In the mid-1950s, people began to consider the possibility of moving ENAC to a new location. Potential locations all involved cities close to Parisian airports. Thus, between 1954 and 1957, Thiais, Rungis, Issy-les-Moulineaux, Les Mureaux and even Le Bourget were all considered. That's not counting with the requirements of decentralization. Even before the famous book by Jean-François Gravier, "Paris et le désert français" (Paris and the French desert), decentralization was considered a key priority. Plans to keep ENAC close to Paris looked increasingly doubtful, and more peripheral locations began to be considered. The potential locations were all part of a 150 km radius around the capital, among others Melun, Pontoise, Coulommiers, Étampes, Reims, Évreux, Chartres and Orléans. Meanwhile, a report published on 20 May 1959 listed the disadvantages of a location too distant from Paris, such as difficulties of transporting personnel, the possible extension of duration of the courses, and increased operating costs.