In the history of aeronautics, the balloon has long been regarded as relatively unimportant—or even excluded from the field; “lighter-than-air” technology (to use the expression coined by Nadar) was considered a dead-end which may have delayed the arrival of airplanes at the beginning of the twentieth century. However, in the early years of aviation, both technologies were deeply interrelated on numerous levels, sharing the same milieu of entrepreneurs, pilots (for instance the remarkable Santos Dumont) and public enthusiasm. But the disappearance of dirigibles accompanies the construction of a heroic history of powered flight by the airplane as a symbol of modernity. However, the focus has recently shifted, through the work of eminent aviation historians such as Tom Crouch,1 and also because dirigible history has returned to the scene—for instance through the excellent studies of Guillaume de Syon who has stressed the popular and political mobilization that sustained the impressive development of this technology from the last decade of the nineteenth century until the 1930s. From the point of view of the aeronautics community (lobbies, technicians and publicists), 1880s dirigibles were a technology of the future that inherited a longstanding culture originating in the first aerostatic experiments at the end of the eighteenth century. If balloons could not yet be steered, aerial displacement was indeed a practical technique applied in races and experiments, and associated with learned societies, conferences and shows. Such endeavors nourished public expectations, political investments and, with the introduction of the dirigible, even fostered an institutional regulatory framework in the first international aerial law, as in the international conference at La Haye in 1899.