Originally Posted by B-HQC
In my experience on most airlines FAs seem to disallow passangers to tresspass into a higher class cabin, but always have no problem with passangers tresspassing into a lower class cabin.
I definitely agree with this, and most of the time the announcement usually focuses on "reminding" the coach passengers to use the bathrooms in their cabin but there is relatively little emphasis on telling the J/F passengers to stay in their cabin.
On the three class (i.e. 762 and 777) everytime I have been on one the purser generally makes an extra special emphasis on making sure to tell the J cabin that the F lavatories are ONLY for the F passengers.