United Airlines Flight 175 was on September 11, 2001 the commercial air service between Boston (Massachusetts) and Los Angeles (California) United States, the Boeing 767-200ER (registration N612UA). He took off at 8 am 14, with 16 minutes behind schedule. At 8 h 37, the air traffic controller asked the pilots if they saw the American Airlines Flight 11, and the answer (yes) was the last radio contact. According to the Kean commission, he left his route to 8 pm 42 and cut off its transponder at 8 pm 46. But according to the NTSB, it appears to have been diverted to 8 pm 47 and out of his way to 8 pm 51. He made a U-turn at 8 h 52 before crashing into the south tower of World Trade Center in New York at 9 pm 03. If he had departed on time, he reached his target to 8 h 47, at the same time American Airlines Flight 11. It was carrying 56 passengers and 9 crew members. 
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Impact (South Tower - WTC 2)
At 9 h 03, Flight 175 penetrated through (15 °) south-west face of the south tower, about seven meters from the center. The event has been widely recorded by broadcasters who covered the attack against the North Tower.
Marwan Yousef al-Shehhi (مروان الشحي) (pilot), born May 9, 1978 in Ras Al Khaimah in the UAE is a member of al Qaeda.
Mohand al-Shehri (مهند الشهري), born July 5, 1979 at Asir in Saudi Arabia is a member of al-Qaida. Fayez Rashid Ahmed
Hassan al Qadi Banihammad (فايز راشد احمد حسن القاضي بني حمد) born in the United Arab Emirates
Ahmed Salah al-Ghamdi (احمد الغامدي)
Hamza al-Ghamdi (حمزة الغامدي)
Impact (South Tower - WTC 2)
At 9 h 03, Flight 175 penetrated through (15 °) south-west face of the south tower, about seven meters from the center. The event has been widely recorded by broadcasters who covered the attack against the North Tower.
According to the report published by FEMA, the speed of the aircraft was estimated at 870 km / h, which gave him 50% more energy than the flight AA11. But, hitting the tower between floors 78 and 83, he left an imprint shorter (26 meter wingspan) despite a greater angle of heel (38 °) at this level because the external structure was (twice) more resistant than at stage 95.
The angle of the direction of flight was only half the starboard of the aircraft could not meet the internal structure of the support columns, allowing the engine parts, train landing and cabin out by the angle of the building and be found up to four hundred meters away.
The plane section twenty-five columns of the outer structure (eleven per floor on average, 5% of the circumference), damages which must be added those made in the eastern corner by the output bits of engine and train human . The impression left by the plane had a surface very similar to that of WTC1. The damage to the central structure are equally unknown as those of the north tower, at least one stairway remained passable.
The angle of impact was that the kerosene from the right wing came out through the facades of three huge fireballs. It followed that the fire was far less consequential than the North Tower and remained very localized at the eastern corner with an unusual phenomenon, however, mentioned by NIST: shortly before the collapse was recorded intense flash of light followed, several minutes during , a flow of molten metal.
team of firefighters had reached the 78th floor had reported the presence of two residual fires and requested the dispatch of nozzles for extinguishing them. A few minutes later, the tower collapsing could be passed before the evacuation order issued by the emergency command post located in WTC 7. At least eighteen people who were in the upper floors had been able to cross easily between the time a disaster area by the stairs of one of three core services (which are grouped columns in the internal structure of support).
Minutes after the last communication with the team of firefighters who have reached the 78th floor, tended to the wounded and about to put two homes remaining, the Fire Chief Ganci received the messenger of the emergency office (OEM), Steve Moscillo. He was shocked to hear that "the buildings were collapsing and needed to evacuate" (interviewed by ABC News, Mayor Giuliani, a member of the OEM, acknowledged that he had only transmit this information and the origin of this projection remains unknown).
few minutes later, the section above the impact bowed south, a rotation which resulted in total loss of support of the internal structure, the resistance of the intact part of the external structure (the "tube"), but lower of the damaged area. Then, after an acceleration to an angle of about 25 °, this rotation ceased abruptly, leaving room for the development of a huge cloud "eruptive" which progressed to the same throughout the tour until his foot , heavy elements (several tens of tons) is projected at one hundred twenty meters away, the lighter to more than four hundred yards, the contents of floors (cement floors, plaster walls, furniture, equipment, human) being reduced to dust or fragments. Most of the remains were found and distributed around the base of the tower and surrounding buildings.
Fires
team of firefighters had reached the 78th floor had reported the presence of two residual fires and requested the dispatch of nozzles for extinguishing them. A few minutes later, the tower collapsing could be passed before the evacuation order issued by the emergency command post located in WTC 7. At least eighteen people who were in the upper floors had been able to cross easily between the time a disaster area by the stairs of one of three core services (which are grouped columns in the internal structure of support).
The collapse of the South Tower
Minutes after the last communication with the team of firefighters who have reached the 78th floor, tended to the wounded and about to put two homes remaining, the Fire Chief Ganci received the messenger of the emergency office (OEM), Steve Moscillo. He was shocked to hear that "the buildings were collapsing and needed to evacuate" (interviewed by ABC News, Mayor Giuliani, a member of the OEM, acknowledged that he had only transmit this information and the origin of this projection remains unknown). 
Position 2 bombings (World Trade Center):
Tours: 2595 deaths, including 343 firefighters New York, 23 NYPD officers, 37 police officers of the port.
AA11 Flight: 92 passengers, crew and terrorists. Flight UA175
: 65 passengers crew members and terrorists.
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