Amazon has patented the idea to use giant flouting warehouses to deliver packages via drone. It's unclear at this time if this is just more patent trolling by a big corporation or if Amazon is actually going to invest resources in the idea.
Personally I feel that Patents have gotten way out of wack. The original intent of patents was to protect inventors ageist big corporations. Now patent laws protect big corporations against inventors. It seems to me that Amazon should need to actually build this Airship before they can be granted a patent on it.
