Boing Boing: Why is American Airlines gathering written dossiers on fliers' friends?

Cory Doctorow: "Last week on a trip from London to the US, American Airlines demanded that I write out a list of the names and addresses of all the friends I would be staying with in the USA. They claimed that this was due to a TSA regulation, but refused to state which regulation required them to gather this information, nor what they would do with it once they'd gathered it. I raised a stink, and was eventually told that I wouldn't have to give them the requested dossier because I was a Platinum AAdvantage Card holder (e.g., because I fly frequently with AA). I have written an open letter to AA asking for details on this -- see the link below for the whole text."

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Man, what is up with that? The lockdown begins...