Prelude 9/11 morning Flight 11 hijacked Flight 175 hijacked WTC 1 hit Flight 77 hijacked WTC 2 hit Flight 93 hijacked Pentagon hit WTC 2 collapses Flight 93 crashes WTC 1 collapses WTC 7 collapses Epilogue

NTSB (accidents)

The National Transportation Safety Board released in August 2006 complete transcripts of the four planes’ communication with the Air Traffic Control, and detailed analyses of three of the planes’ routes.

Transcripts of recordings

Government Releases Detailed Information on 9/11 Crashes
Complete Air-Ground Transcripts of Hijacked 9/11 Flight Recordings Declassified
National Security Archive Electronic Briefing Book No. 196

  1. “Flight Path Study-American Airlines Flight 11,” Feb. 19, 2002
    [Chapter 1, The 9/11 Commission Report, “We Have Some Planes.” Footnotes 23, 33]
  2. “Flight Path Study-American Airlines Flight 77,” Feb. 19, 2002
    [Chapter 1, The 9/11 Commission Report, “We Have Some Planes.” Footnote 53]
  3. “Flight Path Study-United Airlines 175,” Feb. 19, 2002
    [Chapter 1, The 9/11 Commission Report, “We Have Some Planes.” Footnote 41]
  4. “Specialist’s Factual Report of Investigation-Digital Flight Data Recorder” for United Airlines Flight 93, Feb. 15, 2002
    [Chapter 1, The 9/11 Commission Report, “We Have Some Planes.” Footnotes 70, 71]
  5. Air Traffic Control Recording-American Airlines Flight 11, Dec. 21, 2001
    [Chapter 1, The 9/11 Commission Report, “We Have Some Planes.” Footnote 24]
  6. Air Traffic Control Recording-American Airlines Flight 77, Dec. 21, 2001
    [Chapter 1, The 9/11 Commission Report, “We Have Some Planes.” Footnote 54]
  7. Air Traffic Control Recording-United Airlines Flight 175, Dec. 21, 2001
    [Chapter 1, The 9/11 Commission Report, “We Have Some Planes.” Footnotes 24, 41, 42, 44]
  8. Air Traffic Control Recording-United Airlines Flight 93, Dec. 21, 2001
    [Chapter 1, The 9/11 Commission Report, “We Have Some Planes.” Footnote 71]
  9. Radar Data Impact Speed Study, American Airlines Flight 11, United Airlines Flight 175

Reports from NTSB about the planes

Flight 11 PDF Report(s) (Published):

Event Date: 09-11-2001
Location: New York City, NY
Make/Model: Boeing 767-200ER
Regist. Number: N334AA
NTSB No.: DCA01MA060
Event Severity: Fatal(92)
Air Carrier: American Airlines

Flight 175 PDF Report(s) (Published):

Event Date: 09-11-2001
Location: New York City, NY
Make/Model: Boeing 767-200ER
Regist. Number: N612UA
NTSB No.: DCA01MA063
Event Severity: Fatal(65)
Air Carrier: United Airlines

Flight 77 PDF Report(s) (Published):

Event Date: 09-11-2001
Location: Arlington, VA
Make/Model: Boeing 757-200
Regist. Number: N644AA
NTSB No.: DCA01MA064
Event Severity: Fatal(64)
Air Carrier: American Airlines

Flight 93 PDF Report(s) (Published):

Event Date: 09-11-2001
Location: Shanksville, PA
Make/Model: Boeing 757
Regist. Number: N591UA
NTSB No.: DCA01MA065
Event Severity: Fatal(44)
Air Carrier: United Airlines

Flight data recorder

Flight 77
Flight 93

The Investigative Process at NTSB

Read more about the methodology used by NTSB, when investigating accidents.

Among these: