Here is the new terminal at Raleigh-Durham. Like almost all other terminals and all new ones its ceiling is three or four stories high. Why? They are all like this. For some it extends inside but usually not. But when you enter a terminal, invariably it is a large open vertical and horizontal space. Surely it costs a ton more to build and operate. And none of the vertical space is put to use.
What set of circumstances led to what is clearly a world-wide equilibrium?