In this study, the changes in various Japanese public transportation systems over the past 50 years are examined quantitatively. It is found that ground transportation systems, such as the tram, bus, railway, and automobile systems, have effectively matured and reached saturation, while aerial and subterranean transportation systems have potential for growth. The hub-andspoke system of Tokyo International Airport has already matured, and its flight routes are overcrowded. In contrast, local airports are not used efficiently. The potential of an air taxi business using small piston-engine airplanes is investigated for the Tohoku region (northern Japan). In particular, the focus of this analysis is economic considerations based on time costs. The results show the high potential for growth of an air taxi business in Japan. The evolution of Japanese transportation systems depends on the effective use of many local airports.
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机译：在这项研究中，定量地检查了过去50年来各种日本公共交通系统的变化。结果发现，地面运输系统，如电车，公共汽车，铁路和汽车系统，有效地成熟并达到了饱和度，而空中和地下运输系统具有增长潜力。东京国际机场的集线器系统已经成熟，其航线已经过度拥挤。相比之下，当地机场没有有效使用。使用小型活塞 - 发动机飞机的Air Air Taxi业务的潜力用于Tohoku地区（日本北部）。特别是，这种分析的重点是基于时间成本的经济考虑因素。结果表明，日本航空出租车业务增长的高潜力。日本交通系统的演变取决于许多当地机场的有效利用。
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