It depends. If they're bringing in new execs who are experts at dealing with this sort of thing, it would be hard to ask them to make "concessions" for the sake of the company, since they could just go somewhere else. The reason the airlines can (and have to) ask the unions for concessions is that the unions have artificially inflated wages above market levels.
Just curious what you think of the Boeing machinists who are on strike, not because of an economic or benefit package, but because of perceived disrespect paid to them by management. How far can management push employees until they strike or are employees just expected to take abuse from management?