PETERSON AFB, Colo. -- The following timelines show NORAD’s response to the airliner hijackings on September 11, 2001.

* All times are Eastern Daylight Time; NEADS = North East Air Defense Sector, NORAD

** Scramble = Order to get an aircraft airborne as soon as possible

*** Estimated = loss of radar contact

**** Flight times are calculated at 9 miles per minute or .9 Mach

***** The FAA and NEADS established a line of open communication discussing AA Flt 77 and UA Flt 93

American Airlines Flight 11

Boston enroute to Los Angeles  FAA Notification to NEADS  Fighter Scramble Order Otis Air National Guard Base, Falmouth, Mass. Two F-15s  Fighters Airborne  Airline Impact Time World Trade Center 1  Fighter Time/Distance from Airline Impact Location

--  8:40 * --  8:46 ** --  8:52 --  8:46 estimated *** --  Aircraft not airborne / 153 miles

United Airlines Flight 175

Boston enroute to Los Angeles  FAA Notification to NEADS  Fighter Scramble Order Otis ANGB, Falmouth, Mass. Same 2 F-15s as Flight 11  Fighters Airborne  Airline Impact Time World Trade Center 2  Fighter Time/Distance from Airline Impact Location

--  8:43 --  8:46 --  8:52 --  9:02 estimated --  approx 8 min **** / 71 miles

American Flight 77

Dulles enroute to Los Angeles  FAA Notification to NEADS  Fighter Scramble Order Langley AFB, Hampton, Va. 2 F-16s  Fighters Airborne  Airline Impact Time Pentagon  Fighter Time/Distance from Airline Impact Location

--  9:24 * --  9:24 ** --  9:30 --  9:37 estimated --  approx 12 min / 105 miles

United Flight 93

Newark to San Francisco  FAA Notification to NEADS  Fighter Scramble Order Langley F-16s already airborne for AA Flt 77  Fighters Airborne Langley F-16 CAP remains in place to protect DC  Airline Impact Time Pennsylvania  Fighter Time/Distance from Airline Impact Location

--  N/A ***** --    --    --  10:03 estimated --  approx 11 min / 100 miles from DC F-16 CAP