In the world of social media sometimes it’s better to pick up the actual book and find the answer yourself. Read your contract book
There are 10's of thousands of Teamsters who get 30.64 an hour to load trucks in buildings. They do all kinds of stuff. It all started in 1997 when Ron Carey started to two tier wage for full timers. The 22.2 kept the top rate until Ron changed it up.
(f.) Employees who are in existing full-time combination jobs or who hereafter enter a full-time combination job shall be paid the appropriate full-time air rate for air driver work and appropriate inside part-time rate for the hours worked in other classifications. If an employee has no established inside rate, that employee will be paid the appropriate part-time rate in accordance with his Company seniority
Air driver combo jobs are paid at different rates. You follow full time progression for the driving part of your job, but are paid your part time rate for hub work. When you reach your full time progression your driving rate will increase to max, but your hub rate increases with your yearly raise.