Although it would like to do so, Al Qaeda does not have the capability of launching an attack on the scale of 9/11, when hijacked airliners flown by suicidal Islamist terrorists slammed into the twin towers of the World Trade Center and the Pentagon, killing thousands.But Al Qaeda still could carry out attacks against symbolic American targets such as the New York subway system or a passenger jet – two plots that were thwarted last year and could have killed hundreds of people. And, according to the report, “This level of threat is likely to persist for years to come.”Al Qaeda and its allies also have established the beginnings of a terrorist recruitment, radicalization, and operational infrastructure in the US, according to “Assessing the Terrorist Threat” by the Bipartisan Policy Center. (The center is a nonprofit organization established in 2007 by former Senate Majority Leaders Howard Baker, Tom Daschle, Bob Dole and George Mitchell – two Republicans and two Democrats.)