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Claims cell phone calls were impossible

During the flight of United 93 passengers are said to have made a number of calls to both family and emergency personnel. It is argued by some that connecting a cell phone to a tower's signal would have been near to impossible from the air. Based on this information, some theorists suggest the calls were fabricated or never made at all.[citation needed]

* In 2003 a Canadian team conducted experiments to determine if cell phones could be used from civilian aircraft flying at cruising speeds and altitudes. [94] Their findings concluded the probability of a typical cell phone making a stable connection to a cell on the ground is roughly .006% from the altitude that Flight 93 was supposedly flying at at the time of the cell phone calls. Anecdotal evidence provided to the team by airline passengers in other parts of the US and the world corroborates their findings.

7 World Trade Center collapsed at 5:20 pm EDT in the evening of Sept 11, 2001.

Similar to the Towers One and Two theories, 9/11 researchers have proposed the idea Building Seven collapsed as the result of a controlled demolition. The basis for the demolition theory came from the visual observations of the collapse. Advocates for this theory will point to the speed and the near symmetrical fall of the structure. The building came down in just under seven seconds.

The collapse of WTC 7 was an event that baffled structural engineers. [54] Building Seven was not struck by an aircraft nor were the fires inside caused or sustained by jet fuel. [55] The common working hypothesis suggests Building 7 collapsed as the result of structural damage from the collapsing Towers in addition to prolonged fires throughout sustained by fuel stores for emergency generators. Further discussion of the intensity and severity of the fires is mentioned below. Engineers refer to this type of destruction as a "progressive collapse."

A kink or crimp near the center of the building is identical in appearance to many that have occurred when implosion professionals have made buildings collapse inwards to minimize damage of the surrounding structures.

* This observation appears to support the demolition idea which suggests that a carefully calculated fall took place. Although the collapse was not as tidy as sometimes thought; the building just to the north of WTC 7 took considerable damage during its collapse. [56]

It is alleged that the Twin Towers fell at close to free-fall speed, which is further alleged to be a characteristic of controlled demolition.[19] For example, Steven E. Jones claims the fall violates conservation of momentum[20]][21]. As evidence of controlled demolition, conspiracy theorists point to the use of words such as "bomb" or "explosion" by witnesses to describe the collapse of the towers.[22] [23] They also allege that no study has been done to ascertain the presence of explosive residues in Ground Zero or the released dust, though many environmental studies have been done on the particulate matter and dust released by the collapse (including by the DELTA group at UC Davis), and none have indicated the presence of explosive residue.[24] [25]. Furthermore, theorists allege that the collapse of WTC 1,2,and 7 are anomalies, since no steel hi-rise building has suffered a total collapse as the result of fire, before or since the 9-11 attack. The WTC towers burned for less than 102 min (WTC 1) and 56 minutes (WTC 2), during which both towers were stable after the impacts. These hi-rise fires are considered the most similar for comparative purposes: [26]

* the Caracas Tower (2004) - burned for more than 17 hours, spread to over 26 floors.
* One Meridian Plaza (1991) - burned for 18 hours, gutted 8 floors of the 38 floor building.
* First Interstate Bank (1988) - burned for 3 1/2 hours, gutted 4 floors of the 64 floor tower.
* 1 New York Plaza (1970) - burned for more than 6 hours.
* The Madrid Windsor Tower (2004) - burned for nearly 24 hours resulting in a partial collapse of the steel sections of the structure, which included concrete members. [27]

They allege that it is particularly relevant to WTC 7, which was not struck by planes and suffered only damage from falling debris from the collapse of WTC 1 and 2.

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