Hi manxmac, I’ve no ideas about your video, but regarding your question about contrails:
…why the contrails seem to be intermittent. I have observed many planes with the standard small trail behind but then in certain places the trail be a few miles long from various planes on similar flight paths over several hours.
A good observation; the reasons for this have been broadly understood for many decades.
The main factors in contrail formation and duration include the temperature and humidity of the air (affected mainly by altitude ... Read even more
