United Airlines Flight 175
United Airlines Flight 175
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United Airlines Flight 175

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United Airlines Flight 175

United Airlines Flight 175 was an American domestic passenger flight from Logan International Airport in Boston to Los Angeles International Airport in California that was hijacked by five al-Qaeda terrorists on the morning of September 11, 2001, as part of the September 11 attacks. The aircraft involved, a Boeing 767-200 carrying 51 passengers and 9 crew members (excluding the 5 hijackers), was deliberately crashed into the South Tower of the World Trade Center in New York City, killing everyone aboard and causing the deaths of more than 600 people in the South Tower's upper levels in addition to an unknown number of civilians and emergency personnel on floors beneath the impact zone. Flight 175 is the second-deadliest plane crash in aviation history, surpassed only by American Airlines Flight 11.

Flight 175 departed from Logan Airport at 08:14. Twenty-eight minutes into the flight, the hijackers injured several crew members, forced their way into the cockpit, and murdered both pilots while moving anyone who remained to the rear of the aircraft. Lead hijacker Marwan al-Shehhi, who had trained as a pilot for the purposes of the attacks, was able to usurp the flight controls once the hijackers killed the captain and first officer. Unlike the team on American Airlines Flight 11, the terrorists aboard Flight 175 did not switch off the plane's transponder when they took over the cockpit. Thus, the aircraft was visible on New York Center's radar, which depicted the deviation from its assigned flight path before controllers took notice four minutes later at 08:51 EDT. Upon realizing, the ATC workers immediately made several unsuccessful attempts to contact the cockpit of the hijacked airliner, which twice nearly collided with other planes as it recklessly flew toward New York City. In the interim, three people were able to get through to their family members and colleagues on the ground, passing on information to do with the hijackers as well as casualties suffered by the flight crew.

No more than 21 minutes after the hijacking began, al-Shehhi crashed the airplane into the South Tower's south face from floors 77 through 85 as part of an attack coordinated with the takeover of Flight 11, which had struck the upper floors of the World Trade Center's North Tower at 08:46. Media coverage of the disaster that began in the North Tower 17 minutes earlier meant Flight 175's impact at 09:03 was the only one of the four attacks to be televised live around the world. The damage done to the South Tower by the crash and subsequent fire caused its collapse 56 minutes later at 09:59, killing everyone who was still inside. During the recovery effort at the World Trade Center site, workers uncovered and identified remains from some Flight 175 victims, but many victims have not been identified.

The flight was hijacked as part of the September 11 attacks. The team was assembled by al-Qaeda leader Osama bin Laden, who also provided the financial and logistical support, and was led by Khalid Sheikh Mohammed, who devised the plot. Bin Laden and Mohammed, along with the hijackers, were motivated by the US’s support for Israel and their intervention in the Middle East. The attacks were given the go ahead by bin Laden in late 1998 or early 1999. The World Trade Center was chosen as one of the targets due to it being a prominent American symbol that represented economic prowess.

The team of hijackers on United Airlines Flight 175 was led by Marwan al-Shehhi, originally from the United Arab Emirates with a stint in Hamburg, Germany, as a student. By January 2001, the pilot hijackers had completed their training; al-Shehhi obtained a commercial pilot license while training in South Florida, along with American Airlines Flight 11 hijacker Mohamed Atta and Flight 93 hijacker Ziad Jarrah. The hijackers on Flight 175 included Fayez Banihammad, also from the UAE, and three Saudis: brothers Hamza and Ahmed al-Ghamdi, as well as Mohand al-Shehri.

The hijackers were trained at an al-Qaeda camp called Mes Aynak in Kabul, Afghanistan, where they learned about weapons and explosives, followed by training in Karachi, Pakistan, where they learned about "Western culture and travel". Afterwards, they went to Kuala Lumpur, Malaysia, for exercises in airport security and surveillance. Part of the training in Malaysia included boarding flights operated by US carriers so they could observe pre-boarding security screenings, flight crew movements around the cabin, and the timing of cabin services.

A month before the attacks, Marwan al-Shehhi purchased two 4-inch (10.2 cm) pocket knives from a Sports Authority store in Boynton Beach, Florida, while Banihammad bought a two-piece "snap" utility knife set at a Wal-Mart, and Hamza al-Ghamdi bought a Leatherman Wave multi-tool. The hijackers arrived in Boston from Florida between September 7 and 9.

The flight was operated by a Boeing 767-200, registration number N612UA built and delivered to United Airlines in 1983. It had a capacity of 168 passengers (10 in first class, 32 in business class, and 126 in economy class). On the day of the attacks, the flight carried only 56 passengers and 9 crew, which represented a 33 percent load factor – well below the average load factor of 49 percent in the three months preceding September 11.

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