You can fly car in GTA Vice City using a cheat code. However it will not affect the city. You can just see the city from a certain height. The same can be done by flying a helicopter or seaplane in the game. In real life, it may affect the cities in a positive way. Flying cars will lessen the load on roads and there will be less traffic and road accidents.
If the question is related to GTA Vice City then you can use cheat comeflywithme to fly car for short distances.
On the other hand.
if there is a futuristic approach to your question:
It depends on how flying car in future will fly. If they will still use the same fuel then it will be bad.
We are looking forward to control pollution in our cities and the best thing is if the flying car use some anti gravity tech and some solar power to drive forward. This will be a revolutionary step towards daily transportation. We will have imaginary grid road system on the cars computers to drive at a certain level and avoid traffic. There are many advantages to that.
Different if there is a 2100 flying cars meal in a pill cities the clouds
are flying cars real
no china does not have flying cars
Flying cars will be invented the day flying pigs are :)
There are flying cars now. Google "Flying Cars".
There are flying cars but not available for the general public.
they might be selling flying cars in 2010
There are already flying cars. They are just not used in commonwealth.
There are several models iof "flying cars" available
Flying cars have been commercially available since the 50's.
Josh Leopold did in 3 November 2010
Flying cars have been a reality since the 1950. see link