Danny: Report from 2000 - The "Diffuse" plume. How diffuse? What concentration? You are saying that we shouldn't resume flying because of the unscientific analysis of a few odd commercial flights. You are saying we should stop flying because of the unscientific wording of a single military report!
I am not saying that because you can't see it, it is safe. What I am saying is that without proper research, which is doable, we might just as well all give up and go home now. The "safe" solution is not to fly at all. The gungho solution is to say we can't see anything, or well, it's a bit grey, but hey, it's okay. Probably. The scientific solution, the sapient solution, is to properly analyse and manage the risk. It is only in the last 24 hours that Europe has come close to doing that, but even then as far as I can tell, it's not based on proper research, but on setting aside former assumptions about risk.