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 8:46 AM: Flight 11 crashes into the WTC (World
Trade Center) north tower.
8:46:40:
Flight 11 crashes at roughly 490 mph (790 km/h) into the north side of
the north tower of the World Trade Center, between floors 94 and 98.
The aircraft enters the tower mostly intact. It plows to the building
core, severing all three gypsum-encased stairwells, dragging
combustibles with it. A massive shock wave travels down to the ground
and up again. The combustibles and the remnants of the aircraft are
ignited by the burning fuel. Since the building lacks a traditional
full cage frame and depends almost entirely on the strength of a narrow
structural core running up the center, the fire at the center of the
impact zone is in a position to compromise the integrity of all
internal columns. Two home video cameras are known to have recorded the
impact. People below the severed stairwells in the north tower start to
evacuate; no-one above the impact zone is able to do so.
8:46
to 10:29: At least 100 people (some accounts say as many as 250),
primarily in the north tower, trapped by fire and smoke in the upper
floors, jump to their deaths. There is some evidence that large central
portions of the floor near the impact zone in the north tower collapsed
soon after the plane hit, perhaps convincing some people that total
collapse was imminent. One person at street level, firefighter Daniel
Thomas Suhr, is hit by a jumper and dies. No form of airborne
evacuation is attempted as smoke is too dense for a successful landing
on the roof of either tower.
9:03 AM: Flight 175 crashes into the south WTC
tower.
9:03:13:
Flight 175 crashes at about 590 mph (950 km/h) into the south side of
the south tower, banked between floors 78 and 84. By this time, several
media organizations are covering the first plane crash; millions see
the impact live. Parts of the plane leave the building at its east and
north sides, falling to the ground six blocks away. A massive
evacuation begins in the south tower below its impact zone. One of the
stairwells in the south tower remains unblocked, but filled with smoke.
This led many people to mistakenly go upwards towards the roof for a
rooftop rescue that never came. CNN's headline now reads 'Second plane
crashes into World Trade Center'.
9:59 AM: The south tower of the World Trade
Center collapses.
9:59:04:
The south tower of the World Trade Center collapses, viewed and heard
by a vast television and radio audience. It had stood for 56 minutes 10
seconds since the impact by Flight 175. As the roar of the collapse
goes silent, tremendous gray-white clouds of pulverized concrete and
gypsum rush through the streets. Most observers think a new explosion
or impact has produced smoke and debris that now obscures the south
tower. When the wind finally clears the immediate space, it is plain to
see that there is no tower.
10:28 AM: The World Trade Center north tower
collapses.
10:28:31:
The north tower of the World Trade Center collapses from the top down,
as if being peeled apart. Probably due to the destruction of the
gypsum-encased stairwells on the impact floors (most skyscraper
stairwells are encased in reinforced concrete), no one above the impact
zone in the north tower survives. The Marriott Hotel, located at the
base of the two towers, is also destroyed. The second collapse is also
viewed live on television and heard on radio.
The
north tower, 1 WTC, stood for 102 minutes 5 seconds after impact. The
south tower, 2 WTC, collapsed about 56 minutes later.
Each
of the WTC towers had 110 stories. Tower One (the North Tower, which
featured a massive 360 foot high TV antenna added in 1978) stood 1,368
feet (417 m) high, and Tower Two (the South Tower, which contained the
observation deck) was 1,362 feet (415 m) high. The length and breadth
of the towers were 208 feet (63.4 m) x 208 feet (63.4 m). Although only
Tower 1 featured an antenna, the structure of both buildings were
designed to carry a broadcast mast.
Of
the 110 stories, eight were set aside for technical services
(mechanical floors), in four two-floor areas evenly spread up the
building. All the remaining floors were free for open-plan offices.
Each tower had 3.8 million square feet (350,000 mª) of office
space.
The
complex, located in the heart of New York City's downtown financial
district, contained 13.4 million square feet (1.24 million mª) of
office space, almost four percent of Manhattan's entire office
inventory. During the 1990s some 500 companies, especially financial
firms, had offices in the complex, including Morgan Stanley, Aon
Corporation, Salomon Brothers, and the Port Authority itself.
Each floor of the Twin Towers was approximately
one acre in size.
When the Towers collapsed they fell nearly
¼ of a mile to earth, and reached a speed of 120 miles per hour.
The towers were struck by hijacked Boeing 767
jet planes, American Airlines Flight 11 and United Airlines Flight 175.
A
typical Boeing 767 is 180 feet (55 m) long and has a wingspan of 156
feet (48 m), with a capacity of up to 24,000 US gallons (91,000 l) of
jet fuel.
The
planes hit the towers at very high speeds. Flight 11 was traveling
roughly 490 mph (790 km/h) when it crashed into the 1 WTC, the north
tower; flight 175 hit 2 WTC, the south tower, at about 590 mph (950
km/h).
The
resulting explosions in each tower ignited 10,000 gallons (c. 40,000 l)
of jet fuel and immediately spread the fire to several different floors
while consuming paper, furniture, carpeting, computers, books, walls,
framing and other items in all the affected floors.
The
jet fuel probably burned out in less than 10 minutes; the contents of
the buildings burned over the next hour or hour and a half, according
to the lead investigator of the NIST investigation.
2,749 death certificates were filed relating to
the WTC attacks, as of February 2005.
13
people died after the disaster, from injuries received on September 11;
three of these people died in Massachusetts, Missouri, and New Jersey,
and the rest died in New York.
Of the 2,749 people who died, 2,117 (77%) were
males and 632 (23%) were females.
 1,588
(58%) were forensically identified from recovered physical remains.
The
median age for the victims was 39 years (range: 2-85 years); the median
age was 38 years for females (range: 2-81 years) and 39 years for males
(range: 3-85 years). Three people were aged under 5 years, and three
were aged over 80 years.
In all, 343 firefighters died in the Trade Center
disaster, along with
23 New York City and 37 Port Authority police officers and six medical
rescue workers.
People from 83 different countries died in the
attacks on the World Trade Center.
For more complete statistics on the World Trade
Center loss of life, visit this site: September 11th, 2001 Victims
The
youngest passenger on the hijacked jets was Christine Hanson on United
Airlines Flight 175. She was 2 and on her first trip to Disneyland.
The oldest passenger on the hijacked jets was
Robert Norton on American Airlines Flight 11. He was 82.
The
New York City Fire Department lost 343 firefighters, almost half the
number of on-duty deaths in the department's 100-year history.
The
south tower collapsed at a magnitude of 2.1 on a seismograph; the north
tower collapsed with a magnitude of 2.3, according to Columbia
University in New York.
91
baseball games were postponed in the six days Major League Baseball
suspended play, the longest postponement, excluding work stoppages, for
regular-season games since World War I in 1918.
Sirius,
one of the first bomb-sniffing K-9 dogs stationed near the World Trade
Center after the 1993 terrorist bombing, died in the Sept. 11 attacks.
Fifteen
million square feet of office space was lost at the WTC, more than
three times the amount of space at the Sears Tower in Chicago. 1,430
people with 50,000 employees from 26 countries called the WTC "the
office."
1,337
vehicles were crushed when the towers collapsed, including 91 FDNY
vehicles - a little more than half of all the fire vehicles in
Louisville.
1.5 million working hours during 261 days were
spent removing the debris at the WTC site.
Seven
in 10 Americans say they have experienced depression since the attacks.
New York State Office of Mental Health estimates more than 33,000
showed symptoms of post-traumatic stress disorder.
America's
Blood Centers, a network of community banks, collected 251,370 units,
nearly three times the normal intake, in the four days after Sept. 11.
The Red Cross collected more than 200,000 units and saw its on-hand
supply nearly double, from 80,000 units to 156,000 units in days.
The fires at Ground Zero burned for 99 days,
until Dec. 19.
Source of this information is from www.wtc911.us
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