United Airlines Flight 77

United Airlines Flight 77
Occurrence type	Hijacking
Date	September 11, 2001
Summary	Terrorist hijacking and deliberate crash into the Pentagon
Site	Arlington, Virginia, United States
Aircraft type	Boeing 757-222
Operator	United Airlines
Tail number	N617UA
Origin	Dulles International Airport
Destination	Los Angeles International Airport
Occupants	64
Passengers	58
Fatalities	64

United Airlines Flight 77 was a scheduled transcontinental flight from Dulles International Airport to Los Angeles International Airport that was hijacked on September 11, 2001, and deliberately crashed into the Pentagon in Arlington County, Virginia. The hijacking formed part of the coordinated terrorist attacks of September 11, 2001 carried out by members of al-Qaeda, resulting in the deaths of all 64 people on board and additional casualties at the Pentagon. The event is linked closely with the broader series of attacks that included American Airlines Flight 11, United Airlines Flight 175, and American Airlines Flight 77—each connected to key sites such as the World Trade Center and national symbols like the Pentagon. Investigations by agencies including the Federal Bureau of Investigation, the National Transportation Safety Board, and the Department of Defense established a sequence of events and evidence tying the hijackers to Osama bin Laden's network.

Flight overview

The flight was operated by United Airlines using a Boeing 757 as a regularly scheduled service between major hubs Dulles International Airport and Los Angeles International Airport, with crew and passenger composition documented by Federal Aviation Administration records, United States Secret Service briefings, and airline manifests. On the morning of September 11, 2001, the flight was delayed at runway procedures and cleared for departure under control of air traffic controllers at the Potomac TRACON and Washington Air Route Traffic Control Center. The flight's diversion from planned routing and sudden altitude changes were recorded on air traffic control radar feeds, flight data recorder-type reconstructions, and eyewitness accounts from personnel at Dulles Tower, Ronald Reagan Washington National Airport, and nearby military installations.

Aircraft and crew

The aircraft, a Boeing 757-200 registered N617UA, was delivered new to United Airlines and maintained according to logs overseen by Federal Aviation Administration inspectors and airline maintenance teams. The cockpit crew included a captain and first officer whose careers intersected with professional organizations such as the Air Line Pilots Association and training conducted at flight simulators used by major carriers. Cabin crew members were employed by United Airlines and had training influenced by federal standards issued by the Department of Transportation and Transportation Security Administration policies that evolved after 9/11. The passenger manifest included citizens of multiple countries, with identities confirmed by coordination among the FBI, Defense Intelligence Agency, and international consulates.

Hijacking and timeline

Shortly after takeoff, five assailants identified by names presented in the 9/11 Commission Report seized control of the aircraft, using weapons and tactics consistent with other September 11 operations attributed to al-Qaeda operatives trained in Afghanistan and Germany. Communications intercepts, phone calls to family recorded by the FBI, and cockpit voice recorder reconstructions compiled by the National Transportation Safety Board and the 9/11 Commission established a timeline from boarding at Dulles International Airport through the breach of the cockpit and subsequent course changes. Air traffic control transcripts from the Potomac TRACON and military radio logs from North American Aerospace Defense Command show attempts to intercept or identify the aircraft before impact; these are cross-referenced in investigations by the House Committee on Homeland Security and the 9/11 Commission.

Impact and crash site

At 9:37 a.m., the aircraft struck the western side of the Pentagon, causing a fireball and structural collapse in the E-ring section, with damage documented by United States Army engineers, National Institute of Standards and Technology, and Department of Defense damage assessments. The collision destroyed sections of the Pentagon's facade, severed critical infrastructure including portions of the Pentagon Reservation and the Defense Intelligence Agency-adjacent facilities, and resulted in military and civilian casualties among personnel from organizations such as the Joint Chiefs of Staff and agencies housed within the building. Emergency response involved units from the Arlington County Fire Department, the Fairfax County Fire and Rescue Department, and federal law enforcement agencies coordinating at the Pentagon Emergency Operations Center.

Investigation and evidence

Investigations led by the FBI collected wreckage, analyzed flight data, and assembled forensic evidence including DNA samples processed at federal facilities and corroborated by international consulates and the Department of Defense's mortuary affairs. The NTSB and the 9/11 Commission synthesized radar tracks, telephone call records, cockpit voice recorder audio, and eyewitness testimony to reconstruct the aircraft's flight path and the hijackers' actions. Physical evidence at the impact site, structural analysis by American Society of Civil Engineers-linked experts, and intelligence obtained by the Central Intelligence Agency and military intelligence communities established links between the hijackers and al-Qaeda leadership, informing subsequent military operations in Afghanistan and policy changes implemented by the Homeland Security Act reforms.

Victims and memorials

All 64 occupants of the aircraft perished, alongside 125 military and civilian personnel inside the Pentagon; victim identities were confirmed through interagency cooperation involving the FBI, Defense POW/MIA Accounting Agency, and international missions. Memorials include the Pentagon Memorial near the crash site, which honors the passengers and Pentagon victims, and national commemorations held by institutions such as the National September 11 Memorial & Museum and annual observances involving the United States Congress and presidential statements. The event prompted policy and institutional changes across agencies like the Transportation Security Administration, Department of Defense, and National Security Council, and continues to be memorialized in works by authors, filmmakers, and organizations documenting the September 11 attacks.

Category:September 11 attacks