French Cross the South Atlantic

On October 15, 1927, Captain Dieudonné Costes and his navigator, Lieutenant Commander Joseph Le Brix, carried out one of the most important long-distance flights of the interwar years when they flew nonstop from Saint-Louis in Senegal across the South Atlantic to Natal, Brazil. Their aircraft covered a route that earlier generations of aviators had regarded as nearly impossible: a long overwater passage linking West Africa to South America, with little margin for error and no possibility of emergency landing once they were committed to the ocean crossing.

The flight lasted 18 hours, a remarkable feat in an era when navigation depended on dead reckoning, maps, instruments, and the skill of the crew rather than modern radio aids or satellite guidance. Le Brix, already respected as a naval officer and navigator, played a decisive role in keeping the aircraft on course over the featureless Atlantic, where wind drift, cloud cover, and changing weather could easily have doomed the effort.

The successful arrival at Natal demonstrated that regular aerial links between continents were moving from dream to practical possibility. Costes and Le Brix were not merely seeking personal glory; they were helping prove that long-range aviation could shrink the Atlantic world and open new possibilities for mail, transport, and international air routes. Their crossing came at a moment when aviators around the world were pushing the limits of endurance and distance, and it stood alongside the great flights of the 1920s that captured public imagination after Charles Lindbergh’s crossing earlier that year.

In French aviation history, the Costes–Le Brix flight became a landmark, showing both the growing reliability of aircraft and the courage required of crews who flew vast distances with only the most basic safeguards.