Actually, I suspect that US/HP might end up dropping international... except leisure carribean type work.

Assuming that DL kicks the bucket (yay), and NW, in severe distress, aligns or merges with AA, I can see the following:
AA/NW: the mega fleet of DC9/MD80... with hubs in DFW, ORD, DTW, MSP, LHR and NRT.
CO/UA: 777's of fun: SFO,LAX,EWR/JFK, DEN mini, IAH, CLE and IAD, NRT and LHR. CO takes DL's 777's and 764's and the newer 763s.
The entire A320 fleet/domestic UA 757 fleet becomes Ted's Song.