Drone makers race to build quieter, stealthier aircraft as deliveries spread

As drone deliveries become increasingly common, manufacturers are seeking ways to reduce the noise these aircraft produce. The buzzing sound of drones has become a source of annoyance for people living near delivery routes. Companies are therefore searching for design and technical solutions that would make the machines less audible. The push for quieter drones reflects a broader effort to make the technology more acceptable as it expands into everyday use.