I think this is mostly about increasing drone payload capacity -- with payload, the drone only needs to "glide" downward to the correct location, and then the r

I think this is mostly about increasing drone payload capacity -- with payload, the drone only needs to "glide" downward to the correct location, and then the return trip is payload-free. The airborne distribution center and resupply ships are blimps or similar, and the items likely remain on the ground until ordered. Once ordered, they're sent on a supply ship to the airborne DC, and then glided down to the customer.