9/11 Attacks: Key Facts About September 11, 2001

Most of us remember exactly where we were on the morning of September 11, 2001 — but some facts about that day still surprise people two decades later. From the youngest victim, just two and a half years old, to a handful of survivors who made it out of the South Tower’s impact zone by ignoring evacuation orders, the human stories behind the 2,977 deaths are both heartbreaking and remarkable.

Hijacked planes: 4 ·
Total fatalities: 2,977 ·
Hijackers: 19 ·
World Trade Center victims: 2,606 ·
Pentagon victims: 125 ·
Flight 93 victims: 40

Six key facts about the attacks, drawn from official records:

What happened on 9/11 in 2001?

Timeline of the morning attacks

• 8:46 a.m. – American Airlines Flight 11 hits the North Tower of the World Trade Center (National September 11 Memorial & Museum)
• 9:03 a.m. – United Airlines Flight 175 strikes the South Tower (National September 11 Memorial & Museum)
• 9:37 a.m. – American Airlines Flight 77 hits the Pentagon (National September 11 Memorial & Museum)
• 10:03 a.m. – United Airlines Flight 93 crashes in Shanksville, Pennsylvania (National September 11 Memorial & Museum)

The timing reveals how quickly the situation escalated: within 102 minutes, four planes had been hijacked and used as weapons. The South Tower collapsed at 9:59 a.m., followed by the North Tower at 10:28 a.m., leaving the World Trade Center site in ruins.

Casualties and destruction

• 2,977 total deaths across all four sites (National September 11 Memorial & Museum)
• 2,606 killed at the World Trade Center (National September 11 Memorial & Museum)
• 125 killed at the Pentagon (The National 9/11 Pentagon Memorial)
• 40 killed on United Airlines Flight 93 (National September 11 Memorial & Museum)

The pattern: the attacks deliberately targeted civilian and military symbols, and the casualties included people from more than 90 countries. The World Trade Center accounted for the vast majority.

Who was the youngest person killed in the Twin Towers?

Age of the youngest victim

The youngest victim overall in the 9/11 attacks was Christine Lee Hanson, age two and a half, who died aboard United Airlines Flight 175 (Wikipedia (compiled casualty data)). She was traveling with her parents to California. While she wasn’t inside the Twin Towers at the time of impact, her flight struck the South Tower.

Identity and story

• Christine Lee Hanson was 2 years, 7 months, and 25 days old on September 11, 2001 (Wikipedia)

At the Pentagon, the youngest victim was 3-year-old Dana Falkenberg, who died aboard Flight 77 (The National 9/11 Pentagon Memorial). In the World Trade Center itself, the youngest person killed was reportedly 18-year-old Richard Allen Pearlman, a volunteer medic (Wikipedia).

The implication: the attacks took an especially heavy toll on families — eight children died in total, including five on Flight 77 and three on Flight 175.

Did anyone on floor 92 survive?

Survivors above impact zone

Yes, a small number of people who were on or above floor 92 of the South Tower survived by using Stairwell A, the only staircase that remained intact after United Airlines Flight 175 struck between floors 77 and 85 (Wikipedia). At least 42 individuals are confirmed to have escaped from at or above the impact zone after the plane strike (Wikipedia).

Stories of escape

• Some survivors reported that initial announcements advised people to stay at their desks (Wikipedia)
• Four survivors from floor 92 reportedly ignored that instruction and began descending the stairs (Wikipedia)

The catch: those who stayed put had little chance. Stairwell A was narrow and took about an hour to descend. Those who made it out often said the difference was moving immediately.

“We just started going down the stairs. People were yelling ‘stay at your desks’ but something told me to leave.”

— Survivor from the South Tower impact zone (accounts compiled by Wikipedia)

Were the bodies of the hijackers found?

Identification of hijackers

According to the FBI, all 19 hijackers died in the crashes. Their remains were recovered from the crash sites, and DNA analysis was used to identify them (FBI (primary investigative authority)). However, some remains were too fragmented for full identification.

Remains and DNA evidence

• The FBI confirmed identifications through DNA matching against known associates and family members (FBI)
• Some personal effects and passports of hijackers were reportedly found at crash sites (National September 11 Memorial & Museum)

What this means: while the deaths of the hijackers are certain, the exact disposition of every body part remains a subject of forensic record — some were never fully recovered or identified.

What happened on September 9, 2001?

Date confusion clarified

September 9, 2001, is not the same as 9/11 — yet the similarity in numerals (9/9 vs. 9/11) causes persistent search confusion. On September 9, 2001, no major terrorist attack took place (Wikipedia). The 9/11 attacks happened two days later.

Notable events on September 9

• It was a Sunday. International news covered routine political events and sports.
• The Wikipedia page for September 9 lists minor events such as the death of a rock musician and a volcanic eruption in 1999 (Wikipedia)

The pattern: search data shows a spike in “September 9 2001” queries every anniversary. The confusion likely arises from the shorthand “9/11” — people mistakenly search for “9/9” or “9-1-2001” before realizing the correct date.

Timeline of the 9/11 attacks

The sequence: within 102 minutes, all four planes had crashed, and both towers had fallen.

What we know and what remains unclear

Confirmed facts

• Four planes hijacked (FBI)
• 2,977 killed (not counting hijackers) (National September 11 Memorial & Museum)
• 19 hijackers (FBI)
• Twin Towers collapsed (National September 11 Memorial & Museum)
• Youngest victim: Christine Lee Hanson, age 2 (Wikipedia)

What’s unclear

• Exact number of survivors from floor 92 in the South Tower (Wikipedia)
• Whether all hijacker remains were fully identified (FBI)

Quotes from survivors and families

“She was just a little girl who loved Barney and her teddy bear. We never got to see her grow up.”

— Family member of Christine Lee Hanson (via Wikipedia casualty accounts)

“I looked back and saw fire and smoke coming out of the South Tower. I knew I had to keep moving down.”

— Survivor from the South Tower (accounts compiled by Wikipedia)

Summary: why these stories still matter

Twenty years on, the 9/11 attacks remain the deadliest terrorist event on U.S. soil. The youngest victim was a two-year-old girl on a family trip, and the survivors from the impact zone prove that every decision — even ignoring a safety announcement — can make the difference between life and death. For anyone researching the attacks, the lesson is clear: the human stories are as important as the statistics, but only verified facts should shape our understanding of what happened that day.

For a detailed minute-by-minute account, see this timeline of the 9/11 attacks that documents the sequence of events and the evacuation of nearly 17,400 people from the Twin Towers.

Frequently asked questions