I remember the pulp Science Fiction magazines of the 30's, 40's and 50's. Quite often they had drawn pictures of cities with hundreds of planes going every whi

I remember the pulp Science Fiction magazines of the 30's, 40's and 50's. Quite often they had drawn pictures of cities with hundreds of planes going every which way. For a while it was autogyros, helicopters etc. It never happened. Cars won. A car is supported by the road with zero energy cost except for motion. Any aircraft must waste energy at all times, and the highest energy use is when standing still(hovering). Ok so they have 100,000 planes flying around LA at 200 miles per hour. Managing that number of planes under automatic computer control is a huge technical challenge. Human pilots = impossible. Until we have anti g and can hover for zero energy it will never happen.