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Old 16-05-2018, 08:41 PM   #9
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Originally Posted by breaker View Post
Why do high altitude jet engines produce a “vapour trail” that spreads across blue sky creating a haze that blocks sun light ?
Because that is sometimes what water does at altitude

If vapour trails are an active occurrence due to the amount of air traffic, why did we have NO vapour trails in the sky for three consecutive days last week ?
Well gee, maybe the prevailing vapour content was not conducive to condensation.

Was there a world wide pilots strike for three days ?
Google it. There's a wealth of simple explanations on contrails.
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