And bare feet are not OK either. American Airlines' code of carriage does not specify what is not allowed, but it does say that passengers have to "dress appropriately; bare feet or offensive ...

Getty Images American Airlines’ code of carriage does not specify what is not allowed, but it does say that passengers have to “dress appropriately; bare feet or offensive clothing aren’t ...

Most airlines have some form of a dress code on the books, though they generally tend to keep things vague: American Airlines: Passengers must “dress appropriately,” avoiding “bare feet or ...