BLITZER: The 9/11 Commission second-guesses the Pentagon on the timeline of events on that fateful day. What kind of impact might that have? Let's check ... with Jack Cafferty in New York. CAFFERTY: A member of the 9/11 Commission says that the commission didn't trust some of the testimony from Pentagon officials about the timeline of events on that fateful day, September 11. The question we asked is: What does it mean if the 9/11 Commission thought the Pentagon wasn't telling the truth? Marie in Bartlett, Illinois, [writes]: The 9/11 Commission failed. If they mulled criminal charges because they doubted the veracity of testimony from Pentagon personnel, why did they stop at that? And why say so now? If persons are suspected of lying, they must be brought up on charges, and found either guilty or innocent. The commission declared themselves to be judge and jury. And the kangaroo court verdict was not guilty." Paul in Rockville, Maryland [writes]: "The fact that Henry Kissinger and George Mitchell both took the job, and then quit, should have been a tip-off to how big a can of worms they were opening." BLITZER: And, as commercial airliners approached Washington and New York on 9/11, what did the Pentagon know and when?