But the fine print seems to say that they would stop you in principle, that is, if they knew about it and had enough resources to actually care. I'm not saying

But the fine print seems to say that they would stop you in principle, that is, if they knew about it and had enough resources to actually care. I'm not saying that they would...it's the principle itself that rubs me the wrong way. As a practical matter, I actually prefer that they check my passport before an international flight, just as a last reminder. Certainly wouldn't want to fly all the way to Japan thinking that I had my passport, then, whoops!