Think Los Angeles at rush hour is bad? Try doing it half-blindfolded with nothing but a radio and a few blinking lights to show you the way. That's how pilots navigate the invisible highways in the sky, and there's a beautiful design that makes it all work. It only took about a hundred years to come up with it.
Source: http://feeds.gawker.com/~r/gizmodo/full/~3/LPcPiwGPFKk/a-brief-history-of-airspace-design-1469196960
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