Be careful of any sort of metal, tubular things in your baggage. I once was flying w/ 2 artist's tripods w/ telescoping legs in baggage, along w/ lots of oil paint tubes. Lead tubes I believe, they showed up as a blob on their scanner.
Suddenly flashes went off, and I was surrounded by several men in suits who looked like lineman for the Miami Dolphins football team. They were sorely disappointed that I was just another crazy passenger and not a terrorist.
Whenever I can, I take the train. Very casual, just stroll onto the train w/ your ticket, and as long as you're half dressed, half sober, and look OK, no problem. Off to the cafe bar to spend $16 on a microwaved sandwich and a Dixie beer (only on the City of New Orleans train, you're stuck w/ Bud, Coors and Miller on all the rest). The glassed in observation car is always full, what a great view.