Trails
It seems that the skies in West Wales have been bombarded with plane trails over the last six months or more. The trails seem to merge and form clouds. Today I noticed at least 7 planes giving off trails at the same time but when I took a quick look to check on planefinder, there was just one plane within 20 miles.
I have noticed that one plane went over at the same tim as the others and there were no trails and this one seemed to be showing on planefinder.
Can anyone tell me what these trails are and why?
Sorry if this is the incorrect section to post such a question.