Representatives of Amazon and the Postal Service said the Seattle-based company was taking advantage of a little-known offering available to any shipper. So it

Representatives of Amazon and the Postal Service said the Seattle-based company was taking advantage of a little-known offering available to any shipper. So it sounds like they're just using Express mail.. not really anything special. USPS will deliver express mail on Sunday for an extra fee ($12.50). I'm in Denver, you can drop off an express mail package @ the post office in stapleton until 10pm on Saturday, and it will be delivered on Sunday by 3pm. That facility used to be open 24hrs a day/7 days a week.. so it wouldn't surprise me if the cities amazon picked have facilities open for 24hrs, and they are able to drop off packages at 2-3am sunday, and still have them delivered on sunday (within the city, or near it).