Hmm, the loo, really.
Do you we ask friends and family before they get in the car if they have been to the loo? I did with the kids, but we are dealing with adults arent we? We will go fly for an hour or whatever I would have thought should do the trick. If they want the loo after 45 minutes they can wet themselves as far as I am concerned.
Still I guess nothing should surprise us these days.
As my friend's Mum said to the kids as they got out the swimming pool, hurry up its raining, you are going to get wet.