Not using a card or check, as Miguel pointed out, is a bit odd, because going from the US to Europe (or the other way) usually involves forking over at least £500, if you're headed to Britain, and probably much more to others, since there is a lot of competition on that route, coming out of Atlanta, JFK, Reagan, and Ft. Worth.  That's a lot of cash to carry around.  I'm not saying it should be illegal, obviously, but it can easily be seen as an initial eyebrow-raiser.

Where's your motherf*%&ing flag pin?