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equi
22:32

Those are literally water vapour.

The main products of hydrocarbon fuel combustion are carbon dioxide and water vapor. At high altitudes this water vapor emerges into a cold environment, and the local increase in water vapor can raise the relative humidity of the air past saturation point. The vapor then condenses into tiny water droplets which freeze if the temperature is low enough.

[https://en.wikipedia.org/wiki/Contrail]

Don't be the product, buy the product!

Schweinderl