From the website:
Home page: http://www.nist.gov/el/disasterstudies/ ... ome.cfmWTC page: http://wtcdata.nist.gov/index2.htm
Both fire cases show the columns reaching 400°C or higher, in other words column 908 and many others had likely reached DCR of 1 by the time of the collapse.
Only a little more severe aircraft damage (as we know NIST didn't get the entry angle right) would place the entire group of core columns in northeast in danger of collapse if heated at or above 400°C.
The temperatures for WTC1 look only worse.
