[Polylactic_acid]

People also predicted 2000 would have flying cars. The moral of the story is future prediction is very difficult and often inaccurate for things we are not close to achieving. Not that they always come sooner than predicted.

[api]

We have flying cars. What we don't have is a flying car that is ready for mass adoption. The biggest problem is high cost both for the car and its energy requirements, followed by safety and the huge air traffic control problem they would create.