Amazon files patent for flying warehouse

Amazon has filed a patent for massive flying warehouses equipped with fleets of drones that deliver goods to key locations. Carried by an airship, the warehouses would visit places Amazon expects demand for certain goods to boom. It says one use could be near sporting events or festivals where they would sell food or souvenirs to spectators. The patent also envisages a series of support vehicles that would be used to restock the flying structures. The filing significantly expands on Amazon's plans to use drones to make deliveries. Earlier this month it made the first commercial delivery using a drone via a test scheme running in Cambridge.