Just been listening to a news article on the radio. A person speaking in the article said that she went to the bathroom on an aeroplane. I don't know about anyone else, but I've never been on an aeroplane that has a bathroom. Oh, I've just realised - she meant the toilet! Just another Americanism that drifts into our way of speaking. Like the "holidays" instead of Christmas. A minor irritant, but one none the less. Also, please note that I wrote aeroplane, not airplane. Have a nice day!
Restroom usually means toilets in a public area such as a train station. Correct me if I'm wrong, but I've never known British people to say bathroom for toilet. It's no big deal, just my observations.