Stealth or LO (Low Observables) governs the design of all of today's combat aircraft. Any plane or helicopter that might enter hostile airspace has to do its best to be undetectable. This means it must try to be invisible to radar, the eye, sensitive infra-red, or heat sensors, and silent. This program traces the attempts made by aircraft designers since World War II to try to achieve invisibility. This fascinating footage of stealth aircraft is accompanied by a detailed script by aviation expert Bill Gunson. Featured aircraft include the Lockheed F-I17A, Northrop B-2, GC/Boeing YF-22, McDonnell Douglas YF-23A, and more.