The X-43, an experimental aircraft, holds the distinction of being not only the fastest fighter jet but the fastest aircraft ever built period, having achieved a top speed of Mach 9.6. As part of a $230 million Hyper-X program, the National Aeronautics and Space Administration (NASA) developed the X-43 to explore hypersonic flight. In doing… Continue reading The Fastest Fighter Jet in History: The NASA X-43