In October 1909, de Laroche appealed to her friend, aviator and aeroplane builder
Charles Voisin to instruct her in how to fly. On 22 October 1909, de Laroche went to the Voisin brothers' base of operations at Chalons, east of Paris. Voisin's aircraft could seat only one person, so she operated the plane by herself while he stood on the ground and gave instructions. After she mastered
taxiing around the airfield, she lifted off and flew . Decades later, aviation journalist Harry Harper wrote that until de Laroche made her celebrated flight on the Voisin, she had only flown once, for a short hop, as a passenger. When she first took the controls, Charles Voisin expressly forbade her to attempt a flight; after taxiing twice across the airfield, she took off, flying "ten or fifteen feet high" and handling the controls with "cool, quick precision". Although
Gabriel Voisin wrote, "... my brother [was] entirely under her thumb", the story of de Laroche as a headstrong woman making the flight after scant preparation and against Voisin's orders almost certainly romanticises what took place.
Flight magazine, a week after the flight, reported: "For some time the Baroness has been taking lessons from M. Chateau, the Voisin instructor, at Chalons, and on Friday of last week she was able to take the wheel for the first time. This initial voyage into the air was only a very short one, and
terra firma was regained after ."
Flight was also responsible for bestowing the title "Baroness" upon de Laroche, as she was not of
noble birth. de Laroche became the first woman in the world to receive a pilot's licence when the Aero-Club of France issued her licence #36 of the
Fédération Aéronautique Internationale (International Aeronautics Federation or F.A.I.). Reims airshow in 1910, but actually showing an unknown Voisin biplane at the 1909 event, as obvious from the buildings De Laroche participated in aviation meetings at
Heliopolis in Egypt as well as
Saint Petersburg,
Budapest and
Rouen. During the show in St. Petersburg, she was personally congratulated by Tsar
Nicholas II. There, she was presented once again as "Baroness" de Laroche. Thereafter, the title became commonly used. In July 1910, de Laroche was participating in the week-long airshow at
Reims in France. On 8 July, her aeroplane crashed, and she suffered such severe injuries that her recovery was in doubt, but two years later, she was fit again and had returned to flying. On 26 September 1912, she and Charles Voisin were involved in an automobile crash. Voisin was killed, and she was severely injured. On 25 November 1913, de Laroche won the Aero-Club of France's
Femina Cup for a non-stop long-distance flight of over four hours duration. During
World War I, as flying was considered too dangerous for women, she served as a military driver, chauffeuring officers from the rear zones to the front under fire. one at ; and also the women's distance record, at . ==Death and legacy==