The crucial noise footprint of Sky Taxis can be predicted before such aircraft are built.

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This paper not only explains the reasons for predicting a Sky Taxi's noise, but shows that without fulfilling strict noise limits, the meaningful benefits of mass market Regional Sky Transit to climate change and surface gridlock will be lost and the system will devolve to be merely a few, very expensive, limited route Sky Limos. This makes clear the need for noise standard setting and for a global competition for silent short take off--The Sustainable Aviation Challenge.

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