I see the sunset off the SoCal coast, several days each week. From the angle of Newport peninsula/Huntington Beach looking to Catalina Island. Similar angle as the so called “contrail.”
Today there were at least two “contrails.” Excellent sunset, too.
They are jet vapor trails, or exhaust trails. I have seen them for years and years.
> “They are jet vapor trails, or exhaust trails. I have seen them for years and years.”
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Turbine exhaust has no solids; its all water, co2 and hydrocarbons. A missile’s exhaust, on the other hand has considerable solid content, and shows up perfectly whether the atmosphere is cool or warm. They also have the distinctive helix caused by the mixing nozzle.