these endnotes.
including more than 1,000 hours of audiotapes. In general, we cite docu-
ments and other materials by providing the agency or entity of origin, the
type of document (e.g., memo, email, report, or record), the author and recip-
ient, the title (in quotes) or a description of the subject, and the date.We use
the following abbreviations for the agencies and entities that produced the
bulk of these documents: AAL--American Airlines; CIA--Central Intelli-
gence Agency; DCI--Director of Central Intelligence; DHS--Department
of Homeland Security; DOD--Department of Defense; DOJ--Department
of Justice; DOS--Department of State; DOT--Department of Transporta-
tion; EPA--Environmental Protection Agency; FAA--Federal Aviation
Administration; FBI--Federal Bureau of Investigation; FDNY--Fire
Department of New York; GAO--General Accounting Office; INS--Immi-
gration and Naturalization Service; NEADS--Northeast Air Defense Sec-
tor; NSA--National Security Agency; NSC--National Security Council;
NTSB--National Transportation Safety Board; NYPD--New York Police
Department; OEM--Office of Emergency Management, City of New York;
PANYNJ or Port Authority--Port Authority of New York and New Jersey;
PAPD--Port Authority Police Department; SEC--Securities and Exchange
Commission; Treasury--Department of Treasury; TSA--Transportation
Security Administration; UAL--United Air Lines; USSS--United States
Secret Service.
Tenet interview (Jan. 22, 2004)." Testimony by witnesses at one of the Com-