Walmart plans to bring drone delivery service to 4 million US households

Company says service will be rolled out in six states and could receive more than 1m packages by drone annually

As many as 4m American households will be able to get food, groceries and supplies from Walmart delivered by flying, remote-controlled drones by the end of the year, according to the retail chain.

Walmart announced that its delivery service with the operator DroneUp will be rolled out in six states, making it the country's first large-scale drone delivery program.