I assumed since I was part of a union that management would be offered based on seniority. But I've been at UPS for just shy of two years now and I've watched multiple people that have been here less than a year become supervisors before me. I've told the boss that I plan to stick around for years and that I'd like a supervisor position, but he just seems to ignore that. So if it's not offered based on seniority, then how does one obtain a supervisor position?