They already have at least three whipsaw airlines - Piedmont, Commutair and Air Wisconsin are all on death row absent a new airframe.

They get offered new airframes contingent on a new deal- the union will say yes. The changes would mostly fall on new hires and/or FO's - therefore wouldn't affect voters much - and could be offset by some sort of signing bonus. Another tactic - probably workable as an LOA - is union approval of a training bond or something similar.

Then there's always Skywest.