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Lockheed Martin says its F-35 fighter aircraft fleet recently exceeded 100,000 flight hours while the F-35 Integrated Test Force teams are completing the remaining requirements in the program’s System Development and Demonstration phase.

“This 100K milestone marks a significant level of maturity for the program and the F-35 weapons system,” Lockheed Martin Executive Vice President and F-35 Program General Manager Jeff Babione. said in a statement. “We are well positioned to complete air vehicle full 3F and mission systems software development by the end of 2017.”

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The remaining development flight testing includes validating the final release of 3F software, F-35B ski jump testing, F-35B austere site operations, high-Mach Loads testing for both the F-35B and F-35C and completion of the remaining weapons delivery accuracy tests, according to the company.

It listed the major SDD fleet test milestones in recent months as the following: