At 7:59 A.M., American Airlines Flight 11, a Boeing 767 with 92 people on board, departed Boston's Logan International Airport bound for Los Angeles International Airport. At 8:40 A.M., the FAA notified NORAD's Northeastern Air Defense Sector of the suspected hijacking of Flight 11. At 8:46 A.M., Flight 11 crashed into the north tower, WTC 1, and FDNY Battalion 1 Chief witnessed the impact, immediately requested resources, and proceeded to the World Trade Center. At 8:50 A.M., Battalion 1 arrived at WTC 1 and established the Incident Command Post in the lobby according to FDNY's high-rise firefighting procedures. At 9:00 A.M., the Incident Commander moved the Incident Command Post from the lobby of WTC 1 to the far side of West Street because of the increasing risk from falling debris within and around the lobby; chief officers considered a limited, localized collapse of the towers possible, but did not think either tower would collapse entirely. At 9:03 A.M., United Airlines Flight 175 crashed into the south tower, WTC 2. At 9:16 A.M., the corner of West and Albany Streets, two blocks south of the World Trade Center, was designated as the staging area for WTC 2. At 9:29 A.M., all off-duty firefighters and officers were recalled, and the recall order was broadcast by public media outlets and dispatched across FDNY radio channels; thousands of off-duty firefighters and EMS personnel left their families to help the City and the Department respond to the attacks. At 9:59 A.M., WTC 2 collapsed with civilians and first responders inside, destroying the Incident Command Post on West Street and the Field Communications Unit. At 10:28 A.M., WTC 1 collapsed, seriously impairing incident command and control. Efforts to re-establish it were complicated because dispatch and the staff chiefs were unable to determine which chiefs had survived the collapses, where they were, what resources were available in different sectors of the incident area, whether there was an Incident Command Post, and who the Incident Commander was; radio communications were also difficult because of the large number of transmissions, including attempts to locate personnel, mayday calls, and company units seeking orders. At 11:28 A.M., the Incident Command Post was re-established.
