I'm not doubting you, but I'm still not convinced. They'll have to restrict drone delivery to a limited number of areas or they'd need new distribution centres everywhere to allow for the short range of the drones. Shipping the parcels to a local distribution centre would surely take most of the time so it's difficult to see how much you'd gain over the standard next-day delivery. I'd love to see the business case for this - I just can't see how you could justify it other than as a marketing gimmick. One drone, one (small) parcel. One van, tens/hundreds of parcels including very large, heavy ones.