The U.S. Court of Appeals for the Ninth Circuit issued a ruling today that a customer who paid US Airways $15 for a checked bag could sue the airline (and potentially certify a class action) for return of their $15 because their bag wasn’t delivered the same day. This case is now being argued by American Airlines, since US Airways and American merged three and a half years ago.
If an airline is going to promise timely delivery of a bag, and fails to do so, a customer can sue.