A year before the 9/11 attacks, through data mining a U.S. Army intelligence group had identified two terrorist cells, including Mohammed Atta and three other 9/11 hijackers.  Lieutenant Colonel Anthony Shaffer, a liaison officer of a unit called Able Danger, has spoken on the topic.  By analysis of non-military data, several of the terrorists with direct links to top Al-Qaeda leadership were identified.
Able Danger also used publicly available information from government immigration agencies.
Description on CNN of the technology involved:
On the Sean Hannity Show Wednesday, Shaffer said there were direct links to top Al-Qaeda leaders.  He repeated that on Thursday.

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U.S. Army intelligence had detected 9/11 terrorists year before, says officer