Recovery of human remains, theyre working to figure out what happened to flight 9525. After all, what was reportedly found on that flight cockpit voice recorder, is stunning. Stunning new details this morning in the crash of Germanwings Flight 9525. According to media reports, one of the pilots was locked out of the cockpit. When the plane crashed into the side of this Mountain High in the french alps. All of the 150 people on board, including schoolaged children and two infants, presumed dead. The New York Times cite as senior military official involved in examining audio evidence from the cockpit voice recorder. This official says before the planes rapid descent, one of the pilots left the cockpit and was unable to get back in. The paper quotes this investigator as saying the guy outside is knocking lightly on the door and there is no answer. Then he hits the door stronger no answer. There is never an answer. He says you can hear he is trying to smash the door down. The chilling report deepening the mystery of why this plane crashed. It means either medical emergency, which meant they couldnt get back in again, or secondly nefarious. The lock on the cockpit door is controlled by a lever on the pilots dashboard. In order to lock the door someone would have to intentionally move the lever from the normal position to the locked position. The question is who. The settle should have been two people in the cockpit here. Whatever was happening with locked doors or not locked doors, why wasnt there two people in the cockpit. The Parent Company of germanwings said they did not have any information about the times report but are looking into it. Theyre still searching for a critical piece of this puzzle the flight data recorder. And that would be able to tell them how the plane was flying what sort of commands the plane was receiving prior to the crash. Now theyve managed to find the case but the recorder itself is missing. The ceo of lufthansa says he believes its highly probable theyll eventually find it. But the question obviously becomes what sort of condition will the recorder be in when and if they do. Chris . Now of course the idea of what the plane was doing is secondary to what the people who were suppose to be flying the plane were doing. The germanwings ceo will speak at 9 30 eastern time presumably about this new development. In an odd twist, lufthansa, the Parent Company of germanwings claims it knows nothing about a pilot being locked out of a cockpit on flight 9525. But investigators seem locked on to this. So the focus is now on the people who were supposed to be flying on the plane. Cnn correspondent diana magnay is live in halter germany with that part of the story. Well lufthansa said they dont want to participate in speculation. To a certain extent you can understand why both germanwings and lufthansa are keen not to add to any of the speculation or fuel anything before they have the verified facts in front them they can present to the grieving families of so many victims from 18 countries across the world. I want to move out of the way and show you just about ten minutes ago, there was a moment of silence held here in front of the Joseph KoenigGymnasium School where 16 Exchange Students and two teachers were lost. The children filed out of the school before 10 53, the moment when the plane lost contact with the radar and came down. Theyve been standing here very very solemn moment for quite a long time now, much longer in fact than one minute. The headmaster spoke to them about their grief. They have of course been counseled by psychologists, trauma counselors but weve witnessed a painful moment here as the students come to terms with their loss and as so many around the world come to terms with their loss. Chris . Thank you very much. The dignity of the dead obviously of the upmost importance. That also involves knowing what happened on that plane. Lets try to figure out where we are in this investigation. We have our best here mary sciavo cnn aviation analyst and former inspectorgeneral with the department of transportation and david soucie cnn safety analyst, was an faa safety inspector and tom fuentes, cnn Law Enforcement analyst, former fbi assistant director. We have the right team here. Lets take a look at what were doing here. Were trying to figure out what was the plane doing, david . What was going on with it mechanically. Not now, now, its about understanding what was heard on the voice recorder. How do you break down the questions raised . The questions raised right now is that if the pilot, if New York Times report is true we have to qualify that but that the pilot had left the cockpit, the other pilot tried to evidently tried to lock him back out of the cockpit that has to be manually done. Can that be done . And how . It can be done. Theres a switch that you have thats controls that door. So it can be done by simply putting it in the locked position and not allowing the person to come in. Theres some procedures that well go through as we go forward here. But nonetheless, it was an intentful move to lock that door. To make this clear to the team here you guys know this already. But for the rest of us heres how the Airbus Company explains how this door mechanism is supposed to work. Listen to them in their own words. The captain moves the toggle switch to the lock position. The open light remains extinguished. Now if we look at the code pad, the red l. E. D. Is lit, confirming the door is locked. Be careful, Automatic Door opening, the code pad and the buzzer are inhibited for five minutes. What he seems to be explaining lets put it over to you, mary is the person who remains in the cockpit can defeat the ability of someone outside the cockpit to get back in even if they know the code on the keypad by flicking a switch and then that would buy that person in the cockpit an additional five minutes before someone can attempt to reenter. What does that mean to you . Well that means, and that is something for which Airlines Need to have policies and procedures in place. That is why if for u. S. Carriers and various other carriers around the world, if one of the pilots leaves the cockpit during the flight a Flight Attendant must enter the cockpit and be there as well. We dont require three pilots or four pilots on flights, but we do require someone else in the cockpit in the event that the pilot remaining in the cockpit, who hasnt left for the bathroom break or whatever somehow becomes incapacitated, there is a second person there. And those situations have happened. But mary is that the same rule in the u. S. And in europe. No. No. No. If thats not the same rule. Then we dont know if anyone else was in the cockpit except the one flying the plane, that is right . Thats right. We dont know that for sure but on the other hand, even if a member of the crew went into the cockpit, if the other pilot is going to kill 150 people including himself, then he could kill that person right away. And defeat that issue of having the second person able to let the other pilot back in. But do we hear anything we dont hear anything reported. We have a completely partial leak here. We dont know if that was the extent of the voice conversations. We dont know if there was more to that. You know, theres much that we dont know. The other fear i have is if the french plug this leak and this person can give no more information, it could be months before we hear another thing about this. Because if they have the press Conference Today and say you know were not talking about it or no comment, thats going to be it. Special entry theyre going to wait until they get the flight data recorder. Im okay as long as they know what theyre talking about. If somebody comes out and says hey, this isnt true then the New York Times has made a huge error, i would be very slow to accuse the times of that given the level of reporting there generally. David, if this does hold and Something Like this did happen one of the scenarios thats being offered up by experts in the community is well maybe it was you know a Catastrophic Health thing and there was nobody else in the cockpit because germanwings doesnt follow the protocols we do in the u. S. As mary was just explaining. In this airbus the simple scenario of someone slumping forward, the stick as ive been told by my producer john griffin, is that the wheel is not there, the stick is not right in front. How does it work. Its right here where the control is if you slump forward it would have to be this. But if that happened if it was pushed forward, what happens on the airbus su make a controlled input. Then you let go of it. It would take that controlled input, knowing you intended to start your descent, so it will start the descent, wherever you let go of it. It will maintain that exact flight path. If you let go of it. Its not going to many could up like this. Its going to continue in whatever you did. This would have had to be a bump and it would have had to be directly forward. Because remember there was a bigno change in the flight path. Its hard for me to believe that a bump in the cockpit would have caused it to descend. The auto pilot would take over at that point. Maintain the heading as well. Thats a possibility it would get bumped forward, but the auto pilot maintained that direction. Another big question mary even if everything reported is true is there no other way for the crew to communicate with the tower or anybody else about whats going on in the plane if theyre not in the cockpit . Well actually yes and no remember back to september 11th 2001. The way that the Flight Attendants and others in the back of the planes had to communicate, they got on some got on their cell phones and some tried the air phones which no longer exist. So there wasnt any way for them to do that. Now depends on the airline itself if they have put in Additional Communications capacities. But it doesnt seem that way. Because if someone was trying to get back into the cockpit, they would have used it. And then of course theres another thing looking back in prior crashes, not this one. But in one where the pilots were alleged to have been intent on committing suicide, one of the pilots, they turned off the cockpit voice recorder they pulled the breakers on it. That is another mystery, if that was the case why did he leave it on . As people in the media of going down the road of if this is an intentional act. What do we know about the pilots the names involved any affiliations. This would be late already for a group to claim credit for Something Like this wouldnt it be tom . I think in most cases you would have expected credit but maybe not. Its not always immediate when a Group Claims Credit for this. But you know theres still much to be done and learned about the pilots the crew the passengers. Everybody about that. You know i think originally most people ruled out that it was an explosion or a bomb on board. Because the appearances of the pieces of debris being so small, that right away, they thought that plane hit full speed into that mountain and disintegrated. It doesnt rule out bad behavior on the part of somebody whether its Mental Illness or whether its a terrorist act or a suicide or any number of things that way. Bau deliberate act nonetheless by somebody on that plane. You guys taught us that to the uninitiated when you hear about an explosion, you think oh it will make small pieces you guys taught us as experts that actually no theyll wind up being bigger pieces because the energy goes out, high speed, you wind up getting disintegration like were seeing now. Another question that it raises if what theyre hearing on this recording is accurate who else was hearing on that plane, who else was suffering for the last long minutes while the plane is descending. Still leaving so many more questions unanswered. Well get back to that. Were also following breaking news out of yemen this morning, saudi arabia launching air strikes against Houthi Rebels with help from gulf arab allies egypt and jordan. The u. S. Providing some support, but not with military action. Now iran who has backed the Houthi Rebels is infuriated and calling for a stop to the saudi intervention Cnn Senior International correspondent Nick Paton Walsh joins with us more. The conflict thats been dragging yemen into a spiral now which makes it even easier for al qaeda in the arabian pennsylvaniainsula who want to attack the u. S. To take base there. Weve seen the Houthi Rebels sweep across the country and kick out of the capital, the president , whose whereabouts isnt known. Reports he might be heading to saudi arabia. Its unclear right now. The decision by saudi arabia to intervene like this with 100 war planes they say with dozens from other gulf nations backing them up they say, and also egypt making it clear theyre militarily involved as well. This plunges potentially yemens internal conflict into a big wider regional problem. The u. S. Is in the game theyre clearly providing logistical intelligence support to the saudiled coalition. Theyre fighting the houthis, the houthis are backed by saudi arabias key enemy in the region iran. This has the potential to spiral regionally out of control and we have the u. S. Very keen on a political deal with iran. The seismic changes happening across the region could impact that too. Thanks for that report. We want to go to iraq now, the u. S. Fighting to take back the iraqi city of tikrit from isis. President obama making the decision to launch air strikes, responding to a desperate call from iraqi forces on the ground. Cnns Senior International correspondent, arwa damon is live with the latest. Overnight the u. S. Launching a dozen or so strikes in and around tikrit. This coming at the request, the specific request of the Iraqi Government. And this is a portion of the battlefield that the u. S. Had largely been uninvolved in up until now. The fighting force on the ground mostly made up of shia militias volunteers most of them shia as well. The Iraqi Security forces present, too, yes alongside some sunni fighters but definitely this battle being led by the Iranianbacked Shia forces. Iran very overt in its presence in the fight for tikrit as well. Top commanders on the ground advising the iraqi troops all different factions of them as they are attempting to move forward. Why these strikes at this critical junction . Well there had been something of a pause in the battle as isis it seems regrouping itself in tikrit. Digging into a point where at this junction the Iraqi Government felt it was critical to skt United States for those airstrikes. But the potential to cause tension as well. Because the majority of the shias, the volunteer militias fighting on the ground very adamant they do not need americas involvement. Arwa thank you so much for that well be talking to our experts about all of this coming up. A big newsday here. We have all the new developments overnight in the crash of Germanwings Flight 9525 our top aviation experts examine how a pilot could get locked out of the cockpit mid flight. Another big story this morning, bo bergdahl facing charges, desertion and other charges, giving his first explanation of what happened. Were the five taliban prisoners we swapped worth it for a deserter. Sir, were going to need you on the runway later. Dont let a severe cold hold you back. Get theraflu. With the power of three medicines to take on your worst pain and fever, cough and nasal congestion. It breaks you free from your toughest cold and flu symptoms. Theraflu. Serious power. When account lead craig wilson books at iaquinta. Com. He gets a ready for you alert the second his room is ready. So he knows exactly when he can settle in and practice his big pitch. And when craig gets his pitch down pat, do you know what he becomes . Great proposal lets talk more over golf great. 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The cloud allows us to scale up so we can handle that volume. We can help keep people safe and to us that feels really good. More on the mysterious development overnight in the germanwings wings. The New York Times reporting that one pilot became locked out of the cockpit. Why couldnt he get back in . And what are the protocols for locking someone out of the cockpit. Lets bring back in david soucie our cnn aviation analyst. It gets stranger and stranger. A half an hour into the flight one of the pilots left the cockpit. Is that unusual . Its not unusual, its something in a can happen. Its part of a protocol in the United States. We have a different protocol than they do at lufthansa. We have the protocol of making sure that theres no one alo