I'm not sure that you work for MTC, or you're just trying to stir the pot. If you were, you would know that none of the GMR aviation companies has a union. You would also know that the OPEIU has attempted to unionize the companies several times without success.
All of the GMR aviation companies have the same pay scale. The pilots pay was increased by over 10% this last year to bring it higher than most of the industry. REACH does pay more for the bases in Californi, because of the California pay rules.
You should also know that the OPEIU made a mess at AMC and PHI.
Do your homework and see what the union can really guarantee you beyond having to pay union dues.