he has to come back. >> reporter: nic robertson, cnn, kuala lumpur, malaysia. you are in the cnn newsroom. the people searching for malaysia airlines flight 370 have to make a very critical decision very soon. that's when to turn off the ears and start looking with their eyes. i'm talking about the pingers, emergency beacons believed to be at the bottom of the indian ocean. if the batteries are not dead already it will be soon. a high-tech imaging sonar is the next tool to start running when they decide on stop listening for the pings. four day since any sound was heard from the depth of the official in an those search areas. now australia's prime minister told reporters today his confidence still remains high. despite the many challenges tony abbott described the multinational mission as a massive, massive task. month search planes are flying

yet. it is before dawn in that part of the world. crews onboard ships have been working around the clock. slowly and methodically pulling a beacon locator through the water about 1,500 miles off the western coast of australia. we are going to go straight to perth now where cnn's michael holmes is -- it has been four days, tuesday was the last day that any pings were heard. we have heard the australian prime minister express confidence, optimism about the search. the searchers that you meet with there, do they have that same optimism. >> yeah. you know, they do, jim. they know that they are tasked with a very difficult mission. they go out every day and can you imagine going out and just scanning the ocean endlessly from aircraft onboard the various ships as well. it is a thankless task. they are taking it seriously. the ones we have interviewed have all said that they are going to continue with the same enthusiasm for trying to find a resolution to this tragedy that

they have throughout. as you mentioned tony abbott, australian prime minister, he is fairly cautious man normally. for him to say that he still has optimism they will find the black boxes is quite telling. of course, it follows on from retired air chief houston who who is heading up this effort and also said that he was optimistic wreckage would be found. on another note, tony abbott, the prime minister also said to the families of the victims that they would be welcomed to come to australia if they wanted to and would be greeted with open arms. have a listen. >> we would welcome whenever they wish families of the victims to come to australia and they will find themselves in the arms of a welcoming friend. >> and 2 state government here, west australian government, talking to contacts there. they say they are already

drawing up plans for a memorial service if and when records are found and those families do arri arrive. you make a good point there, jim, that -- these pingers, if they are the pingers and everybody thinks they are from the black boxes, they are well past their use-by date, 30 days. they are going to continue from at least -- for at least a few more days so they can triangulate and reduce what's still a very large search area. submersible will go down and try to map the bottom and see what it can find. it is a huge task. it is a very big ocean. and you know, will is always a chance that -- they are not going to actually lay eyes on anything which is a bit depressing for those waiting for some sort of positive outcome. >> no question. that's a big -- next transition from listening to the pings to listen with the sonar at the

bottom of the ocean. thanks for joining us from perth, australia. we have aviation analyst miles o'brien. aviation consultant and pilot tim christensen. aviation analyst, former mtsp inspector. a mold carl. as daylight returns to the search area, this hour, you expressed confidence when we spokerier in the last hour about the pings they heard being a good sign as to coming from these black boxes and leading us closer. would you do anything differently in the search now as it has been going forward? >> not at this point. i think -- the ever going right -- the one thing that's -- i think, very inning is that ocean shields right on top of where the signals were coming frommings so there's some information this has been

previously discussed, is information there that makes you wonder how had got there. really, the old need million the haysta haystack, there it is. the haystack, the whole indian ocean the needle being that one point that -- and they are -- they are doing it correctly. >> i'm going to ask you, miles the haystack has gotten smaller. assuming, as arnold says, they were on top of it or close to on top of it, narrows the search area. how much -- we have been talking about -- i feel like it is another country or state. every week. arizona, you know, new mexico. it is a big chunk of land. estimated how much small wore the search area be based on the data we have. >> it is getting smaller but it is still big. that's the best way to describe it. you know the devices that ping out that sonar moves so slowly that you want to try to hone it down best you can. i think that -- we are going on have to live with the space needle. the pingers have given up their

last ping. >> a sobering thought. i wonder if i can bring you in. you have run investigations of many crashes before. this is a really investigation unlike any other. but people want resolution. the families certainly do. malaysian officials, government officials, airlines and our viewers, let's manage expectations here. even with this data we have now, how long do you think it is before they locate possibly wreckage and begin to understand what brought this flight down? we are talking months, weeks, longer? >> or both. based on past accident investigations, you know, sometimes they are format and sometimes they have good data. really good maps. yet another reason to all study our map, i guess. because in some cases when they go down they are right on top of it. will was one case they got it in two days. another case it wasn't months. of course everybody remembers air france. they had lots of intervening causes. the best anyone can say they are

on top of it, maybe a few days. if not and they have to search up and down the possible paths, 17 miles at this point, that's a long time. they will be looking at weeks to months. >> air prance, the pinger was not working. here you have data. i wonder if could you explain the urgency here. you are a pilot. one of the key driving forces here you need to know what brought that plane down because if it is mechanical you want to correct that so it doesn't happen again. >> over 990 777s flying. i'm sure boeing wants to know. was it a mechanical error on the aircraft that brought had down? was it not? if so, then -- is there an inspection had a needs to be done? as the airplane a is approach 20g years old now, farce the fleet, when the first one was flying until now, and so when

you -- what -- when an airplane is approaching 30 years, the aging of aircraft and wiring and whatnot needs to be inspected. the first aircraft that came to light was was the flight 800. 747. why did that happen was earlier, the airplanes were obsolete before they got to a 30-year life. the two airplanes that flew 30 years, one was a 747. the other one was 727. now 737. 777 will also be in that mode because it is a very successful aircraft. >> that's a point the life of the airplane had a becomes very key. developing problems they weren't aware of before. that's another reason why great urgency to figure out what happened here. thanks for joining us. where is the debris? is it possible the jet is sitting under the water intact? we are going to discuss that

possibility right after this.

welcome back. australia's prime minister is confident searchers are looking in the right area for flight 370's black box. how can there be not a single trace of debris from the plane? finding wreckage of the plane not only depends on where it crashed but also how it hit the water. gary tuchman explains. >> reporter: not a speck of wreck haj has been found from malaysia's flight 37037 raising the question -- is it possible all the wreckage sank. >> the chances of not having debris, very, very remote. >> reporter: the amount of debris on top of the water would vary based on the scenario of how it went down for example, if it went down in a steep dive at high speeds. here's what happened to an alaska airlines jet that plunge flood the pacific off the coast of california in you would. killing everyone aboard.

much of the wreckage sank but not all of that. >> wings were torn off, large parts of the fuselage were torn apart. it was a very large debris field. the debris field was fairly scattered and even weeks later parts and pieces and personal effects were still being combed from the ocean. including by fishermen. >> reporter: what if there was a catastrophe in the last few seconds? an explosion in the air before crashing? that's what happened to twa flight 800 off the coast of long island in 1996. and pan am flight 103 over lockerbie, scotland in 1998. >> in a case of an explosion in the air, debris field is not scattered in terms of feet or hundreds of feet. it is miles. lockerbie, scotland, it was scattered over many, many miles. some pieces found as far away as 10 or so miles at least. in the case of twa 800 the same thing, debris field was very, very wide. >> reporter: there is this

scenario. a hijacking of a ethiopian flight in 1996. the pilots ran out of gas during the hijacking and were forced to make an intention am landing in the indian ocean. even that kind of landing would result in significant debris above the water. >> you hit it hard muff and it destroys the airplane's integrity. you are going to have pieces that are going to be there and open up things like compartments and sections of the airplane that have items that will float. >> reporter: that sentiment is widely agreed upon by experts. here at the accident lab at the university of southern california's aviation safety program, the director says crashes on the water will almost certainly leave floating debris. the question is how far away will it float? the best-case scenario for the malaysia's airline flight. >> sully did an incredible job

of flying. he landed on a river. the river is pretty relaxed by comparison with an ocean where you have swells, 10, welfare, 16 feet. it is pretty difficult to make that kind of landing on water. >> reporter: the search, of course, continues for the wreckage. the landing scenarios just mentioned all part of the investigation. gary tuchman, cnn, los angeles. >> welcome back. i want to bring our panel back. miles here. mary sciavo. miles, i want to bring you in. you talked about the conditions that morning when the plane disappeared. that the ocean was calm and that -- it is conceivable -- again, we are talking about theories here. it is conceivable that the plane might have been able to land. if not fully intact more intact

than some assumed. >> a skilled pilot might have been able to pull that off. i looked at the sea that morning. it was docile day. weather pattern was clear. the winds were light. sea state was pretty manageable. now, it wasn't like glass on the hudson river which sully sullenberger had the good fortune to have. nonetheless, one of the things that pilots train for is this idea of how you would ditch. you either go parallel to the swells or at the very least you go on the back end. you never fly into a swell. was it possible it is a hearty aircraft and -- certainly might have broken up but could have broken up in an isolated place. >> relative to that is it could explain one of the mystery society far which is that you found the pinger but haven't found floating debris. it could explain that. granted it has been 36-some odd days. it could be anywhere at this point. i wonder, again, you know, with the number of investigations you

have run at this point, does that sound like a possibility to you, it would explain why they heard pings but not found any floating wreckage despite flying planes, searching for a number of weeks now? >> sure. that's a possibility. then remember, too, in the sullen burger styles landing on the hudson, there were various boats and other ships in the vicinity. they got lines on that plane in a hurry to keep it from sinking. not only did they make a landing there they had help. if it did make a landing, water landing, it would probably not stay afloat very long. maybe it would break up some and in the sinking process. but it is possible. >> okay. possible. arnold, i wonder if i could bring you in. we are talking about the next stage of this. assuming the batteries died and looking at that sonar equipment. can you describe the challenges that would come with doing a sonar scan of this ocean at this

depth in these conditions? >> the depth is just -- astronomical. an extremely serious problem. the one thing, though, is the -- in the key is trying to make the area as small as possible. i think the australians and the navy have done that fairly well. remember this. i mean, you are talking about 17 miles. maybe the distance between some of the pings that they heard, just to do 100 square miles. that's only 10 by 10 in mileage. could take not only possibly a month or two but well into maybe six months to use sonar and effectively cover the bottom. there is one other thing, though. that is that they will, you know, prioritize some areas within the area so that they will become more effective.

but on air france, they -- did originally look in the wrong area. the calculations were a little wrong. they corrected that. hence, they found it. >> as you look at this each positive development brings a new challenge, doesn't it? assuming you had the pings you have to sort of triangulate the pings. as soon as you find the wregage, which is we are a long way from there, then it is about recovery. getting something off the bottom of the ocean. that in itself is a challenge. >> this is about 2,000 feet deeper than the recovery on the air infrastructure crash. without saying it is submersible, mechanically a particular plate and cut through the aluminum of the aircraft, extract the flight data recorder and the cockpit voice recorder. those are the two key things that they look for. >> that's a great point. it is not necessarily the -- lit not just be sitting there and being plucked. it may be buried under something and you have to cut through --

difficult work to do with that depth as well that's correct. some of the other things, they will do an initial pes -- on the ocean floor. that's where the aircraft is, then -- they will look at the engines and see if there is rotation on the engine. was there power on the engine? you will see that. there will be -- look like a sickle at the end of the large pans and first-stage fans. that will tell you if had you power on the aircraft or if it did truly fly until the fuel starvation. >> which is still an open question. was it under control at that point? did it fly payne stuart style and then disappear. thank you very much. there are breaking developments in ukraine. we will be live in washington right after this break with the latest. ♪ [ banker ] sydney needed some financial guidance so she could take her dream to the next level. so we talked about her options. her valuable assets were staying. and selling her car wouldn't fly.

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we will get right back to continuing coverage of the hunt for flight 370 in a few minutes. we have breaking news to tell you about first. breaking news involves ukraine. rising tensions and more violence today in the eastern part of the country. the police exchanged gunfire with pro-russian activists. 20 men wearing matching military fatigues took control of the city's police headquarters. and just about 70 miles away gunmen stormed two buildings

including one belonging to police. three officers were hurt will. the white house immediately responding to today's developments and we have erin pike here to tell us the latest. real concern had the white house. >> the white house announced just within the last hour that vice president biden will travel to kiev in ukraine to meet with the leaders there as had try to porridge ahead with the new government and with elections that are on may 25. had a was just also hours after had put out a statement from the national security council, the spokesman saying we are very concerned by the concerted campaign we saw under way in ukraine today bicep are a 'tises. apparently it was with russia. steady violence and sabotage. seeking to undermine as the ukrainian states, we call on president putin and his government to cease all efforts to destabilize ukraine and caution against further military intervention and compared to it what they saw in crimea with the

purported -- >> blame on russia now. shuttle diplomacy continues. >> secretary of state john kerry will go to geneva on thursday to meet with russian foreign minister labarov. they are talking about a diplomatic solution. >> kerry talked to him before and no change to russian policy it seems. thanks forgiving us the latest from the white house. chuck hagel says russia's actions in ukraine will have long-term consequences for russia. hagel told me when i spoke to him in beijing earlier this week that sanctions and isolation will seriously hurt russia down the line. >> what's the u.s. going do now as it is clear that strategy so far isn't working? it is not deterring putin. >> the general has to be clear what nato is and is not. ukraine is not a member of nato.

there are 28 members of nato. we each, all 28 members, abide by or are committed to article 5 of the nato treaty. russia is come the each other's rescue and defend each other's sovereignty and integrity of its territory. it is a defensive institution. now, ukraine is outside of that. it is not. we don't have the same obligations. when we have said, all the european union nations have said all of the nato members have said that russia is clearly in violation of the integrity, sovereignty of an independent nation. we will not -- we will not accept that. the invasion in crimea, we have taken action in concert with our european allies or nato allies, economic sanctions. we have taken diplomatic

initiatives that we may take more. we said that. we are looking at all kinds of additional options within nato and european union. >> so far the u.s. and western allies have boosted the number of jet fighters patrolling the region and to spend it all military cooperation with russia. in other news, tuesday marks one we are since the boston marathon bombing. members of a group called one run for boston are making their mark on new york city. the group left stand monica, california, march 16 with members running different legs of the journey across the country. they are raising money for the victims of last year's boston marathon bombing and their continued medical care. on friday the couple -- a couple dozen runners visited the september 11 memorial as well. joined by a few new york fire fighterers running for a comrade killed in new york last month. one run finally comes home to boston tomorrow after more than

3300 miles of running. coming up the next steps in the search for the missing plane. will the search size shrink for its sixth consecutive day. when will investigators send in the underwater drone to join the ping locater? i'll just press this, and you'll save on both. ding! ladies and gentlemen, boys and girls, llllet's get ready to bundlllllle... [ holding final syllable ] oh, yeah, sorry! let's get ready to bundle and save. now, that's progressive. oh, i think i broke my spleen! home insurance provided and serviced by third party insurers.

welcome back. for days we heard words like -- cautious optimism. but today we are hearing, quote, confident those signals in the watt rer most likely from flight 370's black boxes. we are waiting to hear if officials are tightening the search area on australia's west coast. the previous search area, total of 16,000 square miles.

that's barely a fifth the size a week ago and still very large. and listening area, some distance away, is even smaller still. if you think that means searchers are much closer to finding the black boxes the usa navy agrees. the spokesman for the navy's seventh fleet operating the pinger locater telling cnn that he says he agrees with the australian prime minister who seems almost certain that the pings in the water are coming from the flight's black boxes. >> numerous transmissions recorded which gives us the h h hawaii degree of confidence this is the black box from the missing flight. >> it is still a big if the black boxes are ever recovered, it is unclear who would control the delicate information inside. i want to bring in joe johns. he is live in kuala lumpur. the capital of malaysia. as you know and we reported,

malaysia has taken a fair amount of heat for the handling of the investigation. do they have the expertise to handle the data and analyze it if and when the black boxes are recovered? >> it is pretty clear that they do not. they said as much. the thing that's interesting here in this country is, again and again, we have heard people using the word unprecedented. for this country, it is unprecedented while some larger -- the united states, the u.k., australia, have had to deal with air crashes. for malaysia it is an entirely new thing. >> you talk about that team. are they already talking about who they would rely on for expertise? can we expect that a number of done trees' analysts take part as they have to this point determining the flight path of the plane? >> it is anybody's guess. they have not expressed a preference. it is clear that the u.s. and u.k., australia, all have the expertise. this country, malaysia,

certainly has approached all of this in a collaborative way over the last week during the search and likely to continue that. they have also tried to bring in china because they are trying to maintain relation was that country and more than half of the individuals who are on the plane come from china. >> all right. thanks very much. joe johns. talking about the next challenges in the investigation. the malaysian government had other problems as well. for one thing officials keep contradicting themselves. ten days ago malaysia's police inspector said all 227 passengers have been cleared in the investigation. but now they seem to be backtracking. malaysia's transport minister told sky news everyone onboard remains under suspicion. our expert pan sell back with us. i wonder if i could go to you first, mary, on this point. they cleared the crew. they looked closely, including american officials, intelligence officials i talked to, said they

looked very closely to the passenger manifest and flight crew and found nothing. so why say now that everybody onboard is under suspicion? >> because they came under a tremendous amount of criticism for saying that they cleared everybody except the two pilots in a week. i think -- rightly so, persons familiar with investigations said well you can't really do that in a week. you can't do a job to clear everybody except the pilots. if you had the pilots in your sights from the beginning you are committing some of the cardinal errors of investigation which is you can't, you know, decide who your suspect is and make the evidence fit your suspect. that's a good way to get the wrong conclusion. i think they are correcting what had said earlier. and probably trying to save a little face. that's kind of -- goes with the territory of government investigations sometime. >> yes. it is not confined to malaysia in that sense. you are hearing from the australian prime minister now

the word -- confident, p beyond cautious optimism. he is putting a brave face on what investigators learned so far? searchers learned or is there real reason for confidence based on the pings they detected? >> i don't think there is my other plausible explanation what those noises would be. some scientists use these devices, put them on animals and so forth to track them. if a scientist had left a pinger there that was ping that way and hadn't raised their hand by now to say it was his or her project, shame on them. i would -- we are going to assume that is not in the mix here and those are pingers. my concern is the language that the prime minister use, the families hang on every word they say. what if this doesn't pan out? why not let the facts play out and let the families make their

own. >> the idea that the plane dipped down as low as 4,000 feet after it made that turn and was winding its way between malaysia and indonesia. does that make any sense to you? what does that lead you in the direction of believing response to some sort of event in the cockpit or flipt under control? how do you read that? >> the plane leaves altitude, 350, they wanted -- >> 35,000. >> 35,000 feet. you are looking at -- is this a rapid depressurization and want to get it down as possible to 10,000 feet? coming down to land somewhere. it is not clear to me when they were at the lower altitude they seem to have climbed back up. because where this flight terminated was 7 1/2 hours with the fuel they had. duration of flight they had. had they stayed at a lower altitude a long time their fuel consumption would be 20% more. so that flight would only go

about 5 1/2 hours. much shorter than where they are searching now. >> they changed the search area as they have gotten the flight data. it affected the range. arnold, i wonder if i can go to you, being the expert you are, under water searches. i we have talked earlier in the broadcast about the next stage of the investigation in the search where you go from listening to those pingers to looking in effect where the sonar detector. just describe the challenge of that. using this blue fin technology as it is called. >> the blue fin timeless vehicle is approaching max depth where they are looking now. it is a very capable vehicle that can search about the speed of somebody walking. that's a daunl task even in much shallower water. a thousand meters or less. down at that depth, it is even

much more. it is just -- a huge problem. one thing they they want to do, aren't able to really make the area smaller than what he is there is bring in a second vehicle like the 6,000. it is very similar to the 21. down to 6,000 meters. one that was used on the air france. location and recovery. >> as you are speaking we put up a graphic mowing the lawn. miles described it that way. of the scanner how it works. very slow. when you look at something like this, why don't we have a half a dozen of the blue fins? equipment down there right now. to make the process that much quicker. >> can you hear me?

>> was this for me? >> that's for. >> did you yes. the reason that -- the reason we don't have a lot down there right now because it would get in the way of the search for the pingers. when had actually start searching, yes, they can divide the search area up and assign additional robotic vehicles. the blue fin and others, different areas. they have to on a good day they can cover about 40 square miles with the blue fin. if they put more down they can do it faster but can't do them down there with the search for the pingers. that's exclusive because they get in the way. >> i see. in the next step, put more resources down there to shorten up the search line. >> that's right. >> fair enough. pep. it could be the way search crews find those black boxes. next, we will show you exactly how this blue fin 21 side scan

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>> reporter: frustration with the malaysian government started early on. beginning with the flight plan. >> malaysia talked nonsense. lie. had delayed search and rescue for eight days. we want an explanation of this. >> reporter: it was the satellite company, not the malaysian government, which figured out the flight plan and provided vital information to narrow the search area. but despite that information, malaysian authorities kept directing some searches in the complete opposite direction. including the coast of vietnam. >> search and rescue will continue in both corridors. >> reporter: those searches taxed limited resources and the clock was ticking every second on the plane's black boxes. eventually they did abandon the search in the northern corridor and focused solely on the southern indian ocean but valuable time was lost. also in early march u.s.

investigators determined the plane had flown for hours after its last communication. based on satellite data from systems onboard. the malaysian reaction? they denied it. but only days later the malaysian prime minister told reporters that the plane had indeed flown for about seven hours after that last communication. what about the last words from the come pit? >> as far as the pilot communication, according to the record, it was about 1:19. >> 1:19, last mutual fund indication from the cockpit that says "all right, good night. >> they got that wrong, too. admitting later on it was actually "good night malaysian 370. a mistake that, quite frankly, is hard to fathom. since they had the transcript of air traffic control's communication with the cockpit. not only was that incorrect, but

so was their original statement about who said it. >> initial investigation indicated it was the co-pilot who -- spoke the last time. >> now sources tell us it was the captain. more than a month of dubious information and denials and still no airplane. randi kaye, cnn, new york. >> had a was obviously not rosa flores on the blue fin. that was randy kay talking about the malaysian government's missteps in the investigation of flight 370. please stay with us because after this break we will come back live with rosa floores and get a closer look at the scan sonar and the next stage of the hunt for the wreckage of flight 370. we asked people a question, how much money do you think you'll need when you retire? then we gave each person a ribbon

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welcome back. i'm jim chute shuuto in washing. heard a lot about the underwater scanner. what is it exactly? an autonomous underwater vehicle with accurate sonar and a camera for mapping the ocean floor. we get a closer look. >> reporter: four times investigators have heard pings

that are consistent with the signals coming from the missing jet's data recorders. >> i believe we are searching in the right area but we need to visually identify aircraft wreckage. >> reporter: that's where this probe comes in. it was sent to the indian ocean to scour the ocean floor. it's called an auv, autonomous underwater vehicle using side scan sonar, you see it here, to create that picture and equipped with a gps system. you can see it right over here. of course that let's the crew know where this probe is at any point in time. it has been used before to identify and help recover plane wreckage. it would be able to narrow the debris field. for demonstration purposes, it's tethered. that would not be the case, of course, in the indian ocean. once this launches on to the water you're going to see, it kind of floats, it's buoyant. >> our particular auv has about

a 20-hour endurance. to get down to a depth of 4,500 meters it takes about two hours. >> reporter: this is an auv made by bluefin robotics as it searches underwater. it's the same auv that is in the indians ocean ready to dive more than 14,000 feet in search of the missing 777. this animation shows how it moves along the ocean floor. as it were mowing a lawn, creating a map of potential plane debris. the auv is also equipped with a still camera, essential to the search. >> so once we get a debris field, we'll have the auv run a pattern over the debris field with photographs, and that will pretty much identify the airplane for sure. >> are you getting a signal on the auv beacons as well? >> reporter: if they find flight 370, this remotely operated vehicle, an rov, can retroov ie the black boxes from the ocean. >> put two here.

>> it is operate in the deep sea where humans can't and may be the only chance of recovering the flight data recorders and any evidence of what happened to mr-370. >> cnn's rosa flores joins me now. one of the most fascinating and sobering facts we've learned about this is that it moves basically at the pace of a person walking. that's very slow, obviously, in light of the scale we're talking about. how long would it take for this to create a map of the area, of the search area here? >> reporter: you're absolutely right. this is fascinating, because as we talk about these vehicles, they almost seem incredible, because it's fascinating technology, but they do have their limitations, and that is one of them. time. they have a battery pack that lasts about 20 hours. so these missions are about 20 hours long, and then, like jim said, they travel between 2 to 4.5 knots, not very fast.

once they come back, jim, itic tas about six hours to process the data, and then they start getting maps. but when humans start interpreting those maps, looking what's there, on the ocean floor, looking for oddity, anything that looks like airplane wreck amp and then can send the device out there again to get a closer look. like we mentioned, it's also equipped with a still camara. so they can program a specific mission. if they find something, so it can go directly to that location and take a still picture. and, jim, in the case of mh-370, we're hoping and the world is hoping they can find something to have some sort of physical evidence. >> no question. like mowing a lawn, a very big lawn to mow there. thank you very much, rosa flores in new york. how do we know what to believe coming from the malaysian government? that discussion coming up at the

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time jim shuuto in washington. thanks for joining me. see you soon, sir. you're in the "cnn newsroom." i'm am don lemon. day 37 in the hunt for flight 370, despite no trace of the plane now both the u.s. navy and australian prime minister confident they are hearing pings from the plane's black boxes. >> there have been numerous, numerous transmissions recorded, which gives us the high degree of confidence that this is the black box from the missing flight. >> unwavering confidence, despite the fact that the men heading up the search, on the informationav