Originally Posted by steveholt

What an enticing subject, I know!

I was flying DL ATL-JAX in Y towards the front of the cabin yesterday and saw something that raised a question for me. With the first-class lavatory occupied, a passenger in F got up and immediately walked past the curtain to the bathroom at the front of the coach cabin and used the lavatory nominally assigned to coach.

Of course, it's not kosher for a lowly Y passenger to walk through the curtain and use the lavatory in first. But is it any more appropriate for a F passenger to do the opposite?