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Just a rocket booster reentering? These happen regularly especially now that launches are more frequent in US and China.

It seems to match up with https://aerospace.org/reentries/cz-11-rocket-body-id-46463

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That is a link to Chinese satellite launch mission. Would the booster even be noticeable in the US at aircraft altitude?

Yes, re-entry can survive for the lower velocity orbits all the way to ground depending on debris material and orientation. Air density is 20% at 40k ft, so much more likely to make it that far.

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