How is it the FAA not only worked the hijacking of 58November from BNA-JAX ; were defendants in the case, yest have no records indicating that my dad was not only hijacked, but shot to death in the plane?

Please see the letter I received from the FAA claiming no records exist on my dad's case.
Does anyone have any ideas as to why? Would anyone have a contact I could reach out to and try and get some answers?

I'm not sure if other can understand my position on this. It is like they have erased my dad's life and death out of the history books.
The FAA letter and other documents on the case are on this link. Also be aware there are crime scene pictures so don't open this around if you have kids in the room.

FBI Secret Memos on 58November - Imgur

[email protected] and please let me know your thoughts and ideas on where to go next.

It would mean a great deal to my family.
Andy Downs