All good points. Sometimes its easy to get lost in the "fog of merge" and forget that management and the shareholders do not want a USAir East/West fallout (or in this case a North/South fallout). In addition to that, management does not want to operate seperate operations with seperate scope clauses that kick in penalties for parking 9's as well as any DL furloughs that would trigger 90 seaters (76 seaters with first class) becomming 70 seaters but keeping 90 seat operating costs.
NWA has some jurrasic whales they are going to park, but anything else would be 9's, which would ax management's Compass dreams. Delta only has a few 75's worth parking, and anything else would be MD-80's. NWA could furlogh a ton, and Delta could furlough up to 700 or so (before running into a contractual violation) but I don't see either case happening for reasons above. Management will also desperately want a lot more 90 and 100 seaters, and they have to go through the mainline pilot groups to get them, who will decide where they fly.