Can combat aircraft ever be truly "invisible"? Get a good look at the history of stealth fighters in this comprehensive documentary, which reveals that the formidable technology was being developed as early as World War II. The program includes thrilling footage of the Lockheed F-I7A, Northrop B-2, McDonnell Douglas YF-23A, and other planes built to fly under the radar. 59 min. Standard; Soundtrack: English.