When you look at the engineering of the Wright Flyer:
1. propeller nearly double the efficiency of flat blades other contemporary experimenters used
2. a special engine that had about double the horsepower to weight ratio of any other engine at the time
3. a wing shape designed in a wind tunnel rather than seat-of-the-pants "bird shapes"
4. a 3 axis control system that worked
5. a research and development program that first identified the problems and solved them one by one with a series of prototypes
6. every modern airplane can trace its design back to the Flyer, and no other
7. the Flyer exists and can be examined
8. exact replicas of the Flyer have been made, and they fly like the Wrights documented the way theirs flew
it's pretty clear that none of the other "first flight" claimants have much of a case (especially since none of their alleged machines exist and can be examined).
1. propeller nearly double the efficiency of flat blades other contemporary experimenters used
2. a special engine that had about double the horsepower to weight ratio of any other engine at the time
3. a wing shape designed in a wind tunnel rather than seat-of-the-pants "bird shapes"
4. a 3 axis control system that worked
5. a research and development program that first identified the problems and solved them one by one with a series of prototypes
6. every modern airplane can trace its design back to the Flyer, and no other
7. the Flyer exists and can be examined
8. exact replicas of the Flyer have been made, and they fly like the Wrights documented the way theirs flew
it's pretty clear that none of the other "first flight" claimants have much of a case (especially since none of their alleged machines exist and can be examined).