911 work- Timeline

(6:20 a.m.-6:53 a.m.) September 11, 2001: Two Flight 175 Hijackers Check in at United Airlines Ticket Counter; Uncertainty Over Their Identities

(6:30 a.m.-12:00 p.m.) September 11, 2001: Radar Located in Northeast US Offline for Repair Work

6:45 a.m. September 11, 2001: Connecting Flight for Two 9/11 Hijackers Arrives in Boston

6:47 a.m. September 11, 2001: WTC Building 7 Alarm Not Operating

(7:03 a.m.-7:48 a.m.) September 11, 2001: Flight 93 Hijackers Check in at Airport and Board Plane; Only One Selected for Additional Screening

(7:25 a.m.-7:36 a.m.) September 11, 2001: Remaining Three Flight 77 Hijackers Check in at Airport; Allowed to Board despite Security Checkpoint Problems

7:40 a.m. September 11, 2001: Flight 11 Pushes Back from Gate; Reports Conflict over Which Gate It Leaves From

(Before 7:59 a.m.) September 11, 2001: Inter Flight Phone Call Between Hijackers

(7:59 a.m.) September 11, 2001: Flight 11 Is Late Taking Off

(Early Morning) September 11, 2001: Langley Pilot Asks to Be Taken off Alert Later On

(Early Morning) September 11, 2001: NEADS Threat Briefing Includes No Indication of Increased Terrorist Threat

(8:00 a.m.-8:50 a.m.) September 11, 2001: Defense Secretary Rumsfeld Holds Breakfast Meeting at Pentagon; Key Military Figures Present

8:13 a.m. September 11, 2001: Flight 11 Makes Its Last Communication with Air Traffic Control

(Between 8:13 a.m. and 8:21 a.m.) September 11, 2001: Flight 11 Transponder Turned Off

(8:13 a.m.-9:28 a.m.) September 11, 2001: Pilots of All Four Hijacked Planes Fail to Dial Standard Distress Code

(8:14 a.m.) September 11, 2001: Boston Airport Control Tower Contacted about Flight 11 Problems; Employee Concerned about Possibility of Hijacking

8:19 a.m. September 11, 2001: Flight 11 Attendant Ong Phones in Hijack Report, Officials Doubt Validity

(8:20 a.m.) September 11, 2001: Flight 11 Veers Off Course

8:25 a.m. September 11, 2001: Boston Flight Control Tells Other Centers about Hijack, but Not NORAD

8:27 a.m. September 11, 2001: Radar Shows Helicopter Apparently Crashing into WTC, but turns out to be flight 11.

8:30 a.m. September 11, 2001: Firefighters Who Later Respond to Pentagon Attack Are Attending Antiterrorism Training

8:30 a.m. September 11, 2001: Washington Police Unit Holding Training Event for Upcoming IMF and World Bank Meetings

(Between 8:30 a.m. and 8:40 a.m.) September 11, 2001: FAA Boston Center Supervisor Alerts Otis Air Base Tower to Flight 11, Requests Fighters

8:46 a.m. September 11, 2001: Flight 11 Hits the North Tower of the World Trade Center

9:03 a.m. Hijackers crash 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.

10:15  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

11:30 -- Before sleeping, President Bush enters into his journal: "The Pearl Harbor of the 21st century took place today...We think it's Osama bin Laden."