A contract item as defined by the NMB, is pay, work rules, filing of vacancies etc. Scope is not one of them, it's simply who is to be covered by that agreement. You can't strike over 76 jet flying at DCI, once you give it up, it's gone. The only way to put it back is to get management to volunteer it back. How do you plan to do that? Voting NO repeatedly on a contract isn't going to do that.