The trouble, Dark Night, is that when terrestrial automated transport experiences a fault, it fails gracefully and stops on the road. Even a ship can often anchor.
Aircraft don't have that characteristic when they fail.
Furthermore, there is the little question of authority and responsibility in the event of an accident.
I would prefer that a knowledgeable person, who is going to die along with the passengers if anything goes wrong, supervises the despatch and conduct of the flight. I prefer this because of the phenomenon of
diffusion of responsibility will preclude a court attaching blame to criminally negligent individuals associated with the despatch of said aircraft.
In risk-taking literature, diffusion of responsibility occurs when individual members of a group feel less personal responsibility for potential failure in the pursuit of risky options than if acting alone.
Diffusion of responsibility - Wikipedia, the free encyclopedia
I suppose we could solve that problem by fitting the engineers, despatchers and operations managers of said unmanned flights with explosive collars that would be automatically triggered by the aircrafts demise.