If you've flown out of O'Hare airport anytime within the last say 24 years you may have wondered this, when looking at directional signs, of "Why isn't there a terminal 4?"
I really used to love air travel. As a kid, I thrilled to the powering up of the engines, followed by massive acceleration leading to take off. I didn't even mind the turbulence, finding it to be more like an amusement park ride than something to be worried about...