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In the documents detailing the scheme, Amazon said the combination of drones and flying warehouses, or "airborne fulfilment centres", would deliver goods much more quickly than those stationed at its ground-based warehouses.
Also, it said, the drones descending from the AFCs - which would cruise and hover at altitudes up to 45,000ft (14,000m) - would use almost no power as they glided down to make deliveries. Amazon Files Patent for Airborne Warehouses [bbc.co.uk]