The strike strategy is brilliant, imho. Targeting facilities that make parts needed by other plants will have a multiplicative impact on the employer without costing the union workers as much in lost income.

Then, looking ahead, I assume that even when they do eventually settle, the employer will need to pay the union workers to come back to work even if they have no parts to assemble. This puts more pressure on the employer to negotiate and bring employee compensation back in line with recent profits.