

Regular airplane made clouds are enough, don’t need any conspiracy. It’s leaded fuel as well, so we’re being sprayed with lead particles (because profits, there is no technological reason they have to use lead) while the clouds they can leave in certain conditions add about 100% warming effect when compared to just the CO2 spewing.
https://www.knmi.nl/over-het-knmi/nieuws/hoe-dragen-vliegtuigstrepen-bij-aan-de-opwarming-van-de-aarde dutch source for this claim.
Oops, thank Glob I was wrong! still dumb that avgas for piston planes use it but thats a whole different story.