From a different perspective, if a person is unable to remain seated for an hour, and cannot exercise the common sense to use the bathroom in the airport before boarding, then should they really be out unattended? The airline I worked for (until very recently) uses 19 seat turboprops with no lavs on trips of up to 2 hours in length. Passengers are advised of this ahead of time and we very rarely have problems. If you drink 6 cups of coffee before the flight and have a bladder the size of a thimble, then you will probably get what you earned.