NEW YORK: Amazon is giving new details on its Prime Air drone delivery programme. But the timeline is still unclear. The retailer says Prime Air will one day deliver packages up to 5 pounds in 30 minutes or less using small drones. The drones will fly under 400 feet and weigh less than 55 pounds, according to details posted on its website Sunday. It says it will use technology and automation to operate safely. Seattle-based Amazon.com Inc. said Monday the programme will start once government regulations are in place to support it. It has development centres in the US, the UK and Israel. The Federal Aviation Administration (FAA) currently bans commercial drone flights but has granted several thousand waivers. It has granted Amazon approval to fly drones for research.