I feel a jail term is probably a bit extreme in a situation like this, however I do agree that arrest, prosecution and a substantial fine for the theft of the item and the interfering with safety equipment of an aeroplane charge should be automatic as this will result in a person ending up with a criminal record (unless they already have one for any previous offences!;)), which will not look good if/when said person is applying for any new position/job in the future.