The "World Air Speed Record" refers to the highest speed achieved by an aircraft in level flight. This record is officially recognized by the Fédération Aéronautique Internationale (FAI), which sets the rules and standards for aviation records. Various types of aircraft, including jets and propeller-driven planes, have competed for this title over the years. As of October 2023, the fastest recorded speed is held by the North American X-15, a rocket-powered aircraft that reached speeds of 4,520 miles per hour (7,274 kilometers per hour) in 1967. This remarkable achievement showcases advancements in aerospace technology and engineering.