Just finished 200 IOE out of ORD. Good times (temps were -18 on the ramp and colder than that in FSD). All I have to say is, whatever you do, avoid the AA flying out of ORD like the plague. We sat on the 32R pad for 97 minutes because AA Ops couldn't be bothered to rustle up a ramp crew to park us. And yesterday we took a 3 hr delay because nobody could find a fuel truck. And when the truck did show, it drove up and then drove away without fueling us. Absolutely unbelievable. The UA side, fortunately, is far better.
The flying was just fine, but AA Ops..it's absolutely mind boggling to me. Avoid like the plague...