Elon Musk came out of an aerospace nowhere and built SpaceX, a successful rocket booster company, one that will likely carry cargo and perhaps astronauts to the International Space Station, and most probably beyond. He also launched an electric sports car with his Tesla Motors venture.
Now Musk, an avid pilot who uses business jets to boost his productivity (like most really smart businessmen), says he would like to develop an electric aeroplane.
Not just any aeroplane, but a supersonic one.
Take a listen to his stream-of-conscious thoughts on 7 April in this YouTube video, starting at 1:50 or so.