Although Santos-Dumont continued to work on non-rigid airships, his primary interest soon turned to heavier-than-air aircraft.
By 1905, he had finished his first fixed-wing aircraft design, and also a helicopter.
Santos-Dumont finally succeeded in flying a heavier-than-air aircraft on 23 October 1906, piloting the 14-bis before a large crowd of witnesses at the grounds of Paris' Château de Bagatelle in the Bois de Boulogne for a distance of 60 metres (197 ft) at a height of about five meters (16 ft).
This was the first flight of a powered heavier-than-air machine in Europe to be certified by the Aéro-Club de France, and won the Deutsch-Archdeacon Prize for the first officially observed flight of more than 25 meters.
 On 12 November 1906 Santos-Dumont set the first world record recognized by the Federation Aeronautique Internationale, by flying 220 metres (722 ft) in 21.5 seconds.
On that date he became the first person to be filmed in an airplane in flight.
As late as 1906 he was reported as stating that the Wright Brothers claim to have flown for thirty miles was mere bluff.

Santos-Dumont's final design were the Demoiselle monoplanes (Nos.
19 to 22).
These aircraft were used by Dumont for personal transport.
 The fuselage consisted of three specially reinforced bamboo booms, and the pilot sat a seat between the main wheels of a tricycle landing gear.
The Demoiselle was controlled in flight by a tail unit that functioned both as elevator and rudder, and by wing warping (No.
20).

In 1908 Santos-Dumont started working with Adolphe Clément's Clement-Bayard company to mass-produce the Demoiselle No 19.
They planned a production run of 100 units, built 50 but sold only 15, for 7,500 francs for each airframe.
It was the world's first series production aircraft.
By 1909 it was offered with a choice of three engines: Clement 20 hp; Wright 4-cyl 30 hp (Clement-Bayard had the license to manufacture Wright engines) and Clement-Bayard 40 hp designed by Pierre Clerget.
The Demoiselle could achieve a  speed of 120 km/h.

The Demoiselle could be constructed in only 15 days.
Possessing a good performance, flying at a speed of more than 100 km/h, the Demoiselle was the last aircraft designed by Santos-Dumont.
The June 1910 edition of the Popular Mechanics magazine published drawings of the Demoiselle and stated, "This machine is better than any other which has ever been built, for those who wish to reach results with the least possible expense and with a minimum of experimenting."
American companies sold drawings and parts for Demoiselles for several years afterward.
Although Santos-Dumont continued to work on non-rigid airships, his primary interest soon turned to heavier-than-air aircraft. By 1905, he had finished his first fixed-wing aircraft design, and also a helicopter. Santos-Dumont finally succeeded in flying a heavier-than-air aircraft on 23 October 1906, piloting the 14-bis before a large crowd of witnesses at the grounds of Paris' Château de Bagatelle in the Bois de Boulogne for a distance of 60 metres (197 ft) at a height of about five meters (16 ft). This was the first flight of a powered heavier-than-air machine in Europe to be certified by the Aéro-Club de France, and won the Deutsch-Archdeacon Prize for the first officially observed flight of more than 25 meters.  On 12 November 1906 Santos-Dumont set the first world record recognized by the Federation Aeronautique Internationale, by flying 220 metres (722 ft) in 21.5 seconds. On that date he became the first person to be filmed in an airplane in flight. As late as 1906 he was reported as stating that the Wright Brothers claim to have flown for thirty miles was mere bluff.
Santos-Dumont's final design were the Demoiselle monoplanes (Nos. 19 to 22). These aircraft were used by Dumont for personal transport.  The fuselage consisted of three specially reinforced bamboo booms, and the pilot sat a seat between the main wheels of a tricycle landing gear. The Demoiselle was controlled in flight by a tail unit that functioned both as elevator and rudder, and by wing warping (No. 20).
In 1908 Santos-Dumont started working with Adolphe Clément's Clement-Bayard company to mass-produce the Demoiselle No 19. They planned a production run of 100 units, built 50 but sold only 15, for 7,500 francs for each airframe. It was the world's first series production aircraft. By 1909 it was offered with a choice of three engines: Clement 20 hp; Wright 4-cyl 30 hp (Clement-Bayard had the license to manufacture Wright engines) and Clement-Bayard 40 hp designed by Pierre Clerget. The Demoiselle could achieve a  speed of 120 km/h.
The Demoiselle could be constructed in only 15 days. Possessing a good performance, flying at a speed of more than 100 km/h, the Demoiselle was the last aircraft designed by Santos-Dumont. The June 1910 edition of the Popular Mechanics magazine published drawings of the Demoiselle and stated, "This machine is better than any other which has ever been built, for those who wish to reach results with the least possible expense and with a minimum of experimenting." American companies sold drawings and parts for Demoiselles for several years afterward.
Alberto Santos-Dumont