"According to a top secret Canadian government report, the 9/11 terrorist attacks on New York, had a sequel two months later. On November 13, 2001, American Airlines flight 587 crashed over Queens, New York, shortly after takeoff from JFK killing all 265 people aboard. A captured al-Qaeda operative, Mohammed Mansour Jabarah, told Canadian intelligence investigators that a Montreal man who trained in Afghanistan alongside the 9/11 hijackers was responsible, using a small shoe bomb similar to the one used by convicted shoe bomber Richard Reid for his “suicide mission.” He named Abderraouf Jdey, a Canadian citizen ... "
The Debka article adds that, despite vigorous denials by Washington, this scenario seems plausible, in part because a number of suspected operatives were behaving strangely in the hours before the crash. The article also states that the US received numerous warnings from foreign intelligence agencies before the crash.