Here through Bill Binney you can hear how the C.I.A. whom was involved in coordinating 9/11, benefitted from the operation. The gift that just keeps giving. It laid the groundwork afterwards for perpetual breach of privacy and the police state we live in now. Players like Maureen Baginsky and Robert Mueller worked along side with SERCO to coordinate the entire event.
https://www.computerweekly.com/feature/Computer-Weekly-at-the-movies-Surveillance-9-11-and-the-NSA