No one knew that WTC7 even EXISTED until 9/11. What, pray tell, would be the point of flying a plane into a building that no one, not even most New Yorkers, would have even been aware of? I mean, at least the Twin Towers had the benefit of being visible for miles, as well as being what most people thought of when you mentioned the World Trade Center. As for the Pentagon; um, yeah, five sided building that is touted as the largest office building in the United States, well known to be the headquarters of the US military... yeah, people are going to know what that building was. Same goes for the Capitol or the White House, both touted as potential targets; every single person in the US, from a two-year-old on up to a 98-year-old, knows what those two buildings are. So why WTC7? If any truther can come up with a plausible explanation for THAT, I'll become a truther on the spot.
Needless to say, I'm not holding my breath.