I just spent all morning walking all over Chicago O'Hare airport. 4, count 'em, FOUR gate changes. And not nice little "go down to the next gate" changes - I'm talking "walk the whole length of the terminal" gate changes.
At one of these gates, there were three flights scheduled to depart within half an hour of each other from the same gate.
Apparently the laws of space-time do not apply in Chicago...