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October 10, 1902. Kitty Hawk, N.C. "Wilbur gliding in level flight, moving to right near bottom of Big Hill." Glass negative by Orville Wright. View full size.
I thought the first flight was December 17, 1907.
[If you're talking about the first powered flight, that would be 1903, not 1907. Our photo shows a glider flight in 1902. - Dave]
Hey - I just got back from there. A few days in Kitty Hawk, then Hatteras Island (farther South). Beautiful place. Still haven't even actually been to the Wright Brothers Monument, though, after going there every summer as long as I can remember. But I do know they preserved the actual hill they used, and that is what the monument now stands on top of.