The TSA asks about LiPo batteries in your luggage these days... just got back from Phoenix, and was asked if I had any. So that's something to check out. I don't know what the rules are, but I presume it's all about the fire risk. As for transporting planes, I guess it wouldn't be any different than taking along a musical instrument, etc... just make sure it's packed well, and if it's too big to carry on, then check it at the desk. I'd also pack my transmitter, etc. in my checked luggage - the TSA might suspect you of wanting to trigger something from the cabin if you take a radio on board. But what do I know... I'm glad I live in the Midwest and can drive to Flite Fest. Hope to see you there!
Cheers,
Gryf