Unlike the May numbers from Channel Advisor, Wulfraat just looked at the 20 largest U.S. cities"”which are arguably the best candidates for same-day delivery, since they have the highest customer density. Then he measured the distance from each city's epicenter to the closest Amazon warehouse, figuring a generous 100 miles for a DC to be able to do same-day delivery. The results weren't generous to Amazon's same-day plans: Only eight of the 20 cities currently have an Amazon DC within 100 miles.
