John Brennan : ` ` System did n't work as it should have '' due to ` ` lapses '' and ` ` human error '' Suspect 's ' demand for airfare ` ` was n't a necessary [ warning ] bell , '' says Brennan . Thomas Kean of the panel says Brennan ` ` wrong when he says this was n't like 9/11 '' . iReport : Tell us about your airport security experiences .
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 '' CNN iReport : Tell us about your airport security experiences .