The VIPAFLEET project aims at developing a framework to manage a fleet of Individual Public Autonomous Vehicles (VIPA). We consider a fleet of such cars distributed at specified stations in an industrial area to supply internal transportation , where the cars can be used in different modes of circulation (tram mode, elevator mode, taxi mode). We treat in this paper the pickup and delivery problem related to the taxi mode by means of flows in time expanded networks. We compute optimal offline solutions, propose a replan strategy for the online situation, and evaluate its performance in comparison with the optimal offline solution. Keywords: fleet management, offline and online pickup and delivery problem The project VIPAFLEET [5] aims at contributing to sustainable mobility through the development of innovative urban mobility solutions by means of fleets of Individual Public Autonomous Vehicles (VIPA) allowing passenger transport in closed sites like industrial areas, medical complexes or airports. 1