9/11: Only one of the towers are hit.

Rescue

Fancy ziplines and traverses aren't going to save a lot of people--but even if only one or two are saved, it's a minor victory--and makes heroes of the survivors and those who rescued them.
 
Both towers' lives were measured in minutes after impact. There simply isn't enough time.

Besides, how would they have rigged up this structure to evacuate to the intact one? All the stairs and elevators are destroyed, all but impassable and/or clogged with evacuees.

If the second plane hits on the same angle and stairwell A is open for buisness like OTL there is a chanse.
 
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