It's well documented that W was WARNED, in a presidential daily brief (pdb) that Al Qaeda was planning to hijack airliners. He may not have known when or where, but he certainly had time to order cockpit door hardening, and increased security.
https://search.yahoo.com/yhs/search?hspart=ddc&hsimp=yhs-linuxmint&type=__alt__ddc_linuxmint_com&p=Bush+pdb+warned+him+Al+Qaeda+was+planning+to+attack

And it was Pearl Harbor vet Mike who first clued me that FDR knew the Japanese were going to attack. 

Those who forget the lessons of history are doomed to repeat them, and boy, did we. W and his neocon buddies pined for "another 9/11" so when they were warned it was coming, they did nothing. Nothing but the facts, ma'am.