You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
Seriously. Musk states in his hyperloop design "A quiet supersonic plane immediately solves every long distance city pair..."
a 50/50 SpaceX + Tesla joint venture should start developing small, private electric planes. They are currently technologically feasible. See the study below
With the Model S's battery density and a L/D of 20 (easy with the team's design skills) you get about 900KM range.
The craft would be similar to the original roadster, a manufacturable technology demonstrator which opens the product to incremental improvements.
The paper cover's the physical possibilities of electric aircraft. Very easy to understand even for non engineers. Skim away.