US aviation received 52 al-Qaeda warnings before 9/11

America's aviation authority received numerous warnings about al-Qaeda attacks in the six months before 9/11, including five that mentioned hijackings and two that mentioned suicide operations, it has emerged.
A previously published report by the commission set up to investigate the September 11 attacks on the United States reveals that the US Federal Aviation Authority received 52 intelligence reports on al-Qaeda between April and September 2001.
The 911 Commission report criticises the FAA for failing to strengthen security measures in light of the reports, and accuses it of allowing a false sense of security to prevail.
The aviation industry was more concerned with hijacking threats overseas and did not appear to give serious credit to the idea of hijackings at home, the report added.