with all the technology developed in recent years...why hasnt any car company come out with a jetson model??

I'm waiting for Flintstone model

The way people drive on the ground is proof enough why they shouldn't.

They have!
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.jetsonaero.com/&ved=2ahUKEwjdtqDjwr79AhV9TDABHbrGDXcQFnoECAgQAQ&usg=AOvVaw1eealTktNh7mJh-Sh7MQDO

They can't even get the gas or electric right