After 9/11 when planes stopped flying the pan rate (a measure of sunlight reaching US) increased dramatically. Contrails are contributors to global dimming. Stopping them would be “interesting” in terms of the global climate science.
Discussion
They have been continuously spraying chemtrails for at least 3 years now. Contrails are harmless. They dissipate very quickly, chemtrails remain for hours spreading to maje a formless cloud layer. That is the dimming