This. At first, I wondered why the NTSB was getting all the design data from the company, much of which must be proprietary and, as a one-off custom design craf

This. At first, I wondered why the NTSB was getting all the design data from the company, much of which must be proprietary and, as a one-off custom design craft, not useful to the NTSB. I mean, wouldn't the company want to do its own research and find out what happened so it can fix it and resume flights? But then I realized that it's better for everyone if an outside party learns all it can and essentially debugs their design, like Feynman did with the space shuttle. One might even wonder if they aren't getting some highly expert aerospace consulting done for free.