From 1996 to 2001, Boeing and Lockheed Martin produced rival designs and prototypes for the Joint Strike Fighter, a stealthy, affordable combat plane intended for the 21st century needs of the U.S. Air Force, Navy, and Marines. In "Battle of the X-Planes," NOVA goes behind the scenes to show the world's newest fighter taking shape, as Boeing and Lockheed Martin compete to win the largest contract in military history. NOVA's film crew was part of a small group allowed into both camps, in the first-ever inside look at a Department of Defense weapons competition. The team filmed inside installations where...