Note that contrails are different compared to grayish "vapor trails" at times observed when flying low with flaps prolonged. These are shaped of liquid h2o within the immediate decompression and cooling of air above the wings. Contrail testing staying carried out on an Airbus A340 and far older Boeing 707[seven] https://geo-engineering00998.losblogos.com/36698925/the-smart-trick-of-elektromagnetische-wellen-that-nobody-is-discussing