In the end, Boeing and Lockheed Martin presented the X-32 and X-35 concept demonstrators, respectively, for the air forces of several countries to choose a final design. According to the US ...

But before the F-35 entered production and proliferated, it had to win its place in a head-to-head competition with another fighter concept: the Boeing X-32. In the 1990s, the U.S. spearheaded a ...