On December 7, 2016, a drone departed from an Amazon warehouse in the United Kingdom, ascended to an altitude of four hundred feet, and flew to a nearby farm. There it glided down to the front lawn and released from its clutches a small box containing an Amazon streaming device and a bag of popcorn. This was the first successful flight of Prime Air, Amazon’s drone delivery program. If instituted as a regular service, it would slash the costs of “last-mile delivery,” the shortest and most expensive leg of a package’s journey from warehouse to doorstep. Drones don’t get into fender benders, don’t hit rush-hour traffic, and don’t need humans to accompany them, all of which, Amazon says, could enable it to offer thirty-minute delivery for up to 90 percent of domestic shipments while also reducing carbon emissions. After years of testing, Amazon wrote to the Federal Aviation Administration last summer to ask for permission to conduct limited commercial deliveries with its drones, attaching this diagram to show how the system would work. (Amazon insisted that we note that the diagram is not to scale.) Amazon is not the only company working toward such an automated future—UPS, FedEx, Uber, and Google’s parent company, Alphabet, have similar programs—but its plans offer the most detailed vision of what seems to be an impending reality, one in which parcel-toting drones are a constant presence in the sky, doing much more than just delivering popcorn.