Providing high-quality service information is important in attracting and retaining public transportation passengers. Currently, information provided to support transit-trip itinerary planning is either difficult to use or to access. Furthermore, after obtaining the information, passengers are required to perform a fairly complex search process to extract an itinerary. Two technologies that are becoming commonly used in public transportation, Geographic Information Systems (GIS), and the World Wide Web (WWW), offer capabilities to provide an easily accessible, highly functional tool for trip itinerary planning. This research effort investigated the feasibility of integrating these emerging technologies to produce a transit-trip itinerary planning tool.