Amazon has been granted on a patent on what it is calling an “airborne fulfillment center,” an aircraft that appears to be a giant mothership for retail products and the company’s new drone delivery system.The patent, which was granted in April, calls for “a floating command center delivering goods from eight and a half miles above the ground.” Orders could be received and delivered from the command center within minutes.Amazon's filing explains that the blimp would remain in the air and be refueled and replenished using a shuttle.