Pay Rate Question

Hey everyone I'm in the central region and just started cover/air driving after being part time for about 9 years. My current pay rate is right around $16 when I work in the hub or cover drive but only $12.50 when I air drive, is this right? I've barely worked full day coverage but have been working a lot of Saturdays at $12.50 and covering a pm air route at that same wage. The contract is confusing and I am not sure if I should be making at least my inside rate when I air drive until progression catches up or not. Thanks for your help.
 
Top