What about September 10th?

The only thing September 11th changed was the astounding ease with which the Executive Branch could commit crimes against United States citizens.

From Slate:

Today's generation of telecom leaders is similarly involved in the current controversy over spying by the NSA. The New York Times reported in December that since 9/11, leading telecommunications companies "have been storing information on calling patterns and giving it to the federal government to aid in tracking possible terrorists." Citing current and former government and corporate officials, the Times reported that the companies have granted the NSA access to their all-important switches, the hubs through which colossal volumes of voice calls and data transmissions move every second. A former telecom executive told us that efforts to obtain call details go back to early 2001, predating the 9/11 attacks and the president's now celebrated secret executive order. The source, who asked not to be identified so as not to out his former company, reports that the NSA approached U.S. carriers and asked for their cooperation in a "data-mining" operation, which might eventually cull "millions" of individual calls and e-mails.

Thanks to Bernhard at Moon Of Alabama for the tip.