Isn't it argued that it was actually Alberto Santos-Dumont who was the first to fly an airplane?
From the perspective of the French, maybe.
Well, the Wright kept their invention under wraps post 1905 till 1908, since
they tried negotiating with different countries and their respective
departments, which proved rather difficult while being the first, and as
such they didn't made any further public flights to prove their 25 miles
flight of 1905 again, which was done on the Huffman Prairie in 1905 witnessed
by some spectators. The Wrights feared being copied before they didn't landed
a decent contract. During this time the French didn't believe the Wright's
claim about the performance of their craft and marked them as lairs on the
quiet.
In 1906 Santos-Dumont flew his 14-bis flying machine, which was sort of a copy
of the 1902 glider of the Wrights based on public information available due
to the Wrights themselves, via photos and a description, and due to Octave
Chanute who witnessed the Wrights during their 1902 glider experiments. In
Oktober 1906 Santos-Dumont flew about 50 Meter and has won the Coupe
d'Aviation Ernest Archdeacon for the first public flight of over 25 Meter. In
November of 1906 Santos-Dumont flew about 222 Meter, about 30 Meter short of
what the Wrights did in 1903, winning another huge price. All of France was
impressed by the result. Santos-Dumont was heralded as the The Triumphant One.
The press marked this flight as the most positive advance in aeronautics.
Since the Wrights haven't shown their 1905 Flyer in public during this time,
many of the French had no idea about what the Flyer was capable of, yet have
ever seen a heavier-than-air machine flying.
Hence, many of the French thought that Santos-Dumont was perhaps the first
one. People could witness his flights since he took also part in many
competitions the Wrights didn't due to known reasons, which gave Santos-Dumont
some fame, yet he drew from the Wrights like all initial French aviators
during this period.
But within the aviation community there was no question about who made the
first powered flight. Even the French aviators knew the Wrights did before
anyone else in 1903. They just played with the Wrights during 1905 to 1908
in downplaying the performance of their 1905 Flyer, since they were in need
for money from their own government, which was hard to get during this time.
And there was a certain fame to make, since the French were still in their
infancy during this period and the Wrights refused to show their 1905 Flyer to
the public.
However, in 1908 the Wrights showed the French. They demonstrated the
performance of their Flyer in France. Many of the important French aviators
witnessed this flight. And they knew what they saw. Their were all stunned.
Wilbur flew the aircraft in a way no French was able to do. He was able to
run curves, banking deep, stabilize etc. at will and to a degree the French
aviators had only dreamed of.
One could say that Santos-Dumont flew the first aircraft in public in 1906
for about 50 Meter while being witnessed by a huge audience. Yet the Wrights
flew about 40 Kilometer in 1905 witnessed by only a bunch of people at the
Huffman Prairie near Dayton, Ohio. This was their last major flight till
1908. The brothers knew they had solved the problem of ages and now wanted to
earn the fruits of their invention, an invention build in an environment of
people saying that flying of a self-sustained heavier-than-air machine is
impossible.