Originally Posted by
cooper99
Be careful with the US passport mate...when lost the new one has a new number and the old one is flagged/cancelled...could get you in a mess using it.
Only if there's intent to fraud. Expired passports are an acceptable form of ID in the US for the very purpose of obtaining a new passport. So using it at a security c/p isn't materially any different, is it?
But maybe you can give examples of messes one could inadvertently fall into that haven't occurred to me. Seriously, you've piqued my curiosity.