Abstract
This study explored quantitatively the changes in the various Japanese public transportation systems over the past 50 years. It was found that the ground transportation systems, such as the tram, bus, railway, and automobile systems, have effectively matured and saturated, while aerial and subterranean transportation systems have potential for growth. The hub-and-spoke system of Tokyo International Airport has already matured, and the flight routes are overcrowded. In contrast, local airports are not being used efficiently. The next generation air transportation system will depend on the effective utilization of many local airports. Japanese skies have high potential for development, which can be realized by using general aviation options such as business jets and piston engine airplanes. The evolution of Japanese transportation systems depends on the effective use of the Japan’s skies.
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