The competition between Aviation and High Speed Rail (HSR) are analyzed. Competition and cooperation between aviation and HSR occur in each place in Japan, and there are a lot of examples that the opening HSR is lead to the reduction of flights and the withdrawal of the domestic airline. Then, competitive condition between Aviation and HSR are different from previous condition in this research region which have some routes and transportation mode between Tokyo and research region. This transportation market will become super competitive condition because of the total travel time is almost same from Tokyo, and can be used some route using limited express train. After the new HSR opening, aviation market might be shrinks because of changing the users' transportation mode from aviation to HSR. Furthermore, new extension of HSR will open in 2023 in this region, then competitive condition, travelers' transportation mode choice and transportation preference might change compared with opening new extension of HSR. In this study, we discuss the competition and cooperation between Aviation and HSR under changing aviation market and new HSR opening. The purpose of this study is to examine mode choice priority using paired comparison method. In this study, some questionnaire surveys which is Stated Preference method were conducted for travelers at airport and railway station in research region. As a result of this analysis, it became clear that there is a difference in mode choice priority between railway users and airline users. Moreover, priority of mode choice under super competitive market are effected by new extension of HSR.
