Bit of a travelling salesman problem, but I think a hybrid approach would be optimal. Have the delivery van drive to a neighborhood, then release drones from the van to deliver packages to individual houses.

Now instead of just one truck for a whole route of deliveries, or one noisy drone per individual delivery, we get multiple particular corners in any given area where the sound is concentrated like a buzzsaw testing facility every day because that's where the Amazon dudes like to park and release the drones.

It'll be awesome when they decide that the parking spot in front of my house -- with no trees or overhead lines -- is an ideal place for drone staging.

(And no, I'm not particularly worried about any of these noise issues. I predict that it'll all sort itself out just fine. Besides, I personally think the spectacle of a swarm of package delivery drones leaping forth from a truck is something that I would never tire of observing.

But it is fun to think about the problems and the solutions. The deeper one dives, the more complex they get.)