<sod>Four passenger [[airliner]]s—which all departed from airports on the [[East Coast of the United States|U.S. East Coast]] bound for [[California]]—were [[Aircraft hijacking|hijacked]] by [[Hijackers in the September 11 attacks|19 al-Qaeda terrorists]] to be flown into buildings. Two of the planes, [[American Airlines Flight 11]] and [[United Airlines Flight 175]], were crashed into the [[One World Trade Center#Original building (1970&ndash;2001)|North]] and [[Two World Trade Center#Original building (1971&ndash;2001)|South]] towers, respectively, of the [[World Trade Center (1973–2001)|World Trade Center]] complex in [[New York City]]. Within an hour and 42 minutes, both 110-story [[Collapse of the World Trade Center|towers collapsed]], with debris and the resulting fires causing partial or complete collapse of all other buildings in the World Trade Center complex, including the 47-story [[7 World Trade Center]] tower, as well as significant damage to ten other large surrounding structures. A third plane, [[American Airlines Flight 77]], was crashed into [[the Pentagon]] (the headquarters of the [[United States Department of Defense]]) in [[Arlington County, Virginia|Arlington County]], [[Virginia]], leading to a partial collapse in the Pentagon's western side. The fourth plane, [[United Airlines Flight 93]], initially was steered toward [[Washington, D.C.]], but crashed into a field near [[Shanksville, Pennsylvania|Shanksville]], [[Pennsylvania]], after its passengers tried to overcome the hijackers. In total, the attacks [[Casualties of the September 11 attacks|claimed the lives of 2,996 people]] (including the 19 hijackers) and caused at least $10 billion in property and infrastructure damage<ref name=cost>{{cite web|title=How much did the September 11 terrorist attack cost America?|url=http://www.iags.org/costof911.html|work=2004|publisher=Institute for the Analysis of Global Security|accessdate=2014-04-30}}</ref><ref name="PEARL9/11">{{cite book |title=The Impact of 9/11 on Politics and War: The Day that Changed Everything? |author=Matthew J. Morgan |page=222|date= August 4, 2009 |publisher=Palgrave Macmillan|isbn=0-230-60763-2}}</ref>  and $3 trillion in total costs.<ref>{{Cite web|title = One 9/11 Tally: $3.3 Trillion|url = http://www.nytimes.com/interactive/2011/09/08/us/sept-11-reckoning/cost-graphic.html|accessdate = 2015-09-14|first = Shan|last = Carter|first2 = A.|last2 = Cox}}</ref> It was the [[List of the deadliest firefighter disasters in the United States|deadliest incident for firefighters]] and [[Law enforcement in the United States|law enforcement officers]]<ref name="Congress">{{cite book|last=Congress|title=Congressional Record, Vol. 148, Pt. 7, May 23, 2002 to June 12, 2002|url=https://books.google.com/books?id=eCO7Q10SGBUC&pg=PA9909|accessdate=2014-04-09|publisher=Government Printing Office|page=9909|isbn=978-0-16-076125-6}}</ref> in the [[history of the United States]], with 343 and 72 killed respectively.<eod>
<sod>Four passenger [[airliner]]s—which all departed from airports on the [[East Coast of the United States|U.S. East Coast]] bound for [[California]]—were [[Aircraft hijacking|hijacked]] by [[Hijackers in the September 11 attacks|19 al-Qaeda terrorists]] to be flown into buildings. Two of the planes, [[American Airlines Flight 11]] and [[United Airlines Flight 175]], were crashed into the [[One World Trade Center#Original building (1970&ndash;2001)|North]] and [[Two World Trade Center#Original building (1971&ndash;2001)|South]] towers, respectively, of the [[World Trade Center (1973–2001)|World Trade Center]] complex in [[New York City]]. Within an hour and 42 minutes, both 110-story [[Collapse of the World Trade Center|towers collapsed]], with debris and the resulting fires causing partial or complete collapse of all other buildings in the World Trade Center complex, including the 47-story [[7 World Trade Center]] tower, as well as significant damage to ten other large surrounding structures. A third plane, [[American Airlines Flight 77]], was crashed into [[the Pentagon]] (the headquarters of the [[United States Department of Defense]]) in [[Arlington County, Virginia|Arlington County]], [[Virginia]], leading to a partial collapse in the Pentagon's western side. The fourth plane, [[United Airlines Flight 93]], initially was steered toward [[Washington, D.C.]], but crashed into a field near [[Shanksville, Pennsylvania|Shanksville]], [[Pennsylvania]], after its passengers tried to overcome the hijackers. In total, the attacks [[Casualties of the September 11 attacks|claimed the lives of 2,996 people]] (including the 19 hijackers) and caused at least $10 billion in property and infrastructure damage<ref name=cost>{{cite web|title=How much did the September 11 terrorist attack cost America?|url=http://www.iags.org/costof911.html|work=2004|publisher=Institute for the Analysis of Global Security|accessdate=2014-04-30}}</ref><ref name="PEARL9/11">{{cite book |title=The Impact of 9/11 on Politics and War: The Day that Changed Everything? |author=Matthew J. Morgan |page=222|date= August 4, 2009 |publisher=Palgrave Macmillan|isbn=0-230-60763-2}}</ref>  and $3 trillion in total costs.<ref>{{cite news|title = One 9/11 Tally: $3.3 Trillion|url = http://www.nytimes.com/interactive/2011/09/08/us/sept-11-reckoning/cost-graphic.html|accessdate = 2015-09-14|first = Shan|last = Carter|first2 = A.|last2 = Cox}}</ref> It was the [[List of the deadliest firefighter disasters in the United States|deadliest incident for firefighters]] and [[Law enforcement in the United States|law enforcement officers]]<ref name="Congress">{{cite book|last=Congress|title=Congressional Record, Vol. 148, Pt. 7, May 23, 2002 to June 12, 2002|url=https://books.google.com/books?id=eCO7Q10SGBUC&pg=PA9909|accessdate=2014-04-09|publisher=Government Printing Office|page=9909|isbn=978-0-16-076125-6}}</ref> in the [[history of the United States]], with 343 and 72 killed respectively.<eod>