Just to clarify, it appears this has nothing to do with negotiations. UPS has unilaterally decided to make that holiday a full ground operation day. It has ALWAYS been an operating day, but it has in the past been an air only special operating day. So, in a center with say 60 daily routes, you would see around 15-20 routes sent out with air deliveries only and air pickups for UPS stores, letter boxes, and special requests. The top seniority drivers would be offered the 15-20 spots, then the bottom seniority would be forced in to fill whatever was not met. Those who came in would get whatever working holiday rate is in their supplement, plus the day of holiday pay that everyone gets. Now, UPS is saying it will be a full operating special operating day. All the same rule apply except that the number needed will be closer to the full 60.
Good news for the lower senior guys who wanted the extra work in centers where higher senior drivers usually come in, bad news for the middle seniority guys who do not want the work in other centers.