I wonder why only the North Tower had two little bridges connecting it to the plaza levels of the U.S. Customs House (6 WTC) and the Vista/Marriott Hotel (3 WTC), while the South Tower didn't have any little bridges connecting it to the plaza levels of the Vista/Marriot Hotel and 4 WTC.
At 3:13 in this YouTube video
https://www.youtube.com/watch?v=IVJDC_jLeFo, you can see one of the bridges.