September 11: the attacks, preparations and missed warnings

The September 11, 2001 attacks killed 2,977 people, excluding the hijackers. The records include the aircraft hijackings, passengers and crew, preparations, financial transactions, intelligence warnings, emergency response and subsequent investigations and proceedings.

The attacks and the lives lost

Two hijacked aircraft struck the World Trade Center, one struck the Pentagon, and Flight 93 crashed in Pennsylvania after passengers and crew resisted. The attacks killed 2,977 people, excluding the hijackers.

From Afghanistan to the aircraft plot

The Commission traces bin Laden's Afghan-era organizing, the formation of al-Qaeda, its Sudan period and return to Afghanistan. KSM developed the aircraft proposal; bin Laden and Mohammed Atef provided organizational backing. Some planning details derive from detainee reporting.

American contacts and flight training

The cited records document US aid to anti-Soviet Afghan factions. The Commission described bin Laden’s group as having its own support and training. It recorded Ali Mohamed’s US Army service and later work with extremists. Commercial flight schools taught the pilot-hijackers.

Preparations in the United States

The chronology records entry, school, rental, travel and payment records from 2000 through September 2001 and identifies all 19 hijackers, grouped by flight.

The Commission’s financing figures

The Commission estimated plot costs at $400,000–$500,000 and approximately $300,000 in US bank-account inflows. Six Ali transfers totaled $119,500. Approximately $26,000 was returned unused.

Information was available; coordination failed

Oversight findings identify failures to evaluate, investigate and share important information. Hazmi and Mihdhar were not promptly tracked after intelligence identified their travel.

Flight 93 and the emergency response

The Commission describes passengers and crew on Flight 93 learning of the other attacks and counterattacking before the crash. Its account also records the information available to the FAA and military and their responses.

Subsequent proceedings and health effects

The cited records include Moussaoui’s guilty plea and life sentence, a June 2026 Supreme Court petition in another proceeding, and accounts of long-term health effects.

Civil litigation and military proceedings

A November 5, 2025 court order stayed proceedings involving Saudi Arabia pending its interlocutory appeal and recorded an earlier denial of a jurisdictional-dismissal motion. The separately cited reporting describes the military trial setting.

Rescue on land and water

The emergency response included firefighters, police, building staff and civilian mariners. The Coast Guard’s retrospective interview adds the boatlift, its organizers and landing routes to the account.

People aboard Flight 93

The public memorial entries identify passengers and crew aboard Flight 93. Linked records describe calls and resistance.

NIST’s WTC 7 investigation

NIST’s engineering findings connect uncontrolled fires, interrupted water supply and the probable failure sequence at Column 79.

Newly released warnings

The September 2026 release expands the public record of presidential threat reporting. It includes warnings about domestic attacks, hijackings, al-Qaeda’s reach and operational capabilities. The July 1998 brief called its sources highly questionable; the September aircraft warning was later described by the Commission as uncorroborated.

A financing claim and a different later finding

An October 1999 brief alleged investments in 57 narcotics laboratories. A February 2000 memorandum returned to the drug allegation. The Commission’s 2004 report found no reliable evidence that bin Laden participated in or earned money from drug trafficking.

Before and after the attacks

The August 6, 2001 brief described threats inside the United States, suspicious activity and ongoing FBI investigations. The September 12 situation report was a post-attack assessment. Its retrospective accounts of preparations are recorded with that publication date.

People, Places and Supporting Records

Sources and Records

  1. 9/11 FAQs
  2. September 11, 2001 Timeline
  3. 9/11 Commission, chapter 2: Bin Laden and the origins of al-Qaeda
  4. 9/11 Commission, chapter 5: The aircraft plot and Hamburg group
  5. 9/11 Commission, chapter 7: Preparations and the U.S. support network
  6. 9/11 and Terrorist Travel: staff monograph
  7. Terrorist Financing: staff monograph
  8. Review of FBI handling of intelligence: recommendations and conclusions
  9. Staff Statement 2: Identification, Watchlisting, and Tracking
  10. 9/11 Commission, chapter 8: Warnings and missed opportunities
  11. Staff Statement 17: Improvising a Homeland Defense
  12. 9/11 Commission, chapter 1: The four flights and emergency response
  13. 9/11 Investigation
  14. Supreme Court docket 25A1072
  15. World Trade Center Health Program statistics
  16. Saudi civil litigation — stay pending appeal — 03 MDL 1570 (GBD) (SN); associated 1:03-cv-09848, document 747, pp. 1–2, 4–6
  17. Trial for accused mastermind of 9/11 attacks set for June 2028
  18. 9/11 Commission — Heroism and Horror — Chapter 9, sections 9.1–9.2
  19. Mike Day recalls the maritime evacuation — Interview: call for boats; civilian mariners; dedicated routes
  20. Flight 93 — crew and passengers — Public roster; selected entries linked individually below
  21. Flight 93 — historical questions and answers — Telephone calls, resistance, target and crash
  22. NIST WTC 7 investigation — questions and answers — Questions 6 and 8–10: probable collapse sequence and water supply
  23. CIA: release of 71 presidential intelligence briefs — CIA: release of 71 presidential intelligence briefs
  24. 9/11 Commission, chapter 11: failures of imagination — 9/11 Commission, chapter 11: failures of imagination
  25. CIA intelligence brief: Drug-financing allegation — Collection PDF page 43
  26. 9/11 Commission, chapter 5: financing — 9/11 Commission, chapter 5: financing
  27. CIA intelligence brief: Determined to strike in the U.S. — Collection PDF page 94
  28. CIA intelligence brief: First post-attack situation report — Collection PDF page 98

AI generated report by Explorvia.com.