Something else. Many now asking tonight, what are those marks . The science revealed. Good evening. And its great to have you with us here on a monday night. And we begin with the travel nightmare, still playing out at this hour. Thousandsle of passengers stranded after a computer outage at delta airlines. The scene in boston. Passengers who should have been in the air waiting in long lines there. Many still hoping to get on tonight. The Ripple Effect felt across this country. And just take a look at the radar from last monday morning at 7 00 a. M. You can see the number of delta flights in the air. The same time today, just a few getting off the ground. Abcs david kerley, leading us off. Reporter delta airlines, the countrys second largest airline, and its passengers grounded. Everything is down right now. Everything is down . Yeah. Reporter a computer meltdown that has already delayed a third for a short time this morning, there was not one delta flight in the air over the u. S. And not just here. Lines forming as deltas entire computer system, world the wide, went down. Leaving jets from newark to london stuck at the gate. I was like, oh, no, you know, were headed out, and we might no have anywhere to go. Reporter for some passengers, a night sleeping on the floor. Frustrating delays. I tried to call delta and they told me id have a threehour hold. Reporter an electrical componnent failed at deltas atlanta center, a power outage that shut down computer pilots couldnt get data. Passenger kiosks stopped working. The ceo took to twitter. I apologize for the challenges this has created for you. Reporter computers. We rely on them for everything, dont we . It is a good thing until the Technology Goes bad. Reporter southwest suffered a computer glitch, leading to the cancellation of 2,300 flights. Delta is still struggling to get back on schedule. Tonight, delays range from one to three hours for flights. We are learning more this evening about the 10yearold boy who died while on a water slide at a water park here in the u. S. , in kansas city, kansas. The slide is the tallest in the world, taller than the empire state building. Going down the slide, you can reach speeds of nearly 70 miles an hour. 10yearold caleb schwab was there with his parents and three brothers. His father is a state representative. And tonight, what one witness, a nurse who was right there, now says he witnessed. Abcs alex perez is in kansas city reporter tonight, an eyewitness giving the first accounts of the horrific accident that killed 10yearold caleb schwab. Basically, i heard a couple loud booms, just sounded like something hit the slide like, boom, boom, and looked at my cousin standing next to me, i said, i think thats a body. Outside of the raft. Reporter steve was in the water park in kansas city sunday afternoon, he says schwab was riding in the front of the raft with two women in the seats out. He raced over to help. As i get closer and i put my hand on the slide, the lifeguard said, theres nothing you can do. Reporter earlier in the day, he rode that waterslide with his cousin. She told him the velcro on one of the two seat belts came loose. Her belt has come undone. Reporter schwab was a freckledfaced baseball fanatic and son of scott schwab. In a statement, the family sayinging, since the day caleb was born, h joy to family. The ride standing at 168 feet high, taller than the statue of liberty. And, plummets 17 stories in just seconds. Riders reaching speeds of nearly 70 miles per hour. Abc news was there when the ride opened two years ago. The slide requires a minimum height of 54 inches and two to three riders must be in a raft. Combined weight of the riders must be 400 and 550 pounds. Reporter but before its big safety. Early testing shows sandbag dummies flying off the slide. It was reworked and seat belts and safety nets were added. And in a statement tonight, park officials would only say the investigation is ongoing. The slide will remain closed indefinitely, but the rest of the water park is set to reopen on wednesday. David . Alex perez in kansas. Alex, thanks. Now, to major developments in the race for the white house tonight. A group of 50 republicans signing a letter this evening saying donald trump, in their words, w reckless president in american history. It comes just as trump tries to turn the page, and a new poll out tonight. Showing Hillary Clinton at 46 , trump at 34. She has a 12point lead. Tonight, trumps new tax plan, and how he handles protesters in the crowd. Is it a new sign of discipline . And tonight, an apparent break within the bush family. Who is now signaling support for trump . Abcs tom llamas, on the campaign trail. Reporter in a rare moment protesters interrupt him at least a dozen times in detroit. Never losing his cool. I will say, the Bernie Sanders people had far more energy and spirit. I will say that. Reporter trump once enocouraged his supporters to take on people disrupting his rallies. Knock the crap out them. All right, can you get them out. Id like to punch them in the face, ill tell you. Reporter but today in detroit, trump shed that brawler i want to jumpstart america, and it can be done, and it wont even be that hard. Reporter trump revealing that under his plan childcare expenses wont be taxed. And hell simplify the tax code by having just three brackets. 12 , 25 and 33 . For Many American workers, their tax rate will be zero. Reporter Hillary Clinton, today saying shell be a Small Business president. They tried to make his old tired ideas sound new. Reporter for her part, clinton Still Standing by this promise she told david. You said, its your goal not to raise taxes on families making under 250,000 a year, a goal, but can you say thats a promise, as you stand here tonight . That is a pledge that im making. I made it a promise . When i ran in 2008. Yes. And it was the same one that president obama made. Reporter and now, trump may have more than clinton to worry about. I do hes a conman. Reporter former cia operative Evan Mcmullin launching an independent bid for the white house. Mcmullin, who recently worked on policy in the house of representatives, is being helped by republicans unhappy with trump. Well, what do you say to republicans who support trump who say a vote for you is going to be a vote for Hillary Clinton . He was already losing badly. Hes alienated broad swaths of our population. Donald trump cannot win. Reporter and tonight, in what appears to be a break with the rest of the bush family, who have all signaled their concerns with trump, one of jeb bushs sons, telling republicans they have to back trump. And you know, for team bush, its a bitter pill to swallow. And tom llamas with us live here in new york tonight. Tom, back to that list of 50 National Security advisers, all of them republicans, i mentioned a moment ago, thats a rare reporter david, donald trump just responded, calling the people on that list, part of the failed washington elite that have made the world a more dangerous place. David . Tom llamas with us live again tonight. Tom, thanks, as always. Overseas tonts, the hunt is on for an american professor who has been abducted in afghanistan. Officials say he and another professor who teach at the American University were driving near the school in kabul when several men in military uniforms them. Kidnappings and other crimes have reportedly surged since western troops started to withdraw. And from pakistan tonight, a devastating toll from a suicide bombing there. At least 70 people were killed. Most of them lawyers who had gathered after the head of their local Bar Association has been targeted and killed. A breakaway Taliban Group and isis both claiming responsibility. Back here at home tonight, and to severe floods were watching at this hour. Parts of floridas gulf coast, already under water. The roads and businesses in st. Pete beach already swamped. A number of accidents have been cleared along state highway 399 today. Also, a Tropical Storm were watching. So, lets get right to rob here tonight. Reporter david, a lot of deep tropical moisture over the southeast. You see it rotating around this low. We have flooding from raleigh to asheville. But the big target is florida, the panhandle there. Flood watches that have expanded west. Flood warnings between perry and cross city. Over 20 in some of the areas just offshore. Another five over the next 48 hours and the rain, i think, is going to persist right through the end of the week. Here is javier. Probably seal this moisture get into the Desert Southwest later on. Right now, it is hitting cabo san lucas. Max winds, 65 miles an hour. It will ride up the baja. Very active Hurricane Season in the pacific, david, this year. Rob, great to have you. Another weather headline this evening, a small wildfire east of los angeles, exploding in just hours. Triple in size, in fact. Called, is burning in the San BernardinoNational Forest tonight. Several dozen homes have been evacuated and parts of two state highways are now closed. Now, to the american athletes in rio making us proud and taking the lead. Michael phelps learning his 19th goal in the freestyle relay. Ryan held, his tears coming as the National Anthem was played. American swimmer lily king with a number one signal when she won. Signaling Something Else to the russians. Themselves, hoping for some extra support in their competition today. Team usa, ahead in the medal count. As i mentioned a moment ago. Matt gutman, part of our team from rio tonight. Reporter tonight, some bling added to Michael Phelps treasure chest. Hi his 19th gold. A domination in the pool in the 4 x 100 meter freestyle. Phelps with that celebratory flex of his 64 frame. As the an hem played, the vet grinning, but rookie rya the emotion becomes contagious, caleb dressle cries, and finally, the most decorated olympian in history is overcome, too. Also winning in the pool, phenom katie will deck caledecky. So far ahead, she lwas already celebrating before the other competitors touched the wall. Some scowls in the pool, too, previously suspended for doping came in first in her heat, holding up number one. Lily king responding with a finger wag of her own while watching the event in the ready room before beating her time herself. Shaking your finger number one and youve been caught for drug cheating, im just not a fan, so you know, going to go swim my heart out for usa and hopefully that turns out the best. Reporter these fellow superstars sharing a picture. Phelps and the known as simone biles. Biles leading team usa in a sweep of the Gymnastics Team competition qualifier. The crowd roaring as biles nails her signature move named after her, of course. The women finishing one, two and three. The mens Gymnastics Team currently out of medal cop teng contention, but it is led by sam mikulak. Who we met at team usas he even took some time out to teach me the basics of the pommel horse. He suggested today that the mens team, who always seem to get less attention than the womens team, might better market their sport if they competed shirtless. They certainly made a statement with this instagram picture they posted in copacabana beach earlier this year. Also disappointing, surprisingly, the williams sisters, out in the first round of their olympics doubles tournament. This is their first loss in olympic dou but with katie ledecky, Michael Phelps and the womens Gymnastics Team vying for gold behind me tomorrow, theres plenty of opportunity for redemption. David . Matt gutman, thank you. And well hear from amy robach a little later. Next tonight, though, to a new study, when it comes to Drowsy Driving and the danger right next to you on highways across this country. Abcs gio benitez with the new findings tonight. Among them, that Young Drivers are especially at risk when it reporter tonight, a startling new look at the growing sleeper threat on the road. You remember this fedex truck weaving. A sleepy driver allegedly at the wheel. Then watch as it slams into a car, losing control. But in that new report, teens and young adults are now to plame for more than half of these crashes. Nearly 84 million fatigued americans drive every day. Last year ago, 5,000 people killed. Companies like volvo Offering Technology drivers with automatic brakes. Im trusting it, no brakes, no brakes. No brakes. Reporter wow. And alert systems. Here we go. Driver alert. Time for a break. Reporter and david, experts say the increase in teen Drowsy Driving due in part to digital obsession. So, while the problem is new, there are some old solutions. Go ahead and turn your radio on while you are driving or open that window to let that fresh air in or even stop when you are works. Gio, thank you. There is still much more ahead on world news tonight this monday. Another female jogger discovered dead. The second young woman in less than a week now. News coming in on the investigation, and the new warning from now this Second Community tonight. Also, the murder mystery in san francisco. The College Baseball star killed near a popular tourist spot. Authorities say he was attacked while playing pokemon go. And then later, right here tonight, the french gymnast who broke his leg from the new image and message from him tonight. Michael phelps, already winning gold as we just heard from matt, but so many asking, what is the other color there, those marks . Amy robach, standing by tonight. Shes got the Science Behind what Michael Phelps did. It smok. I have smoked for 30 years and by taking chantix, i was able to quit in 3 months and that was amazing. Along with support, Chantix Varenicline is proven to help people quit smoking. Some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. Some had seizures while taking chantix. If you have any of these, stop chantix and call your doctor right away. Tell your doctor about any history of Mental Health problems, which could get worse or of seizures. Dont take chantix if youve had a serious allergic or skin reaction to it. If you have these, stop chantix and call your doctor right away as some can be lifethreatening. Tell your doctor if you have heart or blood vessel problems, or develop new or worse symptoms. Decrease alcohol use while taking chantix. 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Most allergy pills only control one inflammatory substance. Flonase controls 6. And six is greater than one. Flonase changes everything. . Next tonight, there are now two separate murder mysteries under investigation. Police are looking into the second death of a female jogger. A google employee, found dead in massachusetts. York. Abcs linsey davis with the new warning tonight. Reporter tonight, residents in princeton, massachusetts, are on edge. Authorities are warning them to use an abundance of caution, after discovering the body of 27yearold vanessa marcotte, who disappeared while jogging on sunday afternoon. We have a young woman who appears to be a murder victim. And you cant be too careful right now. Reporter marcotte was visiting her mother in massachusetts, but she lyes in new york city, where she works for google went for a jog and never came back. We do not know if this was a random act. Reporter marcotte was found by a police k9 unit in a wooded area half a mile away from her mothers house. She is the second new York Resident to be killed in less than a week while going out for a jog in broad daylight. On tuesday, Karina Vetranos father found her body with police just off a jogging trail near her parents home in queens, new york. Karinas mother had a chilling killer. I guarantee you, you will pay forever. Reporter Authorities Say there is nothing at this point connecting the massachusetts case with the death of karina vetrano. They are urging people to jog in pairs and Pay Attention to their surroundings. David . Linsey davis, thank you. Up next, the new headline. The new rival for amazon tonight, and will it save you money . Also, we all saw that french athlete on the ground, b it was just incredible to see. But wait until you see the image coming in tonight. And then, this athlete, taking this image, stuck in the elevator for 40 minutes in rio. 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The french gymnast get millions saw him suffer a gruesome injury, breaking his leg from the knee down. Hes now recovering after surgery, already Walking Around the hospital, seen right there with his doctor. And still in rio tonight, a tennis player from argentina seen right here, stuck inside an elevator for 40 minutes, trying to get to his match. His countrys Handball Team coming to the rescue. He got out of the elevator, went on to beat the top ranked player in the world. When we come back on a gold, but covered in mystery marks. So many asking, where did they come from . Amy robach standing by with the Science Behind it all. Houston Mission Allergy escape. For those whove gone to extremes to escape their unrelenting nasal allergy symptoms. Houston news alert. New from the makers of claritin, clarispray. . . Welcome back. Bed, clinically proven ingredient. Nothing is more effective at relieving your sneezing, runny nose and nasal congestion. 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Plus it helps support healthy Blood Pressure with vitamin d and magnesium. Finally tonight here, Michael Phelps and the mystery marks. So many celebrating his gold already, but asking, whats that other color . Amy robach, also in rio tonight. Reporter all eyes on Michael Phelps winning that 19th gold overnight. But many noticed Something Else. Those large purple circles, bruises, actually, on his right shoulder and right there on his back. Posting photos of himself during his last practice before heading son. He says its a part of his training, a treatment called cupping. An ancient far east therapy practice of placing heated glass cups on the skin, supposed to help increakrecrease blood flow reduce soreness. Phelps featured it in his recent under armour ad. Gymnast alex naddour posted this picture of himself, all with those telltale cupping becauses, which can take two weeks to heal. Cupping speeds the healing of sco overworked muscles. One thing is for sure, these athletes believe it is giving them the extra push they need. David . He got the gold. Must have worked. Amy robach tonight, thank you. And well zeile you on gma. Im david muir. I hope to see you right back right now on the list. Go retro. Find treasure in your old toy box. Turning collectibles into cold hard cash. Pac man and cocktails . The hot new trend giving old school arcades an upgrade. From drab to fab. Cheap and easy ways our exclusive with Corey Feldman about the future of the goonies. Is it going to happen . Absolutely. First on the top of the list. Team usa swim team is owning the pool at the olympics. Where else they dominate, the door pal, singing. Swimsuits and shenanigans number one. Take off the nose plugs and put on the seed belts as team usa swimmers get ready for carpool