As they reach cruise altitude, the crew of the high-wing Boeing airliner throttle back its twin turbofans to idle. Verifying that battery levels are adequate, they then do something that would be unthinkable in today's aircraft: They shut down the gas turbine core of each engine. The crew of this futuristic low-emissions aircraft will instead allow the aircraft to rely completely on battery-driven electric motors that are buried deep inside each engine. Having augmented power during ...

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