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  If things had gone a little differently, the Rotodyne could have been a more convenient way to short haul air travel than the regional jets we now use. [credit:
  Hulton Archive/Getty Images ]

The phrase “Urban Air Mobility” (UAM) seems like it’s been with us for quite a while, but really it’s only been in widespread use for two or three years. NASA officially recognized UAM in 2017, calling for a market study of remotely piloted or unmanned air passenger and cargo transportation around an urban area. Most people would probably call this the “air taxi” idea—a vision of hundreds of small, unmanned electric multi-copters shuttling two or three passengers from nearby suburbs or city spaces to vertiports at about 100 mph (144 km/h).

But if things had worked out differently in the late 1950s and early 1960s, we might have a very different understanding of UAM—something more like mass-transit. We might have had a city-center to city-center 55-passenger vertical take-off and landing (VTOL) airliner shuttling between urban heliports at 180 mph (289 km/h).

Actually, we did have that, it’s just few people remember. It was called the Fairey Rotodyne.