Do you realize that with your way of thinking, a company would NEVER add any new employees if they were allowed to do what you seem to think is ok for them to do. The company strategy would be that every time they get busy, they'd bring in some non-employees for a month or so to get caught up, then once caught up, send them packing. How would the seniority board ever grow doing that? It wouldn't. And if you are a newer employee, you would have never been put on the board. At best, you'd be one of those nons that get to come and play for a month, then you'd be sent packing.