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Oh you dont? I can tell you. NOTHING.
Its watter. Condensation.
Why are they different?
Planes fly at different heights, in different pressure, different humidity, different temperature. And these things vary a lot, thats why they look different each time.

Have a full cup of scientific consensus.

Right...so we've been looking at these planes fly all our lives and just now they started flying at different heights and under different pressure and humidity...

They don't look different every time, there are two types of trails and one of them has only been around for a couple of years. Couldn't care less about what you decide to call consensus, we're not blind.

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