Is this why United, TSA clashed on Twitter over comic books on planes?

Passengers flying with United Airlines UAL, -1.59% out of San Diego — site of the popular Comic-Con event this weekend — were greeted by a message telling them to remove books from their checked luggage. United then responded on Twitter to a post with a picture of the message saying the requirement was set by the Transportation Security Administration.

I’m just a cat, but @SD_Comic_Con you might want to give people a heads up on this. pic.twitter.com/6pmcm9pjXV

— Yuki Da Kitteh (@YukiDaKitteh) July 23, 2017

The restriction on checking comic books applies to all airlines operating out of San Diego this weekend and is set by the TSA.

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