You are greatly overestimating the efficacy of your union reps, as well as the communication chain between them, Compass management, and finally down to Cpz line pilots. IF Compass management actually received a complaint about PA's referring to "Delta" not followed by the (willfully deceptive) addendum "Connection", they wouldn't care. And if they cared, they would take so long to communicate (if they remembered at all) a reproach to the offending crews that the force of the point would be lost. The same, I'm afraid to say, would be likely be true if this complaint would be carried through strictly Union channels.