Amazon has said it will use drones to deliver packages to customers "within months".

By Dave LeeNorth America technology reporter(BBC)

It unveiled its latest iteration at a conference in Las Vegas, touting the machine's ability to spot obstacles such as people, dogs, and clotheslines.

Amazon executive Jeff Wilke said the drone would be able to travel 15 miles to carry packages weighing 5lbs (2.3kg) or less.

Mr Wilke did not say where in the world the drone deliveries would initially take place, or precisely when.

However, the US Federal Aviation Administration told the BBC it had granted Amazon a permit to operate the drone in the US.

"The FAA issued a Special Airworthiness Certificate to Amazon Prime Air allowing the company to operate its MK27 unmanned aircraft for research and development and crew training in authorized flight areas," the regulator said.

"Amazon Prime Air plans to use the aircraft to establish a package delivery operation in the United States. This certificate is valid for one year and is eligible for renewal."

Required: Discuss three non-financial (qualitative) factors that Amazon would have to consider before using drones in the UK.