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We already determined we saw it at the same time, same stellar area, same object, and separated by about 620 km between observers.
It was atmospheric at HIGH altitude. There is simply NO way that 2 observers could see a cloud (stratospheric) separated by 620km.
It was - IMHO - of either NASA/Space-EX/Ruscosmos or even military in origin. There are no publicly available details of ANY rocket launches until 21 September, so this makes it likely military, and given the approx position in the sky, likely a polar orbit.
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