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From what I've seen, anything entering the atmosphere and burning up, produces an erratic trailing plume, typically branching as the object fractures under the stresses.
A large bolide that bounces off the atmosphere CAN produce a somewhat aircraft-like trail, but would be faster moving than any high-altitude plane. I've seen video of a whopper doing just that over Alaska in the '90's and it was a spectacular sight.
But why not an aircraft contrail, Stephen - surely that's the most likely source? They seem to be prevalent in the current WA weather conditions, too.
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