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Seems unpractical for some reasons:

1. Airships do need quite some maintenance. It's the main reason why there hasn't been a revival of them outside of the much cheaper low-tech blimps and hot air airships (basically steerable hot-air balloons) despite being safer than Airplanes when fueled with helium, which all modern Airships do. Hydrogen got only used because helium was very rare at the time, the US had a quasi-monopoly and didn't want to export it, resulting in the Hindenburg disaster.
2. You'd need to load and unload (to refuel the drones for instance) an entire airship, which will take quite some time
3. Could easily come into conflict with airspace regulation
4. Would most likely be grounded during heavy rain or storms or forced to stay above the clouds to avoid that weather. In any case, no delivery under such weather while it's still possible to do with a truck

That being said, I expect airships to slowly make a comeback, at least in short to medium range freight services. They can load absolutely massive amounts of freights nowadays (way more than even the biggest cargo planes) and don't need to unload the plane, load on a truck and unload that truck at the destination again as they can deliver directly to the client (if regulations allow it) or to remote places.