You can't bump someone's primary assignment by seniority. Did any of those regulars request on 3971 for a day off? If yes, file a grievance for denied leave. If no, file a 3971 and start the process.Can anyone give me an answer to this situation? Carrier been out 9 months with surgery, the assigned sub runs the route since day one, she now gets a K day, Regular carriers want that day as their X day but are told that they can't have it because they need the subs to run the K day that PM assigned for the RCA's K day!Also, does the assigned sub run the route till Regular comes back or should the Senior sub be placed in that position?