Alsacienne, I think that
Sobelena's point was in answer to the post by
scr1:
Have seen parents book their child as a adult so they can get the emergency exit
No, I don't think that a 12 year old is a good idea next to an emergency exit, however, I honestly don't think that parents deliberately book a child as an adult. The point is that from the age of 12 they are charged adult fares!