sparrow Wrote:
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> Contrails.
>
>
http://en.wikipedia.org/wiki/Contrail
>
> "Their formation is most often triggered by the
> water vapour in the exhaust of aircraft engines,
> but can also be triggered by the changes in air
> pressure in wingtip vortices or in the air over
> the entire wing surface.[1] Like all clouds,
> contrails are made of water, in the form of a
> suspension of billions of liquid droplets or ice
> crystals."
I bet you believe in global warming too, right?