Minangkabau International Airport (BIM) has been operating almost a decade and currently BIM can be visited using the airport bus provided by the City Government of Padang. Although the airport bus service is available, BIM visitors generally tend to choose private vehicles, such as cars or motorcycles. Considering the energy crisis and the negative impact of traffic, visitors are expected to shift to the airport bus, because the bus is more sustainable mode of transportation. However, this policy needs to be supported with sufficient information so that the target to be achieved can be realized. This study aimed to investigate factors that prevent visitors to use the airport bus and try to predict the potential demands. The results obtained from this study show that only 19 % of BIM visitors choose an airport bus as a mode of transportation. Other modes are selected because of some uncertainty on the airport bus service, which involves schedules and bus stop locations. In addition, a number of respondents did not even know of the existence of the airport bus service. If these problems can be solved, the potential airport bus users are predicted to reach 58 % of the total number of BIM visitors