Well the classic argument is that if its completely resin-free and you have no marijuana or other marijuana accessories that you'd be able to take it with you. I don't know how well this holds up when your bag undoubtedly gets checked and the TSA attendant, while holding up your bong, gives you a "How fucking stupid are you look?", they might try and get you on some technicality or actually find resin and such.

Additionally, you may not be able to bring it on the plane simply because it could easily be broken and used as a weapon. Mail it home or put it in your checked luggage.