we understand many of them have gone home. all of them waking up to the grim reality that this recovery process continues and that their loved ones have yet to be identified. christine. erin thank you for that. the ability of the co- pilot andreas lubitz to lock the pilot out of the cockpit is raising concerns of the policies of lufthansa which owns germanwings. our correspondent frederik pleitgen spoke with the lufthansa ceo carsten spohr. he asked about the policy of a pilot being alone in the cockpit. in the united states, for instance if one of the crew members leaves the cockpit, there has to be someone who goes in. a flight attendant or something. why was the co- pilot allowed to be in the cockpit alone? also in the united states to my knowledge, that is true for few airlines. most airlines follow the same procedures at lufthansa. in flight faces low workload a
ultimately, when you look at yemen. it is a proxy war. you have sunni tribes and the iranian backed houthis fighters. with that you are seeing really these two large countries, saudi arabia and iran square off. ian, if there were a ground invasion how effective could a ground invasion actually be in yemen? reporter: i have been to yemen and in the mountains surrounding it. they are perilous. it is similar in part to afghanistan. houthis have been in the area for centuries. they know the terrain very well. it will be difficult for any sort of ground force. when you look at arab armies these are not well trained with
that. however, flight crews are no longer issued that key. initially we had the key, but tsa decided no key. reporter: all right. there is also when you look at the door from the outside, besides that key, there is the fact there is no real way to break in here. there is a key pad. tell me about that. that key pad is obviously a code that as you can see, the flight crews are given the code but it changes periodically. i can t tell you how often and whatnot. you put the code in and you have exactly 30 seconds to enter when that code is entered. if you don t get in within 30 seconds, it locks back out again. reporter: you can t get back in. besides that the pilot on the inside if he wanted to or if she wanted to they can make it so you cannot get in with a code. correct. you saw the deadbolt lock and two buttons to deny access.
gurella tactics. right now, they are hoping these air strikes can be sufficient enough but any land scale operation will incur heavy casualties. that is something different arab capitals have to be ready to explain why forces are there. ian lee in cairo, thank you. turning to iraq a u.s.-led coalition staged 17 targets in tikrit overnight. until now, iranian backed shi ite militias were leading the forces. they are threatening to attack americans. let s bring in jomana karadsheh live from baghdad. complicated, jomana. reporter: it is a very complicated situation,
this door is a slim door. we have the peep hole to see outside. there is more security. i want to take you outside and introduce you to captain ross. if you take a look at the door it is really thick. i can feel it is heavy. what does it take to break down the door? probably more than a grenade. it has been tested with a grenade. reporter: it is really a fortified door. it is a fortress door. reporter: beyond that other ways a pilot can make sure no one can get in here. tell me about the lock. this is a deadbolt as you can see. if that deadbolt is engaged, again, this door is completely locked. reporter: no matter what. no matter what. reporter: how do you get in there? you can t. this of course there is a key back here if you like to show