This startup wants hybrid planes in the air by the 2020s

The future of American domestic flight could be electric — or, at the very least, a hybrid.  
Aviation startup Zunum Aero emerged from stealth mode and announced a bold plan to bring hybrid-electric plane travel to the United States on a large scale. 
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The company has been operating under the radar for the past three years and debuts with a number of patents already in place. It also has the ba