the fastest aircraft ever made is the NASA X-43. The X-43 is an unmanned experimental aircraft designed to explore hypersonic flight. It achieved a top speed of approximately Mach 9.6, which is about 7,346 miles per hour (11,763 kilometers per hour) or roughly 10 times the speed of sound. However, it's important to note that the field of aviation is constantly evolving, and new advancements may have been made since then.