-US still flies completely separate fleets than HP as they butchered the US-HP merger.
-AA and US both have almost zero presence internationally, save for AA in Latin America. They add almost nothing to each other. (DL/NW and CO/UA both added a lot internationally for each other)
-US has many good opportunities for *A accumulation and a very good award chart that will go away when they become AA in OW.
-US will likely stop flying to TLV if they become AA due to pension issues from TWA.
What are you looking forward to exactly?