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SpaceX’s Starship breaks up mid-flight, forcing airlines to avoid debris
(www.aljazeera.com)
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There were procedures in place to prevent exactly this and they worked just fine.
Was one of them that it wasn't made out of cardboard or cardboard derivatives?
Ironically, cardboard and cardboard derivatives would have safely burned to ash and been scattered in the upper atmosphere. There's have been no reason to close the airspace if that were the case