The Wright Brother’s revolutionary achievements in Dayton, Ohio made flying a practical reality, which has changed the course of human history over the last 120 years. The four sites linked to these achievements are critically important as they preserve the historical evidence of the Wright Brother’s transformative work. These sites’ inclusion on the World Heritage tentative list not only emphasizes that they possess outstanding universal value but also affirms that the U.S. federal government recognizes Dayton’s pivotal role in early aviation history.