A lot of things in the past have been disputed about who did what first. And what even constitues a true success. I don't think anyone now would dispute that Columbus wasn't the first to the Americas. But what happened because of his voyage is what set things in motion.
I guess some will say this proves American arrogance in proproganda to minimaze non-American accomplishments and stealing the credit, etc.
I don't blame them a bit for their view of the proper celebration of beginning of flight. I don't think it's even the only example of dispute of the Wright brothers claim of first powered flight of an heavier than air craft. It wasn't their first attempt either. They had aborted in September of the same year I believe because of weather.
So there's probably room to celebrate both, even with disagreement of exactly who deserves credit for what.
roger

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic