Source: https://www.youtube.com/watch?v=x1Fbyxlfxk4 This thread is for posting close-up videos of contrails forming and evolving. It's just a general collection to help people who are interested look at exactly what is going on. It's also useful to have some high definition close-ups of phenomena that have described as "spraying" in the past - particularly full-wing aerodynamic contrails. The above video I took today around 7:40AM PST (15:40 UTC), it shows a plane leaving both aerodynamic and exhaust contrails. The interesting bit is in the first two seconds, where you see the aerodynamic contrail swirl around the exhaust contrail. Ideally add the info about the plane, but it's not required. This is Alaska 412, N546AS, a 737-890 at 35,000 feet.