This Facebook group is looking for a pilot to test a chemtrail: https://www.facebook.com/groups/PilotWanted/ Now if someone were to go test a persistent trail, and find it to be ice, then that would at least disprove the notion that ice contrails cannot persist. And if they tested it and found it to be anything other than ice, then that would be solid evidence for the chemtrail hypothesis. So let's see if we can figure out exactly what would be needed? What type of plane. How to decide what to sample. How to test the samples. Can we come up with a test plan, and costs, to help people decide what to spend money on? Are there alternatives besides renting a plane? Could you use balloons, or rockets? Are there some cheap and dirty plane options? You could use something like a Beechcraft King Air 200, which can cruise at 35,000 feet, charter for $1185 an hour. Could you just sample cabin air? Would that work in theory if there was a contrail made of powder?