They are all contrails, some can last seconds others can last...

  1. roaminoz
    19,079 Posts.
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    16/01/18
    23:49
    Post #: 30357623
    They are all contrails, some can last seconds others can last hours. It all just depends on the height of the plane and the atmosphere conditions at the time.

    http://contrailscience.com/how-long-do-contrails-last/
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