Had we both been ALPA, this integration would have gone to an arbitrator (which I believe is the only fair way to do it.) It's anyone's guess as to how it would've gone, but I can guarantee this - there would have been no stapling. There is never any stapling when an arbitrator is involved, rightfully so.
Unfortunately, when two different unions are involved, the acquiring carrier and its unions are free to do what they want. In many cases fairness is thrown out the window. (SWA/Morris, AA/TWA, SWA/Muse/TranStar, AA/Reno.) However, there are a few ALPA-ALPA mergers where merger policy is tossed out, and the integration is a result of a "back door" type deal between the acquiring MEC and management. (TWA/OZ - yes, DOH, but still an 80% staple and ALPA meger policy not followed, Piedmont/Empire - full staple.)
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Mergers student!