Amid restructuring and soaring cost projections, the Joint Strike Fighter is ticking off milestones that were expected months ago, but the gathering test pace must be maintained if the program is to stay on its new track and avoid further delays and cost growth. In two key milestones, the first Lockheed Martin F-35 mission-system test aircraft, BF-4, has returned to flight after modification, and the 737-based Cooperative Avionics Test Bed (CATBird) has begun flying with the latest ...


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