Amazon, the world's largest online retailer, is testing unmanned drones to deliver goods to customers, Chief Executive Jeff Bezos says.
The drones, called Octocopters, could deliver packages weighing up to 2.3kg to customers within 30 minutes of them placing the order, he said.
However, he added that it could take up to five years for the service to start.
The US Federal Aviation Administration is yet to approve the use of unmanned drones for civilian purposes.
"I know this looks like science fiction, but it's not," Mr Bezos told CBS television's 60 Minutes programme.