Seen many missile launches? You think they are going Mach 5 from the get-go? Takes them a while to get even up to airliner speed. They do indeed look quite slow, and continue to look slow as they head farther away from you. About the only time I saw one move fast was after watching it into the upper atmosphere or near space, and something separated, like a MIRV. The two parts diverged very fast. Believe me, I have seen a lot of launches.
I have seen MANY launches. Back in the 70s I saw a Sprint air defense missile launch. That thing was FAST! Just like a small Estes rocket. Everything on-board the Sprint was made to withstand a 100 G acceleration. Yes, 100 Gs.
Both were out of the atmosphere in a quarter of the time that this "missile" was recorded travelling. Maybe faster.
They launch, they're up in the stratosphere in a brief moment, and then they disappear into space like the taillights of a car driving off into a foggy night. The contrails go wildly screwy in a zig-zag fashion all over the sky in just a few minutes after launch.
I'm thinking that this mysterious "missile" is a jetliner or a Gulfstream corporate jet.
Well, I’m an airplane nut, and a veteran of many long battles with chemtrailers over the years, and I have lots of time and experience looking at and explaining contrails. :-)
$20 to FR says it’s an airliner’s contrail. :-)