PTers: The current TWU CBA contains the 1:1 language after certain numbers are met. In the case of MIA, let's assume our numbers are 1500 FT and 500 PT. That would mean that any number above 1500 would mean they can add the equivalent number of PTers, or 1600 and 600.
OK. So if we had 1800 FTers in MIA, it means they could add an additional 300 PTers. In order to make that more difficult for them to do we use our OT language to dissuade their use of more PT. They would need to hold all the FTers on OT before they could hold or extend a PTer. That has been a successful mechanism in order to control the proliferation of PT despite their contractual ability to raise their numbers.
The IAM has a different philosophy and culture with the PTers and the OT language may not mean a great deal. To the TWU side, having PTers held rather than FTers and having 3-hour shifts really puts the pressure on tamping down the PT numbers even if we keep our current language, nevermind if we go to a 40% number.
2X: We've had double-time before and in a station like MIA that may be an overall detriment rather than a plus. Obviously, if you get the double-time it would be good but they will clamp down on the ability to get it consistently. A benefit to having the 1.5x is that we get OT in the 6 to 8 range after your shift. Many people like that because they can get their OT in one day rather than stay multiple days. We'll take the 2x but it isn't a huge deal and some will argue it is a detriment especially with PTers taking some of that away. It is probable that some will have the earnings actually go down because the pool for the OT will increase.
In MIA, we have hundreds of hours of OT a day, but usually less than 100 PT extended hours per month. That will change drastically.
Grievance: Right now, the process we use is better suited to getting quicker results. In the future, the compromise means two added layers to the process and slows down the results and bogs down the machinery. If you have a disciplinary letter and it takes a couple of months to process waiting an extra couple of months is unneeded stress.
CS: Those in the know agree having contractual language is usually better than not, but when the policy in place has been pretty consistent over the years, except for a few hiccups, it makes that transition more worrisome. I don't think the change is too bad, but any change that places restrictions is seen as a negative.
In the IAM world, all this may seem perfectly reasonable but the TWU has had different systems, philosophies, and cultures.