I've transported young rats on Delta several times. You have to put them in your bra when you go through security, and then transfer them into a box in your bag for the rest of the trip.
Last time I did it, the girl did *not* want to hang out in there, without popping her head out to look around. So I made a cardboard insert into my tank top (the kind with a bra built in) that looked natural, and duct taped her in for the security portion. She came dangerously close to escaping, but it was still successful.
Of course, who knows what they'd do if they caught someone doing this. Probably put them on Homeland Security's no-fly list or arrest them for being a terrorist. And of course, that's a terrible way to fly multiple rats, or do often if you're going to shows. But it works in a pinch.
