour (there are various tresholds for condensation and evaporation), thw planes that seem to be in exactly the same altitude can show very different contrails.
All this is very likely Greek to people with little knowledge of technology and meteorology, and that is fine. But then why do they (some of them) insist on making their own conclusions? If you have little knowledge of some area, you must simply trust those who know.
Anyway, it is not from the study of the skies you can realize that the chemtrail theory is bogus. It is, if you think about it, probably the most bizarre of all CTs:
Some operator (be it the NWO or whomever) runs a clandestine operation to spray more or less the entire globe several times a week, for whatever evil purpose. Such an operation will require thousands of planes, the cooperation of tens of thousands of crew, maintenance people, people producing and distributing whatever it is they spray,
plus ALL air traffic controllers, both civilian and military, ALL OVER THE WORLD. It has gone on for decades, but not ONE of all these people, although they themselves and their families and friends are among the victims, has EVER spilled the beans.
.... I mean, for any normally thinking person, the whole thing should stop right there. You don't have to know a thing about planes, clouds, or condensation physics. You don't even have to go outdoors.
Hans