When Elon Musk isn't mulling over self-driving cars or rocket launches, he has another thing on his mind: electric airplanes.
In a recent interview with Marketplace, the Tesla Motors and SpaceX founder said he believed the future of transportation - including everything from cars to airplanes and ships - will be fully electric-based.
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Musk is particularly keen on the idea of electric airplanes. In the Marketplace interview, he said he has a design in mind for a "pretty cool supersonic, vertical take-off and landing electric jet" that would be "really fun."
He also likes the idea of an airline company based solely on electric power. See the video here.
This isn't the first time Musk has expressed interest in electric planes. During MIT's Aeronautics and Astronautics Centennial Symposium last fall, Musk briefly mentioned building an electric supersonic aircraft but said that as much as he would like to do it, he thinks "his mind might explode." See video below.