I don't think it really matters what the TSA say, I have discussed this aspect on other forums and invariably when you have someone who "works in airport security" what the law says, what TSA says and what the individual carrier's policy is doesn't matter a d*mn. Just obey the security officer and don't question anything "he is the law and knows it better than anyone with a law degree or even the simple ability to read". What is it about people who work in airports? I've had check-in staff tell me reading material counts towards your cabin baggage allowance while the sign on her desk plainly states it doesn't. They make it up as they feel like it and if you argue, they'll make damn sure you miss your flight.