Delivery drones

I am very exited about the upcoming trains in Captain of Industry. Delivery drones could be a further logistics option for late-game. I imagine small truck sized quadcopters, delivering small cargo quantities from one drone port to another (somewhat similar to Satisfactory). Drone ports could be buildings like early game storage, with one or four drone landing spots on the roof. Drones would start in a vertical line, fly fast to the target drone port, and decent again in a vertical line. After each trip they would need a recharging time dependent on the distance travelled. The drones could either be built in a separate drone factory or for less complexity directly in the drone port with a similar interface as the ship designer in the shipyard (for ship upgrades). They would need advanced resources, maybe even battery cells from a lithium production chain (as suggested in Power options and changes).

Possibly end game logistics tier with perpetual enhancement possibility (battery capacity, payload, speed).
- Small drones: short distance, fast, single-item moving, lands on any building
- Medium drones: farther distance, 1-5 items moved, recharging stations needed
- Large drones: Long distance, 10+ items moved, slow moving, landing platforms for loading/unloading required.
- XL Drone/Airships/Zeppelins for island trade alternative to Cargo Ships?