Of course, the reason not everyone's not on board is because they view the plan as not aggressive enough, and if it's aggressive enough, it probably means you're not going to look it. That is to say "everyone but the three unions on the committee" is interested in increasing the value of their claim, and that "requires" talking consolidation.
Or maybe it would be sufficient if Horton let discussions of a merger drive the debt up, as Parker did for DAL, and they can sell the debt to some other suckers, and then there can be a serious discussion about to actually have AMR function as an airline.