Dane Wigington of geoengineeringwatch.org says that jet engines no longer create contrails. They were only created very high up in the atmosphere in the past and never persisted in long trails that spread out over the sky. The sprayers nowadays are flying lower in the sky. The evidence in this website is quite convincing and it's worth a visit. Wigington, a retired manager from Bechtel, is credible. Air samples show aluminum, strontium and barium in the spray. Before him, Clifford Carnicom and Rosalind Peterson were spreading the word about chemtrails.