I only see one explanation for this... Other than the pilot turning on and off engines which I think is highly unlikely. (Edit: AND differences in
moister but to me it does not look like this) First 2 minutes of the video are all you need to watch, I wouldn't even bother having volume on, don't
like listening to these guys talk.
Could this be a pilot intentionally signalling?
edit on 1-9-2017 by InterstellarSloth because: (no reason given)
Since I can't watch rhe video, I will have to guess that the contrails appear and disappear.
Contrails form due to moisture in the exhaust (a product of combustion) condensing in the atmosphere.
Changes in temperature and humidity determine whether the water vapor is visible or not.
The atmosphere is not homogeneous, it has layers that have different temperatures and relative humidities.
If you have ever seen ripples in clouds, you have seen evidence that there are waves and currents in the atmosphere.
Aircraft enter and leave areas that have differing qualities, sometimes with minor changes in altitude or by flying into a wave on a layer.
This can make the contrails appear/disappear.
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