About 10 years ago, whilst I was living in Devon, I met a man who was ex-RAF. His job in the RAF was flight control. He brought chemtrails to my attention, not just by pointing up to the skies, but by telling me about the planes that take off loaded with these noxious chemicals. Shortly after I introduced him to my then boyfriend, also ex-RAF, he was a main frame fitter, their conversation was VERY interesting.
Their info/conclusion is that whoever they are are spraying the atmosphere for whatever reasons best known to themselves, they are doing it. I would like to point out that both these guys are now in their 50's (one is just 60) and have been around long enough and in the military at a time when we the public were not so aware of these shenanigans.
Since then I have discussed this topic with all manner of people from scientists to conspiracy theorists.
Yesterday, at a carboot, it was twilight, and I noticed them starting to chemtrail. They started in the distanc, 4 of them starting at a central point and then fanned out, over my head and then off into the distance. I have seen this 'formation' on several occasions. They then proceeded, aided by other planes to form the horrendous criss cross patterns that we see. I watched these planes as I always do when they are spraying en-mass. You could actually see these planes stopping spraying, turning around and coming back to lay another trail across the one they had just put down. It doesn't matter one jot to me whether people believe they are contrails or chemtrails, all I know is, planes either military or commercial don't go playing naughts and crosses in the sky with each other, they go from A to B. End of.
They are at it again today.

Jane