Yes, and I imagine it would be really difficult, for good reasons (mostly esthetical), to convince a city to install poles and cables for package delivery. At t

Yes, and I imagine it would be really difficult, for good reasons (mostly esthetical), to convince a city to install poles and cables for package delivery. At the same time, we've seen drone trials going on for some time, and the idea of having expensive, autonomous flying machines, on a very limited battery life, carrying weights over our heads and delivering them possibly without even landing but just hovering and lowering a winch, well it seems pretty implausible. A Google wing drone probably costs a few thousands, can deliver two cups of coffee on range of about 1.5km, in extremely controlled conditions, for 100 suburban homes. And has already pissed off people in the neighborhood. Imagine how it would work inside a city center, and how it would scale. And how would you adapt it to homes and buildings that have no garden and no roof terrace?