An anonymous reader quotes a report from Bloomberg:Amazon didn't comment on the expansion plans, but has said its last-mile delivery efforts are meant to supplement, not replace, its long-time partners. "Our dedicated last-mile delivery network just delivered its 10 billionth package since launching over five years ago, and we're proud to provide a great service for our customers," an Amazon spokeswoman said."In just a few years, Amazon has built its own UPS," says Marc Wulfraat, president of the logistics consulting firm MWPVL International Inc., who estimates Amazon will deliver 67% of its own packages this year and increase that to 85%. "Amazon keeps spreading itself around the country, and as it does, its reliance on UPS will go away."