That’s one of the little details that impressed me, the little corkscrew movement that one might expect from a missile making a course adjustment.
Also, as I understand it, for a jet to leave a contrail, it has to be at a pretty high altitude. It won’t have one below a certain height, and as others have noted, the breadth of the lower part of the trail seems too wide to be from a jet approaching from as far away as the horizon, which does reinforce the idea that it is vertical lift.
Can’t help but wonder, if they’re trying to use that USAir flight as an explanation because of its proximity, maybe that flight isn’t the explanation for the plume, but was an intended target a la TWA 800, only the aim was off this time.
I meant America West flight, not USAir.