Chinese Hack BAE to learn about F-35

This plane will have taken more than $385 billion to develop and will take $1 trillion to sustain. It is the most expensive weapons system in history. And yet for 18 months, the Chinese were just living on (at least) BAE’s networks taking what they wanted. How much of the considerable cost and rework on this program comes from the data on it China has stolen along the way? 
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