Right, and my question is, after presenting one ID on that list (my current valid driver's license) as required, if someone is asked for a "2nd ID", many/most of us simply wouldn't have a second item on the list with us. I happen to have more at home, but I don't carry them for domestic travel, and many travelers don't have a passport/GE at all. I'm not aware of any general requirement to carry more than one ID. So, had OP not happened to have a passport there, what would have happened? Would the agent have wanted to see other random info not on the list (credit cards etc), accepted the "No, I don't have anything else" answer and let him through, or what? I find it hard to believe that someone with a valid ID would just be denied boarding and sent home.