Linked to the group that took 52 americans hostage in iran and held them 444 days. Now, hes seeking a visa to come to the United Nations as irans ambassador. Should the u. S. Let him in . Welcome to the lead. Jake tapper has a little bit of laryngitis. I think he sounds like barry white. His doctor disagrees, so im sitting in. Australia, the base of operations for missing flight 370 which disappeared 27 days ago after taking off from his country with 239 souls on board. The Prime Minister is the one who broke the news to families more than a week ago that investigators now believe that plane went down somewhere in the indian ocean. Malaysian officials, of course, have taken heavy beating, criticism for their handling of this baffling mystery. And more ships are on the way to the search zone as we e speak. Pentagon spokesperson tells cnn the u. S. Has spent nearly 3. 5 million on the search. Thats just for everies in the air. U. S. Hasnt spent a dime yet on undersea operations. Lets bring in our aviation correspondent rene marsh. Why is the search zone being shifted again . Yes, again, and, bill, well tell you last friday up until this tuesday, crews had been scanning one area off the coast of australia, but now they say theyve searched that area, found nothing so, theyre shifting the zone again. As for the criminal investigation and whos responsible, some have been ruled out while others remain under the microscope. 25 days in and Malaysian Police say they remain focused on the pilots and anyone who had contact with flight 370 before takeoff, ranging from those who prepared on board food to one who is packed the cargo. This is a criminal investigation, it is ongoing. We have not concluded the whole thing. Reporter malaysian investigators have been treating the disappearance of flight 370 as criminal since march 16th. Four areas of interest, hijacking, sabotage, and personal or psychological issues. So far, police say all passengers have been cleared in those four categories. As for mechanical failure, its still on the table. Aviation authorities are investigating that. Wednesday families of chinese passengers were briefed privately on the latest. Malaysian officials called it a good meeting. Family members had a different take. I dont think it just give us any useful information because they just sent us to ask questions for we just ask four or five questions and after that they said the Investigation Team is very busy. Reporter meantime, the search zone shifted yet again. Ten planes and nine ships are now zeroing in on an area in the indian ocean slightly eastward of the april 1st zone where they found nothing. Despite the dead ends, theres no talk of quitting. I think if you ask the australian Prime Minister what his longterm intentions would be, hed say well be searching for this aircraft till hell freezes over. Reporter more ships have been dispatched including a british submarine with advance sonar. The australian ship, ocean shield, reaches the zone in another day. On board is a pinger locator, designed to find beacons on the black boxes, which will stop pinging in days. If they havent already. And what about those satellite images . We havent seen any new ones in a while, and it really is unclear why, if you remember, we saw many day after day just last month. It could be officials are tired of being wrong. Those images gave false hopes. Many of those objects turned out to be garbage. But one experts suggests it could be that the best eyes people on ships and in planes are already in the zone so he says only use satellite images when you dont have anything else. Bill . All right. Rene marsh, appreciate your reporting there. Lets bring in our cnn aviation analysts, miles obrien, david soucy. Good to have you both back. Miles, what do you make of this new emphasis on the Malaysian Airline on cockpit security, that month one pilot could ever be alone up there . Is that a law already in the states . It is. Thats standard operating procedure, post 9 11 procedure in the u. S. , the reinforced cockpit door. Anytime the flight crew leaves the cockpit for any reason, another crew member, a cabin person, or another person, a backup pilot, would go on board and be on the flight deck. For security, this is to help see when he comes back to the door to identify the right person a is at the door and open the door for that person. This is surprising to a lot of us who follow aviation that malaysia had not followed that procedure up until now. This tells us theres a lot of focus on a deliberate act. Was there a passenger, another crew member who commandeered and got into the flight deck alone or in fact one of the flying pilots that was there alone and was able to do something the term weve been using a lot is nefarious. So a hightime captain could convince a lowtime junior first officer to get him a cup cfo fee and be alone on that flight deck. Well get into this, the idea that the malaysian authorities have cleared every passenger on that. Let me talk to you about the malaysian Inspector General saying this mystery, quote, would never be solved. At some point you have to wonder is this lost hope, is this real ism . Is he setting expectations . Weve never seen anything like this, so its hard to know where the line is. Right . Remember where thats coming from, from the investigation of the criminal intent. He says it will never be solved, i can understand that from a criminal point of view. Even evidence of the site may not give them any clues as to whether it was criminally invoked or not. So i want to at least in my mind hope that hes not saying well never solve the mystery because i think we will. With the evidence we find when we find it. Theyll keep going until they find something, until hell freezes over. Miles, in terms of the search as we heard there, 3. 5 million bucks on airplane surveillance there. Why not put an Aircraft Carrier out there . Ive been asking this question, bill, since, you know, the beginning and did ask the chief spokesman at the pentagon. He said, well, the George Washington, the Aircraft Carrier in japan 7th fleet which could be there in less than a week if it started steaming with those Nuclear Power plants going, could be on site and eliminates a lot of the issues of range, could put helicopters in close proximity to potential wreckage sites, a lot of eyes on target as it were. He said, well, George Washington has tasks currently and frankly no ones asked to have it. Its sort of up to the malaysians to say, hey, we could use an Aircraft Carrier. Given the conditions now and the conditions in the future, winter coming, why not put more aircraft and ships on target . I suppose its a strategic question as well, but if any country can afford an extra Aircraft Carrier in that area, it would be us. What about this, david, the families of these 18 chinese passengers meeting privately for three hours today with the malaysian government . Were spoiled after, you know, in a dark way when the ntsb has control of investigations like this. At least they give you something every day. Do you get the sense they just dont have anything to share . To me thats management trying to do more personalized communication. Theyve got a lot of fault for texting out the messages th s t had before. They trying to personalize this, manage their losses as far as how theyre telling people that they dont know much. I think thats a critical part of the investigation right now. Its just managing the fact that they dont know. And, miles, if they cant hear a ping and lets just say they cant find any flu shot otm the plane, how long do they keep following that grid across the indian ocean . Until the weather becomes too adverse. Eventually theyll have to quit for the winter, and thats a hard thing to say for the families weve found nothing and now we cant even search because the seas are too high, theres no chance we can even retrieve any wreckage. Hopefully they can keep going for a while. Well have to see how the weather goes. But its such a large area that theyre really going to have to get lucky to find eve an piece of wreckage at this point. Finding a piece of wreckage after all this time then backtracking to where the plane was in the water, thats a whole other matter. Right. And you get the sense, david, the aussies are taking over . Would that be a good thing if they did . More than a sense. Theyve been officially dictated to have everything from everything they find out there, china, whatever ships, boats, whatever airplanes find anything, it has to be centrally located. Thats classic example of how to handle this investigation. It has to be controlled. Everything has to be indexed, everything has to be kept track of in one singular point. They say they had an airtraffic controller to keep track. Youd like to think that means the skies are filled with search planes but only ten at any one time. Yeah. And before we were talking about throw everything weve got at it and that makes sense, but to me it looks like theyre having a hard time managing what they have now if you look at how that search pattern has moved. It doesnt seem to be sense cal to me, but i dont have all the information so im not judging it. Just saying it doesnt look very sensible. David, miles, as always, appreciate your insight. Coming up, it is not an answer, but it is a response. The strict new rules Malaysia Airline pilots will have to follow even though theres still no clue as to what happened in that cockpit. And General Motors ceo hearing on more apologies the day after the company has dragged discovered to have dragged its feet on a potentially deadly problem for ten years. Would this stop you from buying a gm car . At your ford dealer think . They think about tires. And what theyve been through lately. Polar vortexes, road construction, and gaping potholes. So with all that behind you, you might want to make sure youre safe and in control. Ford technicians are ready to find the right tires for your vehicle. Get up to 120 in mailin rebates on four select tires when you use the Ford Service Credit card at the big tire event. See what the ford experts think about your tires. At your ford dealer. 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So call now to get up to 1,700 dollars back or special financing on select lennox home comfort systems. Offer ends june 13th. And download our free lennox mobile app. Lennox. Innovation never felt so good. Hit the beach in florida. And a reunion in seattle. We can afford to take more trips this year. [man] when hotels have unsold rooms, they use hotwire to fill them. [woman] so we got our 4star hotels. For half price. Hotwire hotwire. Com welcome back to the lead. Investigators are removing much of the suspicion about passengers, scrutiny remains intently on the pilots and the crew of flight 370. While theres not a sh lred of e evidence that the captain or copilot had anything to do with that sudden turn from the flight plan, Malaysia Airlines is putting strict new guidelines in place for its cockpits. Pamela brown is, following this for us. We could start with confirmation, what we have been reporting for a lot of days here, that this is criminal. Absolutely. But now malaysian officials are saying this on the record as weve been talk about on the show, bill, saying this is a criminal investigation. Also were learning from sources close to Malaysia Airlines, bill, that the company sent out a memo to its employees basically boosting cockpit security. Heres a couple of notes from that memo. One prohibits any pilot or first officer being left in the cockpit alone, and then also if either need to leave the cockpit a senior cabin steward must take their place until they return. A new Development Today is the fact that investigators say they have cleared all 227 passengers from being responsible for bringing down the plane. So that means that they are basically ruled out that those passengers were involved in a sabotage, hijacking, those other scenarios that weve been discussing, those possible theories. But ive spoken to an investigator here in the u. S. , and he says basically he says how can you be so sure that these passengers didnt play a role in bringing down the plane. Lets take a listen. Youre talking about investigating passengers which resided in 14 different countries, which requires tremendous coordination internationally across Law Enforcement agencies. So that everythings been cleared is an outrageous statement in my mind. It take miss months to do a thorough investigation to look for any potential motive. However, police do say they will continue questioning passengers relatives and anyone else who may have had access to the plane. But again as we heard there from sean henry, who was formerly with the fbi, it seems a little premature to clear all the passengers. You dont have to be a cop to say that doesnt make sense, how could they have gone through that list. Is this the equivalent of fbi in malaysia or local police . What we also need to make clear, were dealing with a language difference here so perhaps something was lost in translation. Thats been something that the experts ive been speaking to have been concerned about from the beginning because during the press conferences you hear certain words, we dont know if cleared means we didnt find anything in their background to mean alarming but to us is that means theyve ruled out these passengers having any development. Perhaps theres a discrepancy with this, but, yeah, its the Malaysia Police saying, look, weve cleared them. Say thats true. Say they managed somehow to knock 227 people off the list. That leaves the crew and the pilots, which theyve had 27 days to look into now. So how do you think that goes . Well, you know, authorities have been focussing a lot on the crew, of course, ever since this investigation really began. Theyve been focusing on the captain and the copilot from that doomed flight. If for no other reason than they were in charge in the cockpit but a senior malaysian Government Official told cnn they found nothing to indicate either of them are responsible for the planes disappearance and at this point theyre not accusing them but theyre also not letting them off the hook along with those other crew members who had access to the cockpit. But they continue to investigate down to every mi nut detail here, bill. Were talking what the crew members ate, if they ate the same meals of course and who even prepared food. Theyre looking at everything. And also interesting to note here, even though theyre saying its a criminal investigation, theyre also saying theyre not ruling out mechanical malfunction as a possible cause. So bottom line, they just dont know why that 777 is missing. Dont know. Dont know anything. The latest on day 27. Yeah. Thanks so much. 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