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Sign up for an annual CuriosityStream subscription and you’ll also get a free Nebula subscription (the new streaming platform built by creators) here: In the late 1950’s, intercity air travel was on the rise. But while a trip from New York to Boston by airplane might only take about an hour, you’d still need to get to and from the airport. And in many congested cities, that was already taking longer than the flight itself. As a solution, helicopter airlines had begun to
