12 and 13 go hand in hand. 12 also mentions children may exceed the number of seats provided and just re-enforces the same point. It specifically says that 1 extra person than seats available may be carried if that person is a child. There is even a CASA rule making about it called "CASA ruling 2/2004". There is no doubt about what CASA says about it. The only question is what RAAus say about it and I think they say very little.