thank you so much for joining us. we will see you tomorrow night. thanks for watching. ac 360 continues right now. good evening. john berman in for anderson tonight. the very latest on what brought down egypt flight 804. the search for wreckage, victims, evidence and answers, all under way as we speak. early reports from egyptian authorities that debris had been found did not bear out. however, early suspicions that this was an act of terror and not failure of technology or piloting, those have not gone away. we will talk to our team of professionals and explore all of the possibilities doing everything we cannot to get ahead of the evidence. here's how it all unfolded. >> reporter: 11:09:00 p.m., it departs from charles de gaulle airport, the beginning of a four hour flight to cairo. two hours after takeoff, it

crosses into greek air space. the pilot checks in with air traffic control. 24 minutes later another routine check in south of athens. all is fine. at 2:27 a.m., less than an hour from landing, the plane is cruising above the mediterranean sea at 37,000 feet, about to cross into egyptian air space. time for another check in with air traffic control. but there's no word from the flight. the plane abruptly swerves, then rapidly drops. 2:29, it disappears from radar. they immediately mount search and rescue operation but the plane is nowhere to be found. egyptian authorities say there was no distress call, no distress signal picked up after the plane dropped off from the radar. it is unclear if this is from the plane. this type of rapid plunge is usually caused by a catastrophic event.

was this a deliberate act? the egyptian aviation minister announcing he believes this was likely an act of terror, instead of a technical malfunction. the investigation into the flight shows the plane made stops in eritrea before heading to paris. the plane did undergo a security sweep before heading to cairo and they confirm it passed all maintenance checks before the flight. the weather in the area of flight path was clear and calm. u.s. officials suspect the plane was taken down by a bomb, though they stress this theory is circumstantial. >> we have seen a desire on the part of extremists around the world, including some extremists in the middle east to carry out attacks targeting the aviation system. we obviously are mindful of that and here in the united states,

we experienced the pain of those aviation borne attacks firsthand. >> reporter: so far no claim of responsibility from any terrorist group for the downed plane. anguished family members arrived at the airport in cairo and paris to wait for word on their loved ones. 66 souls were on board, most french and egyptian citizens. among them three children. two were just infants. >> what happened to them is a deep interest beyond the countries directly involved, u.s. military assets are taking part in search efforts. u.s. intelligence and criminal justice part of the mix as well. evan perez joins us with who is doing what and what they hope to learn. u.s. officials, is it still the working theory this was a terrorist attack? >> reporter: that is still the working theory, john. what you're pointing out is how

little hard evidence they have. obviously the wreckage has not been recovered. there's nothing that's been found from data boxes that would give them more of an indication. a couple of things you pointed out are on the minds of officials, and that's the fact that there wasn't a distress call. this is a modern aircraft, apparently well maintained aircraft that has a lot of redundant systems. if there was a problem, the belief is the pilots would have time to radio for help, to say something was wrong, even if something was attempting to do a hijacking, there were three security officials on board the aircraft. and again, the officials believe they would have had time to say something. the fact that there wasn't is one reason why they're beginning with the theory that perhaps this was some kind of terrorist attack and perhaps a bombing. >> i know the u.s. navy is providing aircraft to help with the search for debris. is the u.s. offering intelligence support? >> absolutely. they're looking at every asset they have, including looking at

satellite data, sometimes takes awhile. at this hour, we know officials are combing through every piece of data, including the flight manife manifest. every person on the aircraft is going to be scrutinized, they're going to make sure that they know everything. dossiers will be compiled on every crew member and every member of the flight manifest as well as the people who had access to the aircraft in charles de gaulle airport and elsewhere where it might have landed before the fatal crash. john? >> whole lot of work going on in a whole lot of places, perez, thanks so much. joining us, aviation analyst, david gallon oh that spearheaded flight 477 recovery, richard quest, and philip mud and debra hurtzman, president of national safety council and former chair of the national transportation safety board. you told cnn the operating

theory, initial belief is the plane was taken down as a deliberate act, perhaps bomb. the investigation is just starting. one of the things you always tell us is planes just don't fallout of the sky at 37,000 feet. >> absolutely. in the absence of a strong reason, mechanical followed by pilot error, then you really do always have to default to the question of nefarious activity, some form of bomb, some form of hijacking. i have been doing this for quite some time now. i can tell you when you hear a plane leave the sky at 37,000 feet or end the form of flight, that's where your mind goes first because, john, all the other scenarios are feindishly complicated and extremely

difficult to investigate. airasia is a good example. we thought it was weather, then weather had nothing to do with it, turns out to be circuit breakers hauled by the pilots, and then the plane becomes unflyable. that's why i say and that's why evan is right and the u.s. is right to say that looking at the circumstances in this case at this moment, you do tend towards the security related scenario. >> feindishly complicated, could there have been technical or pilot error in this case? is there a plausible scenario that could have happened? as a pilot, what are those explanations. >> we like to draw parallels to other events. it is very easy for us to do. it is human nature. if you're part of accident investigation you do that, but some of the events that might have occurred, and it may be out

there, take eye pox ee. the captain was said to be cheerful. that's plausible if he was. what if during the period of time with the last communication, they had insidious slow leak of cabin pressure, as it is leaking, you don't know the effect it is having on you. and at some point they're getting giddy, can't perform math problems and can't fly the aircraft appropriately, maybe something distracted them, they disconnect the auto pilot, and this happened. far fetched perhaps, but still possible. we could go into losing control of the aircraft by some other means as richard brought up airasia. >> richard, i think i heard you suggesting you doubt that's a plausible explanation. am i accurate? >> i mean, only in the sense that we don't have any other radar data that would lend support to this.

i take on board fully what les is saying completely, the realms of possibility in this case, and i'm the first person who always says let's not jump to the security solution, let's not say it was a bomb. let's look to everything. take swiss air, airasia, british airways, numerous cases where the final reason is something completely unthinkable at this particular point, which is why we don't speculate. but in this case the level of detail that we are getting and the scenario that's painted means you have to look far more to the security at the moment than to the mechanical. >> debra, i want to bring you in to this conversation. the vice president of egyptair says the material they thought was from the plane is not, in fact, debris from the plane. you've been through a lot of accident investigations. first of all, how does a mistake like that happen and where would you be starting now?

what steps would you be taking now to investigate? >> you know, i think it is not unusual when you look at investigations in the first 24 hours, there are some fibs and starts, it involves complex communication and pressure to get information out. it is disappointing to see that information was put out that they found debris, but not necessarily unexpected when there's some confusion. investigators are really focused now on locating that debris field, identifying where those recorders might be, but in the end of the day we have got to do a better job as an aviation community, making sure we know the exact location of aircraft if they go down, and making sure we have enough information from flight data recorders to put pieces together without having to comb the floor of the sea to find them. >> phil, no claim of responsibility for the attack, if it was an attack.

and if indeed it was such an event, sometimes terrorists, why no claim? >> we should wait a couple days. when you first look at it, you would expect immediate claim. i don't think that's correct. the reason i suggest give it a couple of days, couple reasons. first, isis is not as centralized as al qaeda was in the 9/11 attacks. if this is an isis operation, they may not have known what happened. if it is an independent operator that had access because of clearance to an aircraft, they might not be able to determine within a day or two whether that individual was supportive of isis. second, i think a far less significant reason, if they were indeed responsible, remember the reaction to the paris attacks and how many bombings took place on isis targets in syria. they may be saying when we get out there on the air and claim responsibility, we better have all our guys scattered,

everybody in nato and elsewhere will be bombing lesser targets. i think we ought to give another day or two before we decide no claim is significant. not yet. >> david gallon oh, this this is and attack, one of the things key to determining what happened, flight data recorder and voice data recorder, in addition to finding the debris which still hasn't been done, that's difficult in and of itself, what are difficulties inherent to the mediterranean to get the black box if they get lucky and find debris. >> the debris will be floating at the surface inevitably, then backtrack it. find the center of the haystack to find that needle. the average depth could be two miles in this part of the mediterranean. you have to assemble ships, robots, the organization, it will take awhile to get all of that up and running once the

search area is described. >> and remind us how long do the pings transmit signals? >> i believe on the order of a montd or more. that's very iffy. you have to have conditions just right, water depth and topography to hear things. >> these are things that are happening now as we speak. it is dead of night now in the mediterranean as the search is going on. everyone stand by. there's more to cover, including focus on security at the airport in paris where less than a year ago more than 50 workers were removed from their jobs because of suspected ties to terror. and because this is happening during a political campaign, there is reaction. trump's late reaction to her.

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wells fargo. together we'll go far. the aircraft for flight 804 didn't original ate in paris. it made earlier stops which means they have to focus on airports there as well as cairo and paris.

charles de gaulle has had serious security issues in the last year. atika, this airport is the highest level of security. this is issue during attack on the bat clan months before this happened. >> absolutely. airport authorities have known that charles de gaulle is a prime terror target for some time, and for a number of months they have been very concerned about what's considered back door vulnerabilities, they have access to secure areas, whether or not they can plan something on board a flight. this is why in december authorities here did an extra screening of thousands of personnel, both at charles de gaulle and the other and removed roughly 70 employees from high security areas, took away their badges because of fears they might be linked to radical

islamist groups. they are randomly checking security lockers and the same checks you and i go through getting on a plane, no liquids, laptops being checked, now they go through the checks. even so, they're taking a closer look, scrutinizing who had access to the plane. is there anybody, any weak link in the security chain. >> looking at weak links. any possible areas they're focusing on, atika? >> reporter: what they're doing now, what we have been told is that investigators have been interviewing the ground staff, figuring out who was where at what time, if there was any unusual behavior in the last few days. what the real fear is, that somebody was an accomplice, planting something aboard so another person could somehow perhaps bring some sort of device on board. that's the fear. that's what they're looking at. so far there have not been red

flags. >> atika shubert from paris. thanks so much. back with the panel. richard quest, the fact that the flight was originating from an airport in the european union, traveling from a noneu country, got there from a non-eu country, what's the protocol for the plane? >> the security protocol is basically a screening before every flight and certainly if your plane has gone through tune is and eritrea, you would make sure you do it properly. that screening involves as atika was describing putting seals around laugh toris, gallon east, you can see the sticky tape ripped off, replaced. the danger and problem is familiarity with procedures, breeds complacency carrying them out and you question how well they were actually conduct, how rigorously or efficiently they

were conducted. the pilots are spoken to in europe. they make it quite clear as far as they're concerned not only do they do the walk around the aircraft, the mechanical issues to check the plane in one piece, but that security sweep from eu to non-eu airport is crucial to the airline's standard operating procedure. let's not jump ahead. you have eritrea and tunis, if it proves charles de gaulle is the weak link, we are in to a different scenario, one of the world's top ten airports managed to have such a dramatic security breach. >> phil mud, airports are mini cities with thousands of people working there. it does seem the back door to the airport as opposed to the front door where everyone walks through security, the back door could be a major weak link.

>> you have to think about a couple of things. first thing we think about is are people secured when they get in position at the airport. that's on the front end. they go through an application process. a second piece to think about, somebody is an employee for a year, five years, ten years. if they become sympathetic to the organization, say there's facebook information suggesting that they're following isis, how do you do rescreening to ensure airport employees remain secure. as richard was suggesting, in this situation first thing comes to mind is not isis if this turns out to be a terror attack, conspire to create the plot themselves, it is whether somebody on the inside self volunteered. we have seen it at heathrow airport, plot busted when i was at the cia, people saying i volunteer, i am already in. you don't have to create the plot, i am ready to go. >> what's the level of concern at u.s. airports and what's done here to keep them safe from this type of activity? >> you know, the protocols at

the u.s. airports have been developed over time, they have been perfected, and the intelligence experts have to identify what the threats are and help them address them, those threats, as they develop. it is all part of the protocols that we have to understand. sometimes we don't see the whole story. we don't know what's going on behind the scenes. >> charles de gaulle is still open, the airport is still open now. debra, if this happened at a u.s. airport, what would be going on at that u.s. airport today? >> you know, the lockdown of airports after an investigation begins is really pretty significant. we have had runways closed at san francisco international airport, we had other airports where we had limited operations to support investigations. you know at the large international airports it is difficult to fully shut them

down, so you have to do the best you can to keep operations moving, but in an environment with security concerns, there's different steps that need to be taken. >> les, 777 captain, you see the security checks as they're taking place. richard quest talked about routine can breed complacency. is this something you see? >> absolutely. i get a sheet of paper, domestically or internationally that says the security check has been performed. i know that myself and the co-pilot performed a walk around inspection and looked at every aspect of the airplane, but we don't know what's going in that cargo compartment. we know it is checked luggage, could be some form of cargo, i get a manifest if it is something that is in the form of restricted article, per se, but at the end of the day us as pilots, that's where we see the weak link, not being able to

have control over what gets on the airplane because we know the other folks are doing it, and as far as ourselves, you point out heathrow, they have a very, very extensive crew screening process, to the point that i am physically patted down on some occasions. it is a very random process, but at the end of the day, listen, it is not a perfect system, and the axiom is we have to be right all the time. the individual that decides to put a bomb on the airplane only has to be right once. >> david gallo, dead of night now in the mediterranean, what can be done in terms of the search on the sea surface overnight and what's going to be done when the sun comes up in the morning? >> i'm sure they're looking with some, maybe boats and helicopters using search lights, but i am sure they're using other sensors, infrared, radar in some cases, but pretty much they have to wait until morning

light. i'm hoping they at least drop floats in the water to keep track of currents from this day forward because at some point we have to go backwards to find out where the drift has been coming from. >> lot of different countries involved in the search. it will ramp up more when the sun comes up. guys, thanks so much. stand by. we will continue the security airport situation. next i want to focus on egyptair which has seen a lot of tragedies in recent years. that as 360 continues. face... no one speed... no one way of driving on each and every road. but there is one car that can conquer them all. the mercedes-benz c-class. five driving modes let you customize the steering, shift points, and suspension to fit the mood you're in... and the road you're on. the 2016 c-class. lease the c300 for $359 a month at your local mercedes-benz dealer. when your symptoms start... distracting you? doctors recommend taking

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tonight's breaking news, the search for egyptair flight 804 and answers continues. it is not the first disaster for the airline, they've had two dozen major incidents in four decades. gary tuckman reports. >> reporter: since the 1970s, egyptair, egypt's state run airline had 23 airplane crashes or hijackings, according to the aviation safety network. ten involved fatalities. the deadliest in 1999. egyptair crashes off the coast of nantucket from los angeles to

cairo. all 217 people aboard that boeing 767 died. shocked relatives think about last moments with loved ones, like this man that lost his brother. >> just hugging him, saying good-bye to him, and telling him take care of yourself. >> reporter: the national transportation safety board says deliberate act by the co-pilot caused the crash. on the cockpit voice recorder he is heard saying i rely on god 11 times after the captain went to the lavatory. frantic efforts by the crew to save the plane failed. to this day, the government of egypt refuse to accept findings by the u.s. government that the co-pilot was responsible for killing everyone on the plane. the most recent incident in march. a domestic flight from alexandria, egypt to cairo is hijacked. the hijacker claims he has an explosive belt and the plane is flown to cypress, the hijacker

surrenders hours later, his belt didn't have a detonate or. and this boeing 727 crashed. >> landing gear dysfunction. >> 14 people died. 48 others survived. the deadliest egyptian crash wasn't an egyptair flight, it was metrojet flight 268. rush flight over the sinai peninsula in 2015 on the way to st. petersburg from sharm el sheikh. isis took responsibility for blowing up the airbus 321. all 224 passengers and crew were killed. that metro yet crash happened october 31st, the same date that egypt air flight 990 crashed near nantucket 16 years earlier.

gary tuckman, cnn, atlanta. >> back with richard quest and phil mud and security analyst julia cayenne, and assistant secretary for homeland security. phil, i want to start with you. again, we don't know for sure, not even close at this point, but if someone did take down this plane, if they were able to smuggle an explosive on at charles de gaulle or perhaps before, why target an egyptair flight with just 66 on board from paris to cairo. why not go after an american flight or after a plane with more people on board. >> that makes perfect sense, but you have to be cautious about one thing in these circumstances. we tend to look back, try to impose some perfect logic. if they had access to the aircraft, airfield, why didn't they pick a more prominent target. before we apply some perfect logic on the pass, couple reasons they might have picked an aircraft with fewer people, lower profile airline.

number one, access. say somebody on the inside had access to egyptair and not other aircraft. number two, in post arab spring environment after 2011, there are few governments prominent and aggressive attacking isis. one of those is the egyptian government. they have been loaded for bear and hunting isis in the sinai peninsula. where that russian aircraft went down last year, there's easy rationale for isis to say we're going after them because of what they have done with new military leadership in egypt. >> julia, not only paris and charles de gaulle, not only the airport in cairo, airports in tunisia as well. four different countries now perhaps involved in this investigation. >> it is complicated. the investigation is not just looking at terrorism or deliberate acts. there's three ways the investigation is going. pilot error because that is still possible. something with the plane.

plane disruption. the third is the thing we're talking about most, some sort of purposeful attack, call it terrorism, whatever, we don't know yet. the investigation has to follow all three potential theories because you don't want to go down the wrong path and exclude evidence that may suggest it is one or the other. the reason people like me and phil and others are talking about potential for terrorism, looking at the investigation and crew and airports is because a lot of data is suggesting it is a third thing, there was no sos call, no bad weather, the way the plane swerved at the end, there's a lot of data points suggesting it. i'm not there yet, but you can't deny where the data is starting to sort of weight toward a deliberate attack. >> richard quest, i was struck by a vastly different response from egypt than past incidents that involve that nation.

egyptair, 1999, they still don't say that plane was brought down, even though investigations point to that for decades. now the metrojet crash, took them a long, long time to say what the rest of the world was saying, likely an explosive that brought them down. yesterday today within hours, they say more likely an act of terror than technical glitch. that was striking. can you think of any reason that might be? >> i am not sure there's much difference between the metrojet and this. yes, i know that after metrojet they said a lot of -- they spent a lot of time, aviation authorities, not the government spokesman, but aviation authority saying that. we recognized it could be an explosive, but we can't say that yet. here what he is basically saying, that one bite, one

comment about an hour into the press conference, what he says is yes, i'm looking at the same facts that you are and on those facts it seems far more likely to be terrorism than not. if you go back to metrojet, there wasn't the evidence on the ground until explosives started to be found, a residue started to be found. i am saying in this case, they're stating what is clearly becoming obvious. >> fair enough. thanks so much. just ahead, different responses to today's breaking news from the two people that would be president. we will look at the contrast between candidate approaches next. it's true what they say. technology moves faster than ever. the all-new audi a4, with apple carplay integration.

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one tragedy, two very different responses from frontrunners for president. donald trump tweeted about the crash early this morning before any official said it was likely a terrorist attack, he wrote, quote, looks like yet another terrorist attack. airplane departed from paris. when will we get tough, smart and vigilant. great hate and sickness.

later today, chris cuomo asked hillary clinton her thoughts about whether terrorism rather than technical failure brought down the flight. here is what she said. >> it does appear it was an act of terrorism, exactly how of course the investigation will have to determine. but once again, it shines a bright light on the threats that we face from organized terror groups. isis of course, but then there are other networks of terrorists that have to be hunted down and defeated. and i think it reinforces the need for american leadership for the kind of smart, steady leadership that only america can provide and working with our allies, our partners, our friends in europe, the middle east and elsewhere because we have to have a concerted effort that brings to bear both domestic resources, sharing of intelligence, take a hard look at airport security one more time, whatever needs to be done must be done. >> trump's campaign posted a

press release after that interview. it reads in part, quote, look at the carnage all over the world, the world trade center, san bernardino, paris, the uss coal, brussels and a number of other places. she and our ignorant president won't use the word radical islamic terrorism. ask hillary clinton who blew up the plane last night. another terrible but preventable tragedy. she has bad judgment, is unfit to serve as president at this delicate time. gloria, two contrasts, very different response from two candidates to say the least. >> right. earlier in the day hillary clinton had said to chris cuomo that donald trump was not qualified. then part of the reason he said she was unfit, he was taking a shot back at her, but look, disasters are the prism through

which leaders are tested, and generally speculating without information is a bad practice, particularly if you are president of the united states, or if you are one of two people that might be president of the united states. i think, however, hillary clinton as we see, her experience points her to more of a silent route. so i think in the world at large what trump did is not a good thing, but politically for him, politically it shows that he is strong, that he is anti-terror, that he is willing to tell the truth, and for his supporters it is not going to hurt. >> kayleigh? >> we saw two different responses. for me, donald trump's response indicated strength. in that interviewer with chris cuomo, hillary clinton says donald trump's rhetoric and policies are used as recruitment tools for terrorism, that to me is the most irresponsible thing said today, victim blaming.

let's step back, see what she's saying. she's saying donald trump's policies and words are hateful, spiteful and they offenders terrorists and they shouldn't be spoken because they offend terrorists. when you impart legitimacy to terrorist motives saying they have a right to be offended by his words, that's victim blaming. shaw a show of strength on one hand and impacting legitimacy to motive. >> it is interesting, said almost the same words about donald trump's proposed temporary muslim ban, david petraeus. he said it plays into the hands of al qaeda and isis, not because you're concerned of the feelings of those people, but it leads muslims to be more susceptible to hateful propaganda that claims the united states is hostile to muslims. when he says we are not going to let muslims in, it makes it easy

for them to say america is hostile and at war with muslims. >> hang on. i want to ask something specifically about that. >> today we had a terrible tragedy. she came up and said donald trump talked about radical islamic terrorism, which she doesn't want to use, she used a different term. she doesn't want to use that term. she refuses to use that term. and i am saying it is a terrible thing. he essentially shouldn't be running for office. he doesn't have the right to run for office. i am saying to myself what just happened about 12 hours ago, a plane got blown out of the sky, and if anything, if anybody thinks it wasn't blown out of the sky, you're 100% wrong, folks. >> kayleigh, i want to focus on the last part. he said if anything thinks it wasn't blown out of the sky, you're 100% wrong.

you can say it was likely an act of terror, but we don't know. donald trump running for president says 100%, it was blown out of the sky. is this the type of language, i know his supporters love the fact he uses blunt language, does he have to temper this as he gets closer to the white house. >> i don't think so. you're right, we don't know officially. every sign points that direction. he is pressing on many issues, be it pointing to osama bin laden as being a dangerous person before anyone else did, against the iraq war before hillary clinton was against the iraq war. likely he will be right on this. he is right to say what he said about radical islam. hillary clinton won't use that term. that's what it is. we can put our head in the sand an act like that's not happening around the world, but it is happening. they hate the west, they hate modern muslims, christians, jews. isis, they hate humanity. to act like they don't exist,

radical islamic terrorism, saying those words is important. it is out there, it is killing people. >> you talk about isis, we know what that is. you talk about radical islam, i don't think with all due respect you know what that is. to the saudi government, is it radical islam? the regime is based on sharia, but it is an ill defined term. that's what makes it dangerous. >> the question is about the language. what you said is that signs likely point to terrorism. what would have been so bad about saying that. that all signs.to this. rather than saying a bomb blew up the plane. we don't know. when you're president of the united states or one of the top two, it can be catastrophic if you make that kind of mistake. >> this is an argument or discussion where both sides, clinton and trump supporters like what the candidates did

today. they like where they are on this. >> they do. and listen, hillary clinton was tough on donald trump today in her interview with chris cuomo, calling him offensive, dangerous, loose cannon, and on and on. and donald trump gave it right back to her. this is the race. what we saw today, discussing the airplane crash encapsulates the kind of race we're going to see and the differences between the candidates. >> one day, there are 150 more. thank you so much. hillary clinton had a lot to say about donald trump today, that exclusive interview with chris cuomo. we will bring it to you on this two hour edition of 360. also ahead, a powerful u easy to see he can employees i have they used in the past to bring down planes. could this help solve the mystery of flight 804? i'm there for bessie.

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u.s. officials say the initial theory is a bomb may have brought down egyptair flight 804.

it vanished from radar over the mediterranean, it was bound for cairo from paris with 66 people on board. investigators now face a daunting task of retracing hours leading up to takeoff, also trying to piece together what happened in the plane's final moments in the air. the investigation will no doubt be informed by past attempts to bring down planes. every previous plot, successful or not, contains a trove of information about tactics bad guys used. here is randi kaye. >> reporter: december 22nd, 2001. just three months after the 9/11 attacks. american airlines flight 63, with 197 passengers and crew, suddenly in trouble. passenger richard reed was attempting to detonate a plastic explosive he concealed in his shoes. passengers pounced and the flight headed from paris to miami was safely escorted by fighter jets to boston's logan airport. reed is a british citizen who

converted to islam, he was sentenced to life in prison without parole. >> richard reed is an al qaeda trained extremist, engaged in acts of national and international acts of terrorism, motivated by his hate of the united states. >> reporter: nearly five years later in august, twiks 2016, 24 men were charged with plotting to blow up as many as ten flights over the atlantic simultaneously. their weapon of choice, explosive liquid smuggled aboard in soda bottles. after that, liquids were limited to no more than three ounces. by then, passengers faced tighter security from the 9/11 attacks. shoes had to be removed, box cutters, lighters forbidden. the terrorists were getting more creative. christmas day, 2009. another failed attempt, using the deadly explosive petn.

northwest airlines flight 253 was on the way from amsterdam to detroit when a passenger tried to set off explosives sewn into his underwear. the so-called underwear bomber was sentenced to life in prison. turns out he had been in contact with and march al awlaki, senior al qaeda recruiter later killed in a u.s. drone strike. a year later in 2010 a suspect tries again to use petn as a bomb. on two cargo planes, bound for chicago. the devices disguised as ink cartridges, discovered after a tip. this is a recreation of what could have happened. the prime suspect was a saudi bomb maker. he was believed to be a member of al qaeda in the arabian peninsula. >> there's no doubt about this, this is an ingenious way of doing it. if that had been on the airplane

fuselage, heaven help the airplane. >> reporter: whoever built the bomb likely thought it would pass through an x-ray machine with petn disguised as printer toner powder. randy kay, cnn. >> thanks. we have more next hour. the latest on the mystery of the missing airliner, early stages of the investigation, why u.s. officials suspect a bomb brought the plane down. and hillary clinton in her own words, covering ground in an interview with chris cuomo. new words, new statements on donald trump. donald trump was a big topic there, why she says her rival isn't ready to be commander in chief and words about bernie sanders. the big hilton world sale is on

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