De Geouffre de La Pradelle, Paul Keywords: Airspace | Borde | Mots clefs: Espace aérien | Frontières | ABSTRACT In this course, Paul Geouffre de la Pradelle works at a twofold goal: to denounce respectively the imperfections and disadvantages of a rigorous application of the border system to aeronautics. To point out the made efforts to free the air communications from the inconveniences imposed on them by sovereignties in this manner and to explain the reasons of law, justice and peace that recommend their extens…