There are many accessible planes out there . The improvement in the airline companies is very slow, before a handicapped person travels he need to ask a lot of questions about the whole procedure of the flight. Who is going to board him? From where etc.
About the toilet it is not that simple I found this article that says:
"If disabled passengers find themselves on one of the smaller planes that does not have an accessible lavatory, they may be required by the airline to be catheterized."
