AA flies to DUS from ORD and will open up award inventory on their own planes for significant schedule changes (there's a thread dedicated to the schedule change topic). It looks like flying from PDX to ORD is going to involve 2 hops rather than 1 on a weekend, but if you can do a weekday then you can eventually end up with PDX/ORD/DUS on AA (might need some persistence and/or a few call attempts, though the opening of award space is something the phone agent would need to ask the help desk to do).