>Drone delivery only to sustain a megalopolis would likely fill the air with background sound not unlike an army of barking dogs. No, barking dogs would be far

>Drone delivery only to sustain a megalopolis would likely fill the air with background sound not unlike an army of barking dogs. No, barking dogs would be far worse. Drones are just a constant buzz or whir, so they're basically white noise, though the noise gradually changes in pitch and volume as the drones move around due to distance and doppler effect. Dog barking is sharp and irregular. Sane humans find that far, far more annoying. Having smaller deliveries by drone could be quiet and nice if they invent anti-gravity systems (or "suspensors"). But that probably won't come until after we have ornithopters...