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That is actually substantially more safe and reliable in many cases. The code could be so complex, it would be a massive task and very risky to try and replicate it. I have not worked with FAA directly, but seen the same in other industries.I remember reading a while back that some of the IBM computers the FAA used were replaced by newer ones running an emulator so they could run the original programming. Writing a good emulator is easier than writing new flight software.