Just thought I would relate a semi-related tidbit on this topic.

My wife is a physician in Denmark-- she was specfiically warned by a med school professor that she should NEVER identify herself as a Doctor when flying in the states, even though her danish license is reciprically recognized by almost all countries in the world. She is not licenced in the states, and furthermore her malpractice insurance would not cover such a situation. Even if she has equal (or better) training than a peer in the states and indeed a moral obligation to help in life threathing situations, I tend to agree with her professor-- kind of sickening, but thats how it is.