Interesting, I am woefully ignorant on typical drone ranges.

Now I’m imagining a larger, fixed-wing loitering drone carrying the package(s) and a small last-mile drone that detaches, drops its payload at the destination and then returns to the mothership.

There should be even larger drones that are always in the air that are used as supply hubs for these smaller drones. Actually those should be whole warehouses where people work.

Why not a zeppelin?

(The prospect of delivery drones is silly, but whatever it is fun to think about).

Winner. Battery capacity needs to double and charge twice as fast to make EV adoption possible.

Swappable batteries makes the charge time a nonissue.

Swappable 1000lb batteries? Gasoline weighs 80lbs.