I am totally unconvinced of chem trails. I spent a couple weeks in Newfoundland which is under the flight path to and from Europe so planes are at very high altitudes. with nothing else to watch except the occasional moose I watched as dozens of trails formed and dissipated over several days that i was paying attention. Planes at higher altitudes left a longer lasting trail, lower ones had there trails dissipate in a few minutes and even lower planes left almost nothing (visible) behind.
IMHO
Peace