Interesting article over on ars about some experimenters who have made a (small) silent aircraft. (I used to live near the big airport, my bedroom window about directly even with the flight path, so quiet sounds really, really good to me.)
The propulsion uses a wire that ionizes the air, combined with a small foil that is negatively charged, to attract the air ions, thus creating enough wind to push the craft forward, using no moving parts. This seems to be the first instance of the theoretical idea finding tech that is good enough to sustain it (principally, a lightweight lithium battery power source).
This was a short flight, but so was the first one by Wilbur and Orville, and look where that led. Perhaps you Jetsons flying car is only a few decades away.