A little update: I just spoke with the tour company that takes you from the hotel to the airport and then on to the tour all day. They're recommending don't try to take it on the plane because if you have to check it you won't have time to pick it up from baggage claim as the group goes straight from the plane to the bus. Richard's experience is well noted. I'm guessing even if you showed a copy of a regulation opposing the TSA agent, it would get you nowhere because well, you're not exactly making their day, showing them up in public and all ... Then, even if I was successful in the morning on the way over, I'd have to also get lucky again on the way back. In the end, the tripod being the equivalent of a mortgage payment, it's not so hard to decide what to do.