I have a OWE and just tried to remove a segment (change to surface). The segment is ORD-DFW before flying same day on to SYD. I am being told that I can't remove the ORD-DFW segment because it is married with the DFW-SYD segment. But I didn't ask for those segments to be married. Now I have no choice (according to AA) but to take the ORD-DFW flight which is about as inconvenient as it can be. Where did I go wrong in booking this ticket (or where did AA go wrong)? I want to make sure I don't get a repetition of this for future bookings. And if you have any hints on how to get out of this predicament now, I would appreciate it.