Smithsonian National Postal Museum, Washington, D.C.

The skyline of fighter jets is changing quick with the addition of modern fifth-generation aircraft to air forces around the world. Do you think you can pick out some of the most advanced aircraft on ...

A’s Legacy Go Operational? -In 2004, NASA’s X-43A set the air-breathing speed record at Mach 9.6, validating scramjet combustion but only for 10 seconds before gliding to splashdown. -The demo ended ...