Looked through a few documents. Haven't found anything particularly interesting.

The only thing that stood out was an interviewer grilling an employee asking him if Larry Silverstein had hired anyone to look into the possibility of a plane being flown into the towers.

The guy said something like now one was hired for that specific purpose.

Interviewer came back and asked if anyone was hired whose duties would include that.

Response was that an ex FBI agent was hired but he was hired as the head of security for the full building which included any kind of count-terrorism measures.