An anonymous reader writes: In a dogfight of defence contractors, the hunter can quickly become the hunted. It's happening now to the F-35. The world's largest defence contractor, Lockheed Martin, is trying to convince wavering U.S. allies — including Canada — to stick with its high-tech, high-priced and unproven F-35 stealth fighter. But the F-35 is way behind schedule, way over budget and, now, it's grounded by a mysterious crack in a turbine fan. After years of technical problems, it's a tempting target for Lockheed Martin's rivals. It's no surprise, then, that the No. 2 defence contractor, Boeing, smells blood... The Super Hornet, it says, is a proven fighter while the F-35 is just a concept — and an expensive one at that.