There may be a "back door" if you look into it. At my center we were told that for bidding purposes anyone on the feeder coverage list was considered in the feeder classification, so they'd get first crack at signing a bid sheet for an open permanent feeder position. There were a couple FT drivers who were on the coverage list, but they dropped off so now the most senior guy on the list is a part time sorter. It hasn't happened yet, but from what we were told he could jump directly from part time insider to full time feeder without a year of UPS safe driving.