[JesseK]

Carry a pamphlet about your team. Ramble on and on about robotics, STEM education, and some organization called FIRST. Encourage the folks at security to become involved. If there are enough high school students with you (even better if they're in team t-shirts), TSA won't question your motives. Also make sure that the batteries are marked and there's nothing sharp/pointy on your bot.

This is how we transported much of our FTC gear to championships last year. I'd read the docs above just to be sure nothing has changed.