Now, let me point out something in a couple of photos from the website linked above:
First, there is this photo:
Notice that there are FOUR engines, and FOUR "streams" forming behind.
Next, there is this photo:
You will notice that this aircraft has TWO engines and there are TWO streams forming behind.
This means that the STREAMS OF VAPOR are being created by the JET ENGINES.
Now, let's talk about jet engines.
All jet engines, which are also called gas turbines, work on the same principle. The engine sucks air in at the front with a fan. A compressor raises the pressure of the air. The compressor is made up of fans with many blades and attached to a shaft. The blades compress the air. The compressed air is then sprayed with fuel and an electric spark lights the mixture. The burning gases expand and blast out through the nozzle, at the back of the engine. As the jets of gas shoot backward, the engine and the aircraft are thrust forward.
The image above shows how the air flows through the engine. The air goes through the core of the engine as well as around the core. This causes some of the air to be very hot and some to be cooler. The cooler air then mixes with the hot air at the engine exit area.
Turbojets
The basic idea of the turbojet engine is simple. Air taken in from an opening in the front of the engine is compressed to 3 to 12 times its original pressure in compressor. Fuel is added to the air and burned in a combustion chamber to raise the temperature of the fluid mixture to about 1,100°F to 1,300° F. The resulting hot air is passed through a turbine, which drives the compressor. If the turbine and compressor are efficient, the pressure at the turbine discharge will be nearly twice the atmospheric pressure, and this excess pressure is sent to the nozzle to produce a high-velocity stream of gas which produces a thrust. Substantial increases in thrust can be obtained by employing an afterburner. It is a second combustion chamber positioned after the turbine and before the nozzle. The afterburner increases the temperature of the gas ahead of the nozzle. The result of this increase in temperature is an increase of about 40 percent in thrust at takeoff and a much larger percentage at high speeds once the plane is in the air.
The turbojet engine is a reaction engine. In a reaction engine, expanding gases push hard against the front of the engine. The turbojet sucks in air and compresses or squeezes it. The gases flow through the turbine and make it spin. These gases bounce back and shoot out of the rear of the exhaust, pushing the plane forward.
In other words, a jet engine is shooting out a LOT of HOT air - with attendant moisture - into a very cold atmosphere.
Next item to consider: how likely is it, do you think, that anybody in their right mind would put something OTHER than air and jet fuel into the combustion chamber of a jet engine?
Since the vapor is clearly coming out of the engines, as shown in the images above, in order for there to be some chemical being "sprayed," it would have to be coming through the engine and that's just not likely.
As I have said before, and I'll say it again, MOST of what is called "Chemtrail" activity is bogus and is simply the fact that there is a LOT more air traffic nowadays, coupled with changes in the layers of the planet's atmosphere. And, quite frankly, THAT is a problem! I suspect that the PTB would rather have people going on about the gov manipulating weather than to admit that what is coming, is coming, and the evidence is already there in the upper layers of the atmosphere.
And that is not to say that there is not SOME real "chemtrail" activity, but it is not the obvious stuff that people are getting excited about; that's just the distraction.