Imagine a world in which autogyros ferry mail to and from city centres, landing and taking off from the top of post office buildings. Large models carry up to five people at a time, while newspapers use smaller versions to rush photographers to where the news is happening. Sound far fetched? Well it shouldn't do, because this is a scene from America in the 1930s. And, if two modern-day companies have their way, the scene is about to be replayed.
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