Just to annoy George Clooney, Elon Musk believes he can build an electric supersonic jet. From Damon Lavrinc at Wired:

“At the New York Times DealBook conference, Musk said there’s an ‘interesting opportunity to make a supersonic vertical takeoff landing jet,’ something he began to envision after the Concorde service ended nearly a decade ago.

The physics of getting enough power on board an electric aircraft to not only carry passengers, but maintain a supersonic speed, is still decades away. Not that it matters to Musk. Like the Hyperloop, it’s something he doesn’t have time to commit to developing. At least, not yet.”

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In 1968, Braniff predicts the future of air travel: