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    Re: Contrail and Aircraft distance
    From: David Pike
    Date: 2021 Oct 12, 12:38 -0700

    One thing which always catches me out on a gin-clear, quiet day upon first hearing an approaching high-flying aircraft is that it’s no good looking in the direction of the sound to see the aircraft.  You need to look about five miles ahead of the sound.  Of course, if there’s no con trail, as sometimes happens, you also need to assess which direction is ahead.  DaveP

       
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