The South tower at 9:59 AM
On September 11, 2001, the two buildings of the World Trade Center were attacked and collapsed. The North Tower (the second tower) collapsed at 10:28 AM EST.
American Airlines Flight 11 crashed into the North Tower (1 WTC), and United Airlines Flight 175 crashed into the South Tower (2 WTC).
American airlines hit south tower at 9:03 am
At 9:03 am, 17 minutes after the first attack, United Airlines Flight 175 Hit The WTC South tower
While there is a wide range of possible explanations for the collapse of the South Tower (2 WTC) before the North (1 WTC), it is believed that the lower impact of the plane on the tower (a full 15 stories under the same point on 1 WTC) and the passing of shrapnel and parts of the plane through three of four floor beams weakened the structure at an accelerated rate and brought 2 WTC down before its counterpart.
The northern WTC tower, then southern WTC tower, then Pentagon and the fourth plane crashed when the patriots inside killed the terrorists but couldn't fly the plane.
The first plane that hit the wtc was at 8:46 eastern time
326.00 us
Yes, the North Tower (also referred to as 1 WTC) was the second of the towers to collapse.
Willis tower's measured width and height is 195 ft.
The south tower collapsed at 9:59.