In that film they portray the NTSB investigators as trying to paint the pilot in a bad light during the investigation. According to the folks involved in the investigation, including the pilot, this never happened.
These are real people, they don't have the reach or voice of a movie, what happens when someone decides to portray them unfairly?
Legally I don't think there's anything to be done, there would be too many bizarre second order effects if you simply couldn't portray someone without their permission. At the same time it seems morally questionable to not involve them, specifically if their voice is so much smaller than the medium.