All new PT hires are guaranteed $16.65 after they pass their probationary period and join the union. That's when the Cost of Living Adjustment kicks in. $16.65 is the contract wage of $15.50 + .82 COLA + .33 COLA = $16.65. And a four year seniority PT doesn't make more than a 30 day seniority PT. It's all the same in the current contract.
It's not just your region, they're hiring at $16.20 (or more) everywhere.
Sorry, but it's already happening. UPS is and has been at $20+ at dozens of hubs. In some cities, package handlers are starting at $22, $23, $24. Sorry to all the teamsters who were cheated for so long.