What event does the Wright Brothers' achievement primarily commemorate?

The achievement of the Wright Brothers primarily commemorates the first powered flight they successfully conducted on December 17, 1903. This event marks a significant milestone in the history of aviation as it was the first time a heavier-than-air vehicle, piloted by a person, achieved sustained, controlled flight using its own engine. The Wright Brothers' aircraft, the Wright Flyer, flew for a total of 12 seconds and covered 120 feet during its first flight, demonstrating the feasibility of powered flight and paving the way for future advancements in aviation technology. This accomplishment set off a chain of innovations and developments in aeronautics that ultimately transformed the world of transportation and exploration. Other options, while related to aviation, do not pertain to the specific achievement of the Wright Brothers.