The naval version of Lockheed Martin's Joint Strike Fighter concept demonstrator went supersonic for the first time this week, the company announced yesterday. During separate flights, Lockheed's X-35 carrier version aircraft reached speeds of Mach 1.05 and Mach 1.1, according to a company statement. "The flights are the first in a series designed to test the X-35C at increasingly higher supersonic speeds, and they are among the last before the plane's scheduled transcontinental flight to the U.S. Navy flight-test center...