Old News We Have Forgotten
This article is nearly two years old, but it is really on point about the Phoenix Memo and Colleen Rowley's "warning" about Moussaoui.
Rowley doesn't say which of the 19 hijackers might have been apprehended, and for good reason. It appears from public reports that the would-be hijackers had completed their flight training by the time Moussaoui was captured on August 16, 2001. In fact, it appears they had already completed their flight training by the time the Phoenix memorandum was written on July 10, 2001. Moreover, while apparently identifying several suspicious Arab flight-school students, the Phoenix memorandum doesn't name any of the Sept. 11 hijackers.
In addition, Moussaoui's laptop computer, the ostensible subject of Rowley's memorandum, contained information about airliners, crop dusters, and wind currents, but apparently no information about the Sept. 11 hijackers.