On September 4 [2001], the FBI sent a teletype to the CIA, the FAA, the Customs Service, the State Department, the INS, and the Secret Service summarizing the known facts regarding Moussaoui. It did not report the case agent’s personal assessment that Moussaoui planned to hijack an airplane. It did contain the FAA’s comment that it was not unusual for Middle Easterners to attend flight training schools in the United States.⁹⁹

Although the Minneapolis agents wanted to tell the FAA from the beginning about Moussaoui, FBI headquarters instructed Minneapolis that it could not share the more complete report the case agent had prepared for the FAA. The Minneapolis supervisor sent the case agent in person to the local FAA office to fill in what he thought were gaps in the FBI headquarters teletype.¹⁰⁰ No FAA actions seem to have been taken in response.

There was substantial disagreement between Minneapolis agents and FBI headquarters as to what Moussaoui was planning to do. In one conversation between a Minneapolis supervisor and a headquarters agent, the latter complained that Minneapolis’s FISA [Foreign Intelligence Surveillance Act] request was couched in a manner intended to get people “spun up.” The supervisor replied that was precisely his intent. He said he was “trying to keep someone from taking a plane and crashing into the World Trade Center.” The headquarters agent replied that this was not going to happen and that they did not know if Moussaoui was a terrorist.¹⁰¹