The F-35 (Finally) Graduates From Its Flight Testing Phase, but Turbulence Remains

Lockheed Martin's (NYSE: LMT)F-35 flew its final developmental flight test on April 11, ending 11 years of tests that included 9,200 sorties and 17,000 flight hours through a range of conditions. It's a major milestone for the most expensive weapons platform in history, but challenges remain before the fighter can be declared the success that Lockheed investors hope it will be.