Gaucho99,
If Parker elects to not pursue a Northwest merger due to resistance by Doug Steenland, it would not surprise me to see US Airways pursue United. Parker is not concerned about trying to acquire a larger carrier, Parker is young/ energetic and has a passion to merge, and some people believe Gleen Tilton is trying to sell the Chicago-based airline.
I do agree with you that United would be a distant second choice because their formal reorganization is complete. A combined US Airways-United corporate combination would likely have less total annual synergies than US Airways-Northwest because (as you know) there would be less financial flexibility and less ability to reject excess leases.
Regards,
USA320Pilot