Abstract
The rapid progress of motorization and the development of airline flight path networks have altered the structure of the transportation demand in Japan since the 1960's. This study aims to observe the changes in the development of such networks from 1960 to 1990 based on travel time and cost, and to evaluate them basedon transportation users' value of time. In evaluation, we propose an index whichis the ratio of difference in time to cost between two modes of transport. The results show differences between regions in the network development as recently as 1990. It has been concluded from these figures that people living in big cities receive higher mobility services than those in rural areas.
