Rochefort-Saint-Agnant (BA 721) Airport — Rochefort/Saint-Agnant, France

RCO designates Rochefort-Saint-Agnant Airport, also known as Base Aérienne 721, a French Air Force installation located near Rochefort in the Charente-Maritime department of western France. The base has historically served as a training center, notably associated with French military flight instruction, and includes facilities tied to the broader Rochefort military-industrial and naval heritage of the region, which was once a major naval shipbuilding center under Louis XIV. As a military airfield, RCO handles Armée de l'Air operations rather than scheduled civilian passenger traffic, though the airfield has occasionally accommodated limited civil aviation activity alongside its defense functions.