Neil Gould writes:

Regional jets and the smaller light jets such as the above companies are
introducing can use the shorter runways of GA airports, and therefore
become more efficient ways to travel. While it's early in that curve, the
idea is based on the already successful corporate jet enterprises (that
also use GA airports). So, it directly answers your original question
about the viability of GA.

A great deal of additional infrastructure would be required at many GA
airports in order to make them suitable for ordinary commercial
airline services, irrespective of the type of planes used. Just
flying planes that can accept a shorter runway would only cover the
tip of the iceberg.

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