^ Near as I can figure, this is all because the international terminal (Terminal 5) is so far from the rest of the airport. WHY this is so, I have no idea. 
https://en.wikipedia.org/wiki/O'Hare_International_Airport#Terminals
specifically:
Supposedly they're working on it, but...hell, you know how bureaucracy can be.

https://en.wikipedia.org/wiki/O'Hare_International_Airport#Terminals
specifically:
Wikipedia said:Terminal 5 is separated from the other terminals by a set of taxiways that cross over the airport's access road, requiring passengers to exit security, ride the Airport Transit System, and then re-clear security before boarding.
Supposedly they're working on it, but...hell, you know how bureaucracy can be.

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