Our new agreement is not an exit from 4a2b. Rather, it is (assuming that I Understand it correctly) a way to get our union SIG (Scheduling improveent Group) involved in building our lines again. When line values dropped below our contractual bid line guarantee due to 4a2b, the decision was made not to have the union involved.
There is a separate grievance currently in arbitration concerning the illegal application of contract section 4a2b.