Amazon isn't the only U.S. company investigating the use of delivery drones. The Postal Service is, too, and they've just shortlisted this 8-rotor carbon fiber beast as full of potential for future post deliveries. It's called the HorseFly.
Just like in the real world, you'll find these HorseFlies buzzing around a horse — a WorkHorse to be specific, which is what they're calling the vans that serve as mobile bases for these massive drones. It'll serve as a sort of aircraft carrier for the drones as they perform their drop-offs. A HorseFly scans a parcel, uses GPS to determine the shortest flight path to its destination, and then efficiently makes its delivery and returns to the WorkHorse to repeat the process.