I was told by a friend of mine that Europe charges for bathroom usage in flight. Either that or they once did or considered it. I was stunned when she said that because how could you charge for an essential on a flight? And what if they don't accept credit cards or you don't have the money? "Sorry, you have to hold it or make a mess in your seat"
if any of the above is true, i just hope this is one thing US carriers don't follow up on like they do with the other fees nowadays.