The FBI, itself, declares on its website that "attempts to confirm the true identities of these [hijackers] are still under way".
Of course if you actually look at the FBI website they link to, you will quickly discover:
Press Release
For Immediate Release
September 27, 2001
Washington D.C.
FBI National Press Office
(202) 324-3691
This is like linking to an old White House press release from 1999 and declaring that Bill Clinton is still president.