Timeline
2004 ----------------->2013
it took 9 years to build the 1 world trade center
• 8:19 am – Flight attendants aboard Flight 11 alert ground personnel that the plane has been hijacked; American Airlines notifies the FBI.• 8:24 am – Hijacker Mohammed Atta makes the first of two accidental transmissions from Flight 11 to ground control (apparently in an attempt to communicate with the plane’s cabin).
• 8:40 am – The Federal Aviation Administration (FAA) alerts North American Aerospace Defense Command (NORAD)’s Northeast Air Defense Sector (NEADS) about the suspected hijacking of Flight 11. In response, NEADS scrambles two fighter planes located at Cape Cod’s Otis Air National Guard Base to locate and tail Flight 11; they are not yet in the air when Flight 11 crashes into the North Tower.
• 8:46 am – Mohammed Atta and the other hijackers aboard American Airlines Flight 11 crash the plane into floors 93-99 of the North Tower of the World Trade Center, killing everyone on board and hundreds inside the building.
• 8:46 am – Mohammed Atta and the other hijackers aboard American Airlines Flight 11 crash the plane into floors 93-99 of the North Tower of the World Trade Center, killing everyone on board and hundreds inside the building.
• 9:02 am – After initially instructing tenants of the WTC’s South Tower to remain in the building, Port Authority officials broadcast orders to evacuate both towers via the public address system; an estimated 10,000 to 14,000 people are already in the process of evacuating.
• 9:03 am – Hijackers crash United Airlines Flight 175 into floors 75-85 of the WTC’s South Tower, killing everyone on board and hundreds inside the building
• 9:37 am – Hijackers aboard Flight 77 crash the plane into the western façade of the Pentagon in Washington, D.C., killing 59 aboard the plane and 125 military and civilian personnel inside the building.
• 9:59 am – The South Tower of the World Trade Center collapses.
• 10:07 am – After passengers and crew members aboard the hijacked Flight 93 contact friends and family and learn about the attacks in New York and Washington, they mount an attempt to retake the plane. In response, hijackers deliberately crash the plane into a field in Somerset County, Pennsylvania, killing all 40 passengers and crew aboard.
• 10:28 am – The World Trade Center’s North Tower collapses, 102 minutes after being struck by Flight 11.
I got this from http://www.history.com/topics/9-11-timeline