I do not know russ personally but have come to admire him as a person for what he has done with this forum and to educate people about many health issues , that being said , in my 21 years in the military I was an aviation mechanic for 18 of those and have worked and flown on many different types of aircraft and know for a fact that contrails are a part of high altitude air travel , it is the same as seeing your breath on a cold day ,but in a much larger volume, this is why you will never see contrails at low altitudes ,it is just to warm for condensation to form the aircraft engine ,

,but there are times when aircraft will spray pestisides , we had aircraft spraying over our house about 4 years ago ,they were trying to get rid of the gypsy moths in our area because of the damage that they do to the trees , and felt sick for a week just from that