Amazon company already begun experimental use of unmanned aerial vehicles for express delivery of small goods, actively expanding corporate fleet of cargo aircraft. However, in their wildest dreams the American Internet giant is ready to develop the warehouse infrastructure even in the air!
At least two years ago filed a patent application describes the use of "air curtain" for the accumulation and transfer of goods delivered to customers of the aircraft. To take off from the ground drones need to spend more energy than for a smooth descent the load on the ground. Replenish the stock will be other aircraft - small planes or "shuttles" special design. This "air storage" will hover at an altitude of over 13 km. Apparently, the support structure is in the air will be filled with a light gas reservoirs.