Rose good evening. Scott is off tonight. Im charlie rose. And this is our western edition. And we begin with a mystery what happened to egypt air flight 804 . The air bus a320, en route from paris to cairo, crashed into the Mediterranean Sea some time after 8 00 eastern time last night between the greek isle of crete and the egyptian coast. There were 56 passengers and a crew of ten on board, none of them american. The United States has joined the search for the plane. We have extensive coverage, beginning with Mark Phillips in paris. Reporter this was the second egypt air plane to leave paris in the past day that no one wanted to be on. This flight was taking grieving family members to cairo. Their relatives, who had left on last nights flight, never made it. Egypt air flight 804 had been at its normal cruising altitude in greek air space over the eastern mediterranean, when some time after 2 00 a. M. Local time, something catastrophic happened. Greek radar showed the plane going into a series of violent, irregular maneuvers, first turning abruptly 90 degrees to the left, then swinging through a tight 360degree circle to the right, all while dropping like a rock, one official said, down to 15,000 feet. And then, at 10,000 feet, disappearing off the radar. There had been no distress call from the crew, although the egyptians said an emergency beacon may have been activated. An airandsea search was launched, including this u. S. Orion, sent from sicily. And later in the day, what looked like debris was sighted by the captain of a ship in the area, although greek officials would not confirm this came from the plane. By chance, the aircraft involved in todays crash was seen in brussels last year, but if it was destroyed by a bomb, its not clear where that could have been put on board. In the past day, the plane had flown to eritria, to tunisia, and then to paris. An explosive device on a timer could have been loaded anywhere, says cbs news transportation security analyst and former n. T. S. B. Chairman, mark rosenker. Thats why the investigators are going to be looking at all of the stops that this aircraft made prior to coming to paris. Theyre going to make a very serious examination and series of interviews with anybody who had any type of exposure to this aircraft, whether it was cleaning crew, whether it was catering crew, whether it was the refueling crew, or whether it was the baggage crew. Reporter the search for wreckage, in fact, has become a bit of a mystery of its own. The egyptians said earlier today that greek search crews had, in fact, found debris from the plane, but the greeks later said they had found nothing of the kind. In any event, the mystery of this flight will not be solved unless and until the black boxes, the data recorder and the cockpit voice recorder, are found, and they, charlie, are presumably at the bottom of the Mediterranean Sea. Rose thanks, mark. Egypt air expressed condolences to the families of those on board. Most were from france and egypt. Holly williams is in cairo. Reporter families came to cairos airport today looking for answers, but there werent any. No bodies, no culprit, and so far, no explanation. I want to know where my son is, said this man. Whats the government doing . Mervat mounir told us her husbands niece was one of the flight attendants and had just gotten married. Egypts Civil Aviation minister, sherif fathi, said he didnt know what caused the plane to go down, but had strong suspicions. Terrorism is the most like cause. Its been a disastrous year for egyptian aviation. In october, a russian plane crashed here after taking off from the resort town of sharm elsheikh, killing all 224 people on board. A bomb was the suspected cause, and isis later claimed responsibility. Egyptian Airport Security was tightened after that tragedy, but then in march, a man hijacked an egypt air passenger jet, forcing it to land in cyprus. His suicide belt turned out to be fake, and the hijacker, according to the cypriot authorities, had Mental Health problems. The series of incidents has raised questions about egypts airport and airline safety, but the minister defended his countrys record. Theres no need to improve egyptian Airport Security . In its public statement, egypt air has been emphasizing how experienced the crew members were. According to the airline, charlie, the pilot had more than 6,000 flying hours, including more than 2,000 on the same model of aircraft. Rose thanks, holly. Despite multiple layers of security at airports, terror groups in north africa and the middle east are obsessed with targeting planes. Homeland security correspondent jeff pegues has more on this. Reporter nearly 15 years after 9 11, terrorist organizations remain fixated on attacking the west and its allies by crippling commercial aviation. T e 2010 failed attempt by al qaeda in the Arabian Peninsula to blow up u. S. Bound cargo planes with bombs embedded in printer cartridges foreshadowed what was coming next. Last year, isis claimed this soda canbomb with a detonator and a switch had downed the russian metrojet plane over egypt. In february, the terrorist Group Al Shabaab was suspected of planting a bomb in a laptop, blowing a hole in this jetliner, shortly after it took off from mogadishu, somalia. A month later, another laptop bomb shattered windows when it exploded near a small somali airport. Given terrorist obsession with aviation, u. S. Officials say it is possible an explosion downed egypt air 804. It raises my suspicion level. Reporter that it was, what . That it was something other than a mechanical something reporter a bomb . An explosive, right. Ep reporter john halinski, the former deputy administrator of the t. S. A. , says terrorists have been doing their homework. They understand our tactics. They study the policies and Security Policies of the t. S. A. And other organizations. A device planted on the inside of an aircraft at the right location with a timing device that is conceivable, is not that difficult to do, especially if youre looking at locations that dont have what you would define as the top security in the world. Reporter u. S. Investigators have been scanning social media and other sources looking for claims of responsibility. Charlie, so far, were told there are no signs of boasting. Rose thanks, jeff. Mike morrell is the former Deputy Director of the Central Intelligence agency. He is now a cbs news Senior Security contributor. Mike, everybody wants to know and theyre all being cautious what happened . Reporter so, charlie, im being cautious, too. I have not seen a single piece of data, single piece of evidence that would take us to a conclusion that terrorists brought down this aircraft. Thats certainly possible, but its also possible it was some other factor, like mechanical failure. Well just have to wait and see. Rose but what if it was terrorism . What might it have been . Reporter so, i think there are two possibilities, right . One is a bomb, either placed on the aircraft somewhere in north africa where the plane was earlier in the day, or a bomb placed on the plane in paris. Or, it could have been an individual on the plane, even a pilot or copilot who became radicalized and brought the plane down. I think those are the two terrorist possibilities. Rose if it was a bomb placed on the plane in paris, what does that say about security in paris and concern about the threat of terrorism . Reporter that would be a very significant development. We know that isis has developed a significant, sophisticated Operational Capability in western europe, but this would punctuate that in a way that we have not seen before. Rose and if in fact this is a new tactic, what does that say about terrorism in europe . Reporter it says that they can now bring it to the United States in a very significant way, right, by doing this exact same thing with a flight to the United States. Thats why this is so worrisome. Rose mike morrell, thank you so much. The egypt air crash comes as the t. S. A. Is facing criticism for long lines at airports across the country. Transportation correspondent kris van cleave has more. Reporter growing flyer frustration made for tense moments at chicagos Midway Airport today. Thats right, youre walking to the back of the line where you belong, right reporter but across town at ohare, passenger sarah king felt differently. It can be a bit tedious and bothersome, but i know its for our own safety and protection. Reporter with concerns that the egypt air crash could be an act of terrorism, the Transportation Security Administration is caught between its need to thoroughly screen passengers and baggage, and to get fliers through checkpoints in a timely manner, all while handling a surging number of fliers and a staffing shortage. Its a difficult balance between efficiency and customer service, and security. Reporter t. S. A. Spokesman mark howl says the agency is monitoring the egypt air investigation. Fi theres a reason we do what we do, okay . Why do you have to take your shoes off . Because weve had instances of the shoe bomber, okay. Liquids, the liquid restrictions, is based in real life incidents, so, as things happen in the world and as threats evolve, the organization kind of has to evolve with it. Reporter following the metrojet bombings and the isis attacks in paris and brussels, the t. S. A. Has increased screenings of airport workers, checked luggage cargo in addition to extra scrutiny of passengers and their carryons. In chicago today, f. B. I. Director james comey the lines are an enormous pain, but please know the lines reflect a commitment in this country to make air travel safe. Air travel in the United States, as against a terrorist threat, is far, far safer than it was 15 years ago. Reporter so far, the egypt air crash has not resulted in a visible increase in security at u. S. Airports. Charlie, tomorrow, the t. S. A. Administrator Peter Neffenger will be here in chicago to discuss the agencys efforts to address the marathon lines impacting the area airports here. Rose thanks, kris. Before there was any evidence, both donald trump and Hillary Clinton blamed the crash of egypt air 804 on terrorism. Trump tweeted, looks like yet another terrorist attack. And in a cnn interview, clinton said, it does appear that it was an act of terrorism. Still ahead, a new poll in the president ial race and old accusations about bill clinton. And, morley safer passed away today. Well look back at a reporters bsfe, when the cbs evening news continues. That may put you at five times greater risk of stroke they can pool together in the heart, forming a clot that can break free, and travel upstream to the brain where it can block blood flow and cause a stroke. But if you have afib thats not caused by a heart valve problem, pradaxa can help stop clots from forming. Pradaxa was better than warfarin at reducing the risk of stroke, in a Clinical Trial without the need for regular blood tests. 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Eligible patients could pay as little as zero dollars on copay. Ask your doctor about pradaxa today. If you have allergy congestion muddling through your morning is nothing new. Introducing rhinocort® allergy spray from the makers of zyrtec®. Powerful relief from nasal allergy symptoms, all day and all night. Try new rhinocort® allergy spray. Rose the president ial race is tightening. A cbs News New York times poll shows Hillary Clintons lead over donald trump nationally has fallen from ten points to six, and trumps unfavorable ratings have fallen eight points to 55 . Trump is making good on a vow to make bill clinton an issue in the campaign. Heres nancy cordes. Reporter in an interview on fox, donald trump leveled a harsh accusation about former president bill clintons past. Its about groping and fondling and touching, against a womans will. And rape. Reporter and rape. And big settlements, massive settlements. Reporter 850,000 to paula jones. And lots of other things. Reporter they were referring to a trio of women who say bill clinton made unwanted sexual advances in the 80s and 90s. Mr. Clinton denies it. Two of the cases were plagued by factual discrepancies. Still, the accusations linger, and will be a focus of g. O. P. Ads against Hillary Clinton. She politically attacked Sexual Harassment victims. Reporter in an interview today, clinton would not respond to trumps allegations. You know, if you pick a fight with, you know, a bully, you know, youre going to be pulled down to their level. Hi, guys. Reporter typically, spouses are considered off limits, but mr. Clinton is not a typical spouse. His wife has already outlined a major role for him if she wins. My husband, who im going to put in charge of revitalizing the economy, because, you know, he knows how to do it. Reporter hes also relatively more popular. The new cbs news poll pegs his Favorability Ratings at 45 , compared to her 31 . Plus, the clintons have been pitching themselves as a package deal for decades. Voters often say to me, we got two for the price of one, and they like it. Reporter the topic of rape is murky territory for trump, who was also once accused of rape by his exwife, ivana, a charge she later recanted. And there is no dispute, charlie, that both he and bill clinton had multiple, consensual Extramarital Affairs which made for lurid tabloid fodder for years. Rose thanks. Still ahead, well remember morley safer, who died today, and well have an update on egypt air flight 804. 804. This just got interesting. Why pause to take a pill . Or stop to find a bathroom . Cialis for daily use is approved to treat both erectile dysfunction and the urinary symptoms of bph, like needing to go frequently, day or night. 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She told me that humira helps people like me get uc under control and keep it under control when certain medications havent worked well enough. Humira can lower your ability to fight infections, including tuberculosis. Serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. Before treatment, get tested for tb. Tell your doctor if youve been to areas where certain fungal infections are common, and if youve had tb, hepatitis b, are prone to infections, or have flulike symptoms or sores. Dont start humira if you have an infection. Raise your expectations. Ask your gastroenterologist about humira. With humira, control is possible. Rose this is a sad day for us here at cbs news. Our friend and colleague and good man morley safer died today. He was 84. Morley was one of the premiere journalists of the past half century and a pillar of the leading Television News broadcast of all time, 60 minutes. Steve kroft now, on the life and legacy of morley safer. Here we are, on board the good ship dandahayloo, bound from mali to furudu. Suppose you had a few dollars and you had to get from paris to istanbul. Then, this is how you would go first class on the orient express. Reporter from the dawn of his career to its twilight, morley safer was, above all, a writer, a brilliant writer. He stares down from the y,dium like some Benevolent Bird of prey,