Just Post

My meteorology professor at ERAU liked to call them "Cirrostratus Anthropogenicus."

Contrails have jet exhaust in them, so mostly air with a bit less oxygen and a bit more CO2, some soot and hydrocarbon based nonsense.

The really stupid thing is "airplane engine exhaust contains chemicals that are harmful to people's brains" is 100% verifiably true, it's just not jet contrails. It's small piston-powered planes that still run on leaded gasoline. The average student pilot flying a Cessna 172 is doing more to make the masses dumb than a 777 pilot hauling passengers.

Fortunately, a lot of light sport airplanes are able to run on unleaded automotive gasoline and there's been a proposal to expand the light sport rule to increase what can be an LSA and what you can use an LSA for. For example, it's currently illegal to use a light sport aircraft for aerial photography, because reasons. You have to use a Normal category airplane for that, which probably means a 1960's technology engine and 1960's technology fuel. But, we're fixing it.