My story ; started in the 70's P/T @ $ 7.50 , made top rate $9.00 within the first year.
Not every contract came with wage increases, sometimes all monies went directly into Health & Welfare during the 80's. In order to get people to vote correctly the company started the bonus program , $1,000 for friend/T & $500 for P/T instead of yearly increases.
In the late 80's I became an air driver , $10/hr.
Only for one contract did I get a raise $1.66/hr while new air drivers started at $13.50 . I stayed at $11.66 until taking a combo job ( year 1 ) , which jumped my pay up to my inside rate.
Up to 2003 I did inside/outside work, I switched for one bid to another building still getting my top rate ( inside/inside ).
I switched back to my old building on the next yearly bid. ( in our system seniority stay with you no matter what classification you bid into ).
There was a change within the contract that no longer gave me one rate for all jobs, I was forced to drop $5.00/hr whenever I drove .
And when I finally was able to move inside/inside some how I lost my old P/T rate and lost $200 / wk , they only currently pay me for inside work at the top airdriver going rate.