Okay, let's have a look at how the Secret Service reacted when President Bush was informed by Andrew Card that America was under attack:
The fictional Sherlock Holmes solved the crime in "Silver Blaze" by deducing it was the owner of the house who was the criminal. How did he know? Because the dog did not bark. The only person who could have committed the crime without arousing the dog was someone the dog knew as a friend, the dog's owner.
Now let us turn our Sherlockian logic on 9-11.
Hijacked aircraft were wandering across the eastern half of the country. In theory no-one could have known how many planes had been hijacked. Two planes had crashed into the World Trade Center, Bush was at a publicised photo opportunity at Booker Elementary School, and there is an airport only four miles from this School.