Small planes

Why do they make planes so small inside where you sit? Wouldn't people like to fly more if they were more roomy?

No pizza on planes

Wouldn't airlines make a fortune if they sell the top fast food, pizza on planes? How come they don't do it?

Fast food on planes

How come fast food chains don't sell their food on planes? Wouldn't they make a lot of money?

Airplane seats

If the airplane seats are tight, how come they don't make them bigger?