Chemtrail Classic "X" Pattern

I have noticed this before when you have a crossing pattern between contrails. Why would airplanes by flying in this pattern over a major metropolitan area? The chemtrails were fresh with lots of plumage. The theory that makes the most sense to me is that they are depositing aluminum to reflect sunlight and radiation to offset the effects of global climate change. They may have done to much because the weather in North America hs not been normal with snow now for several months.

Have you seen these crossing formations before?