amsterdam to the u.s. with a bomb hidden in his underwear. there were no air marshals on board. after this attack was foiled by passengers the president called for -- >> more air marshals on flights. >> reporter: homeland security janet napolitano testified before congress. >> we will strengthen the capacity of aviation law enforcement, including the federal air marshal service. >> reporter: has it happened? not according to the federal air marshals or f.a.m.s as they call themselveses who are supposed to be making those flights. they spoke to cnn on the condition we protect their identities. >> since christmas day attempt, we -- >> reporter: but there is a reason for it, these air