There was a short (1h) flight somewhere out East I think where AC asked pax if they wanted to take the flight without the one available washroom being available, or they could change for free onto a later flight. I believe [MENTION=599574]canadiancow[/MENTION] posted about it a while ago, possibly EYW related?

Of course, major difference between a 1h Q400 flight and a ~8h TATL one. Wouldn't surprise me if there was a minimum requirement for longer flights, what the official ratio has to be however I'm not familiar with. I do know people who have flown on planes where half the J washrooms became unavailable due to overflowing though (not AC, surprisingly). Point is, the number of washrooms that are functional at the start of a flight doesn't always equal the number available at the end.

I too enjoy 31J for the legroom and also easy access when I do need to pop-in even if the pilot has forgotten to turn off the light. But being stuck there for a 7h TATL with all washrooms available vs a slightly longer flight with half of the Y lavs out of order ... shudder.

Also, left vs right can have different meanings depending upon which way you are facing