I think that most aiprlane bathrooms do, you just sort of have to look for it, it isn't that obvious. Many of the forward bathrooms have them that come down "long ways" rather than "sideways," if that makes any sense, so at first glance you may not notice it.
Here's a tip. I saw a "joke" internet site one time about changing diapers on the plane, and one of the things it suggested was to unfold the diaper before hand, so it is ready to go, then put it on top of your head. Well, I knew to have the diaper open and ready, but the first time I changed on a plane I realized that I had no idea where to put that open diaper, and I put it on my head. Those bathrooms are smal and the table is small, and with it down there is no place to put it. Actually, it works great. I know it sounds stupid. My child just laughed and laughed and that made everything easier, and it was at an easy place to get when the time came. So I now recommend the top of head head diaper store method.