Why did United try to ban Comic-Con travelers from checking comic books?

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Travelers leaving San Diego Comic-Con on United Airlines got an unwelcome surprise this weekend, when United said that comic books were banned in checked luggage. United claimed this was a TSA-mandated rule for all airlines operating out of San Diego — only to have the TSA publicly refute United’s claim on Twitter.
As The Consumerist reported yesterday, United posted a notice telling “Comic-Con attendees [to] remove all books from checked bags.” When people complained on Twitter, United confirmed the news. “The restriction on checking comic books applies to all airlines operating out of San Diego this weekend and is set by the TSA,” a spokesperson wrote. From there, things got even weirder: it told one confused attendee that only comic b…