The problem is is that when contrails conditions are prevalent, all jets leave contrails equally. Is your argument that all jets are spraying, or only some jets are spring? Yes we have patents for spraying aerosols from airplanes. But how do we explain the absence of dedicated tanks in the airplanes? I know so many aircraft mechanics from my time working in the airlines. I have never once met someone that actually works in aircraft maintenance or operations that believes in chemtrails. They know that it is absolutely patiently ridiculous. Explain the mechanism. If there's no dedicated tanks and spraying, or injection into the engine, because we don't have those systems, then it must be in the fuel. Okay, well, as I reference above in a different comment, I worked in airline refueling after high school, we sample the jet fuel every time we refill in order to prove that we did not give them contaminated fuel. Nobody cared as long as I filed the vials. If I had taken a second vial of fuel a sample home in my jacket nobody would have cared. Because nobody cares because nothing's in the fuel.