Answer:
Flying cars are very reliable in regards to the future economy and lifestyle.
Explanation
America is a very fast moving society, and thus, we tend to generate various ideas that will benefit our country. I would say that flying cars represents the ever-growing technology that we as Americans can have access to. We are in a way very high maintenance yet played by the creative imaginations of citizens today.
P.S. some of this you might not want to use, but I think this will lead you in the right direction