The concept is familiar: Replace car journeys with high-speed, electric-powered travel for the masses. China does it with a famous (and famously expensive) high-speed train network. Last week, the Boeing Co. and JetBlue Airways Corp. invested in another idea: electric planes. If their bet pans out, travelers could start making their first trips in the Teslas of the air in a decade. That could transform the way great swathes of the world get from point A to point B -- to everyone's benefit.
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