They order and pay over the Internet and the books are shipped through the mail or a delivery service like FedEx.

One day, people could get their Amazon deliveries from an "unmanned aerial vehicle" -- a tiny flying vehicle that looks like a toy helicopter.

And instead of waiting days to get the parcel, it could be at the buyer's home in half an hour or less.

The company is working on a fleet of tiny vehicles they call "Prime Air."

The vehicles are also known as "octocopters."

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