The last post left out one option.
If CoC is triggered, the union, at its option, can choose the language above or, can choose to extend the current contract for up to 3 years that would include a 4.5% raise per year. This option would include the 190's.
the 4.5% is on top of book rates for all except the 190. The 190 is 4.5% on top of current rates