Self-flying air vehicles like this are probably easier to implement than cars. For simple reasons, such as there being no obstacles like roads, street lights, pedestrians, and because you have a 3rd dimension there is significantly more space so the vehicles can be more spread out. The trip itinerary is a lot easier because you're essentially going from point A to point B in a straight line. Also, starting from day one, you could mandate that no human is allowed to pilot these types of vehicles, so you wouldn't have a mix of human and computer pilots that you have with cars.