The UK news is currently reporting the introduction of "armed marshalls" on some USA bound flights from UK.

The BALPA (pilot's union) are unhappy with the fact that guns will be on board planes. I can see the pros and cons of both sides of the argument.

But what I have been wondering is, now don't shoot me down (no pun intended), I have never been to the States, and am ignorant in gun law, but how do people travel with their guns in USA? If you are going from one state to another by air, and can legally have a firearm in both states, where do you put it when you board? Do they go in the hold?

I'm sure they must, but would appreciate knowing from them that know.Or are they just not allowed? I know I will feel a complete fool when I find out, but if I don't ask I will never know?