Sorry to be jumping into this on Day 3, but I too find all this talk of mergers to be overly optimistic in light of $80 oil and the thought of Hamas possibly having a voice at the UN...
What makes you think the China rights are even saleable, given the significant US Government policy considerations involved?
Stranger things have happened under faltering carrier guidelines, but as long as you're dealing with carriers who are already approved for rights to China, it would be possible for route authorities to be transferrable under faltering carrier guidelines, but whether or not DOT would do that is another question. It was already determined after the PA/UA deal in 1987 that beyond-rights for NWA and UAL at NRT couldn't be transferred to anyone except the corporate successor to those companies.
Of the partners and combinations mentioned, I don't see AMR merging with another large carrier at all. Alaska, Aloha or Hawaiian? Maybe. But DL, CO or NW? Unlikely under any reasonable circumstances.
AMR already flies between 15 and 20% of domestic RPM's by US carriers (the data up above backs that up), so first of all, there's not much to be gained with a merger, and second, it's unlikely that anyone at DOJ or DOT would want to put any more eggs in one basket so to speak.
Equipment wise, it would be more advantageous for AMR to wait to see what happens with DL, and how quickly they move to affirm or reject leases with lessors.
If DL winds up a merger partner with anyone else but AMR, there's a fleet mismatch which potentially puts DL's relatively small fleet of Trent powered 777's on the market. Likewise, a merger with anyone except CO or WN (even less of a possibility than an AA/DL merger) potentially creates an orphan 738 fleet.
Another potential outcome is for DAL to reject their 777 leases now. There is really only one destination in their system which requires the 777 -- NRT.
(Un)Fortunately, the dismemberment and merger of the competition usually winds up to be pipe dreams. But it's still some useful speculation for a slow news week...