I work days, my cs partner works afternoons, he works for me on thanksgiving, I work for him on Christmas. No seniority violation just a CS double shift going on. The CS policy for ORD is on the ORD M&E web page.Interesting...Another example of how things differ station to station....We are not allowed to work a CS on a holiday! Let alone to get another holiday off with no reference to seniority.
If you don't have a cs policy, your local and your management are doing you a disservice.