I don’t think the second bang was an (or more than one) elevator car. I think it was debris falling outside, to the south of the North Tower. Here is why I think so:
Another sound recording of the crash of AA11 was made by the NYC local news crew of Dick Oliver, WNYW, the local subsidiary of Fox News. They were in front of City Hall, preparing to cover the local primary election that was held in the City that day. The camera was running, but placed on the ground, as the plane approached.
[embedded content]Source: https://www.youtube.com/watch?v=0_CrzPvcY3o
Here is the sequence of audible events ... Read even more
