why would he even know anything about it?

Well...because he represents the state of Massachusetts and Logan airport was involved in the "attacks."

And if this was the "event that changed America," he should know ALL about it. The true set-up came with the question before, when the woman talked about Dr. Steven Jones' evidence of thermate bombs at the WTC complex and asked if Kerry would be open to investigating that, and he said he would. So yeah, he was shrugging it all off, but he's on film saying WTC 7 was brought down the DAY OF THE ATTACKS through demolition procedures, and he's agreed to look at Jones' conclusive evidence. Now his feet will be held to the fire. He'll never be elected again after this. He might be an appointed reichmarshall or something, but the 9/11 Truth movement is going to break over America this summer when Loose Change hits the theaters, then all this footage will be resurrected, and Kerry's a goner. A great day for America.

I mean, the owner of the building said it was demolished, there was no time to plant the charges, then the government covered it up. Short of Mohamed Atta screaming in your good ear that he didn't do it, you can't get much more conclusive. This was set up ahead of time.