A couple of years ago Amazon put out an idea of having large blimps flying around with inventory in them. Drones would then deploy from the "mother ship" with items and deliver them, then return to the blimp. As inventory decreased, smaller blimps would come and dock with the bigger one and restock it. I think it was about 2 years ago that I saw this scenario online somewhere, complete with a schematic diagram.
Jack
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