John Brennan : `` System did n't work as it should have '' due to `` lapses '' and `` human error '' Suspect 's cash payment for airfare `` was n't a necessary [ warning ] bell , '' says Brennan . In announcing the new security measures Sunday , the TSA stressed in a statement that `` effective aviation security must begin beyond our borders . '' Thomas Kean of 9/11 panel says Brennan `` wrong when he says this was n't like 9/11 attack on US'"
John Brennan : `` System did n't work as it should have '' due to `` lapses '' and `` human error '' Suspect 's cash payment for airfare `` was n't a necessary [ warning ] bell , '' says Brennan . Thomas Kean of 9/11 panel says Brennan `` wrong when he says this was n't like 9/11 attack on US'"