At least we have something to get erased. A union shop has a legally enforceable contract that can be brought to court for dispute resolution if other methods fail. With a 'handbook' or policy manual, there is no legal channel you can take except stomping your feet. If things got real bad, your only recourse would be to find individual pilots who were harmed, get them to sue and then take that lawsuit and elect it as a class action. Oh and of course pass a hat around to pay for legal fees. After all, a management funded SAPA surely will not litigate against the company.