Works for cars, so why not airplanes?
Imagine a hyper-efficient aircraft as large as a Boeing 737, although weighing much less. It would run quieter and cleaner than any other commercial plane ever made, requiring two-thirds less energy, according to NASA-funded research.
The hybrid-powered jetliner of the future would operate on batteries or jet fuel, depending on whether it's cruising or taking off and climbing, when the most thrust is required.
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