I think UAL could be the sacrificial lamb to appease regulators in the next round of mergers. With DAL/NWA basically done, it's a virtual certainty something involving UAL is going to rear it's ugly head shortly. I don't think it's a matter of UAL's stand alone strengths, I think they just be thrown under the bus so that a few exec. teams can line their pockets with truckloads of cash.
Also, Alaska hasn't furloughed anybody since 1980. They've pissed everybody off since then but they've been kept on the payroll.
Ferlo, regulators will be concerned about lack of competition. I fail to see how the partitioning of a carrier among merged airlines would appease regulators. Carving up United would have the opposite effect.