[1] By August 1925, Le Brix was serving in French Naval Aviation's Escadrille (Squadron) 5.B.2 and taking part in the Rif War, flying missions over Spanish Morocco in a Farman F.60 Goliath.

He flew geographic survey missions over the Sahara Desert in southern French Morocco until 1927, pioneering the use of maritime navigation techniques not yet in wide use aboard aircraft.

Le Brix and Costes were both awarded the Distinguished Flying Cross by a special act of the Congress of the United States on 2 May 1928 in recognition of their achievement.

[1] Now rivals, Le Brix and Costes planned to set out in early 1929 in separate attempts to become the first pilot to fly from Paris to Saigon in French Indochina in fewer than five stages.

Le Brix secretly set out first, taking off in February in the Bernard 197GR from Istres, France, with his copilot Antoine Paillard and mechanic Camille Jousse.

[1] Le Brix, Doret, and Mesmin decided to follow up their success by using Trait d'Union to attempt the first non-stop flight between Paris and Tokyo.

[1] Undaunted, the men decided to make a second attempt, departing Paris–Le Bourget Airport on 11 September 1931 in a second Dewoitine D.33 named Trait d'Union II, hoping to beat their competitors, Paul Codos and Henri Robida, who took off the same day in the Breguet 19 TF Super Bidon Point d'Interrogation also intending to fly nonstop to Tokyo; Codos and Robida, however, were forced to land at Düsseldorf, Germany, after only a few hours.

Flying on, Le Brix, Doret, and Mesmin were over Ufa in the Soviet Union on 12 September when the aircraft's engine failed and they decided to bail out.

Streets in Baden, Nantes, Lorient, Bourges, Toulouse, Tours, Marseille, Vannes, Pontivy, and Saint-Avé, among others, bear his name, as does a plaza in Langueux.

The Passions and Wings museum in Baden is dedicated to Le Brix and his biography, and a memorial plaque in his honor is mounted on the façade of Collège Jules Simon in Vannes, where he was a student.