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The joint development of air transport and high-speed rail raises the question of the complementarity of these two modes of fast transport. In France, the efficiency of their interconnection, at Paris Charles-de-Gaulle and Lyon Saint-Exupéry airports, has yet to be demonstrated. A space-time evaluation presents several difficulties: modelling the process of modal transfer; using data from air and rail timetables; overlapping scales of analysis, from local to global; and creating accessibility indicators sensitive to the time of departure or arrival, implying a dynamic representation in time.This paper compares the intermodal TGV-plane offering with the monomodal air offering to measure its efficiency during the course of the day and on different dates. In the latter case, the objective is to study the impact on intermodal accessibility of the introduction of a new fast transport infrastructure, such as the TGV Méditerranée high-speed train line between Paris and Marseilles.