the delay in flying cars for the public will be the safety aspect of them.they are much more dangerous to control and cause more damage if in an accident.cars now are made to be the safest they have ever been but traffic fatalities are still high.so as soon as automated cars work properly then automated flying cars will be accepted.automated meaning we get in the vehicle and set the destination and a computer control's the route you take or corrects the route if it sees conflict or potential for an accident.get in say take me to work .sit back drink your coffee,get out it parks itself and locks up.after work press your fob and it pulls up to curb you get in and say bar .drops you off at your spot and drives you home after your drunk safely.exciting times ahead for our children.we may be gone by then