They died at their posts in the Pentagon.
A few of my former coworkers died in the initial hit. After I left my job at Marsh & McLennan in midtown, part of my group was moved down to the WTC.
Oddly, if I was still working there, that move would have probably prompted me to stay with the company. I thought those buildings were gorgeous, and would have been absolutely thrilled to work there.
the infowarrior