I would think that pay would be governed by your collective bargaining agreement (CBA). Assuming the pay scale listed here on APC is reflective of the current CBA, it shows that you should receive $23/hr for your first year. I'm not sure what the old amount was but I am willing to bet that the previous CBA had first year pay of $19/hr. It's possible that the letters showing $19/hr were left over form letters from the previous contract and accidentally slipped in with the more current $23/hr letters. It is also possible that ASA has a "training wage" negotiated into their CBA. Just some food for thought.