American who won so many hearts with his tears of pure joy. Nightly news from rio begins right now. Announcer this is nbc nightly news with lester holt reporting tonight from the olympic summer games in rio. Good evening from copacabana beach. There is a lot of olympic news to tell you about. But before we get to that, we want to update you on the massive meltdown today at the d Largest Airline thats still affecting passengers as we come on the air. Tonight Delta Airlines is in recovery mode, trying to get people where they need to be after its global Flight Network goes down from a computer glitch. Passengers waiting for flights and answers. And it comes amid a troubling spate of airline commuter average was massive, stretching across the country, from washington to miami to chicago. Inside of the worldwide delta was shut down. I was like, whoa, i think im going to be kind of late. Reporter and around the world, delta passengers forced to deplane in london, the ground stop dragging on for six hours. More than 450 flights cancelled, thousands of passengers delayed. With Customer Service lines swamped, travelers took to social media to get deltas ceo detailing out an apology. Its an all hands on deck effort. Reporter the airline says a power outage in atlanta around 2 30 this morning knocked off its Computer System offline. But the Electric Company says that deltas system failed. Andrea mohammed get to new york. This happened four weeks after a computer issue caused southwest to cancel flights. After years of airline mergers, the failure could be due to decades Old Technology or human error. Today no comment from delta on why its backup systems didnt work. Theres no doubt that a fortune 500 company should have backups for these processes, if they somebodys head at the airline. Reporter tonight the backlog is slowly improving but the Ripple Effect could last for days. Here in atlanta, there is still a lengthy check in line and all of this will cost delta. The airline is now offering a fee waiver for anyone trying to rebook their flights and a 3 00 travel voucher for anyone who has a perhaps the most crowded place is on the medal stand as team usa starts to rack up gold in dramatic fashion. Its. Reporter today, team usa, swimming, shooting for gold. The best in the world are here, but what are the crowds. Rio 2016 says ticket sales topped 80 . But tonight, many seats are empty. Today we learn troubling news three days after opening ceremony. The namibian flag bearer was arrested, charged with assault, the second boxer in the athletes village to face charges, David Johnson dove for silver, while Katie Ledecky and Michael Phelps qualified for tonights events. Last night the mens 400 Meter Relay Team looked perfect in the pool. The United States will win gold in the 400 meter relay again. Reporter the fastest team in the world, with help the the greatest olympian in history. The young bucks brought tears t eyes. I was saying to nathan, i was trying to hold back as much as i could and then he started shedding tears and ryan started shedding tears and thats one of the coolest races to be a part of. Katie ledecky smashes her own record. It was great to be up there on the podium and sing the national anthem, im really proud of this. Reporter for team usa, the thrill of victory comes with the the williams sisters, threetime gold medal champs losing for the first time in the first round. Tonight the drama of the games in a quest for gold. Tonight as americans look to medal in the Aquatic Center just over my shoulder, a short time ago, the plaza behind me erupted in celebration. The brazilians in this venue right here, taking home their first gold in judo, what a moment for this hometown crowd. St little of that moment in a newsroom. It was one and gold for ryan held, you saw it in miguels story. The 29yearold North Carolina state student and springfield, illinois native had only one race to swim here in rio, and it was the third leg in last nights gold medal i caught up with him to talk about the race and the emotions he displayed during the medals ceremony. You werent supposed to be here, when i say that, no one really expected you to qualify for rio. Thats very true. Did you expect to qualify . No, i mean this time last year, i was honestly just thinking about u. S. Nationals, making a final, maybe make the World University games, never the olympics. The emotion came from last night, during the medals ceremony . Yes. That was a combination of the progression of having the past four years, and just thinking about everyone in the swimming community, from the springfield area, the raleigh area, and just remembering how much support and love they showed me. As youre racing, are you in some ways hearing the cheers mind inside me is thinking, like, im doing this for everyone back home, im doing this for all of the swimming fans out there. But most of the time, its just the sound of my own thoughts just telling myself to go, i can handle the pain, come on, push through it, this is for something bigger than me. What is it like to come right after a legend like Michael Phelps and hes given you a pretty good lead at that point. Couldnt let up any ground if we wanted a shot to win. And describe your moment of standing there and hear our anthem and getting that gold. It was just an amazing moment. This time it seemed a little sweeter, seemed a little more emotionally attached to me, that i know the emotion just kind of manifested into tears. What were the other guys saying to you. He put his arm around me, he was like, hey, man, this is your time, take it all in and be happy. And then as we got to the podium, Caleb Russell started crying and i was like oh, my gosh, you guys are going to make me cry. Part of my conversation with ryan held, and i can tell you firsthand, there were plenty of missy eyes in the viewing stands too in that moment. Thers transition as we turn now back home to growing questions after a tragedy on the worlds tallest water slide. A 10yearold boy died while on the 1 68foot slide at a Kansas City Party as investigators are trying to determine what went wrong. Nbcs blake mccoy is there for us tonight. Reporter the verschect. Schlitzer bahn water park is not saying what went wrong, only that a full investigation is under way. The slide is 17 stories high and can reach speeds of 65 miles an hour before shooting up a hill and back down again. Witnesses tell our affiliate kshb it was boy was launched airborne, out of the craft and on to a safety net. You put your kids on a ride and you think theyre safe and theyre not. This video from a travel channel documentary, shows rafts flying off the ride during testing. The opening was delayed three times as protective netting was added and parts of the slide were rebuilt. Serious injuries have been reported. A schlitterbahn spokesperson says they check all the rides in the park the beginning of each season and before each opening. Reporter tonight a 10yearold boy is dead, with few answers as to what west wrong. The investigation here in kansas is being led by local police. Tonight we have plans to reopen on wednesday, that slide, though, will remain closed. Lester . All right, blake, thank you. Tonight there are head winds facing donald trump. Trump trailing Hillary Clinton by 13 points on a monmouth poll out today. And as trump tries to flip the script on the figures are trying to explain the problems they see. Reporter today 50 of the countrys leading National Security officials who worked in republican administrations have had enough. Signing a letter refusing to vote for trump. That list including former cia director michael hayden, former security chiefs Michael Chertoff and tom ridge. The Group Warning the gop nominee would be the president in american history. Using the citys struggles as a backdrop to refocus his message. The city of detroit is the living, breathing example of my opponents failed economic agenda. Reporter coming off a bruising week in which he faced a bruising revolt, republicans are getting in line. We are going to use the same brackets they reporter trump vowing to reform tax policies and renegotiate trade deals. He said nothing about how were going to get our entitlements under control. Reporter clinton rallying in florida called it more of the same gop talking points. He wants to basically just repackage trickle down economics. Reporter a bright spot for trump this weekend, support from george p. Bush, the son of a former rival jeb bush, the Campaign Says that with three months to go, their candidate will continue to defy political gravity. The rising star who just shattered her incredible world record here in rio. Handless the pressure. And a lot of people have been and a lot of people have been asking, what are thoser lowek pain sufferers, the search for relief often leads. Here. Here. Or here. Today, theres a new option. Introducing drugfree aleve direct therapy. A tens device with high intensity power that uses technology once only available in doctors offices. Its wireless remote lets you control the intensity. And helps you get back to things like. This. This. Or this. And back to being yourself. Find yours in the pain relief aisle. Get your active game on at kohls. This week only at kohls. The more nike you buy at 25 off. The more kohls cash youll earn no limit use your kohls cash later on just about anything points on nike purchases now thats the good stuff. Kohls. Dont let dust and allergens get between you and lifes beautiful moments. Flonase gives you more complete allergy relief. Most allergy pills only control one inflammatory substance. Flonase controls 6. And six is greater than one. Flonase changes everything. . You wouldnt believe whats in this kiester. A farmers market. A fire truck. Even a marching band. And if i can get comfortable talking about this kiester, preparation h. Get comfortable with it. Were back now with a Young American athlete who is quickly becoming one of the biggest stars at the rio olympics. The country watched in broke her own record to win gold in the womens free style. Reporter cady ledecky was the youngest member of team usa. She was a virtual unknown. Then this happens. Not only did ledecky win the 800 meter free style. Ledecky is a gold medallist. Reporter she obliterated the field by more than four seconds. She looks at the time, oh, my god, what i have done. Reporter at what point did you realize, oh, my goodness . It was right as i flipped at the 200 point. I flipped and it was like i just woke up from a dream. It was like one im at the olympics, two, im in the finals, three, im winning. Katie, dont mess this child, katie loved swimming. We started out swimming competitively at only 6 years old, and i think that katie saw how i loved the sport and she wanted to be like me. Reporter growing up katie said she never thought she would be an olympian. In fourth grade, i break my arm playing basketball in gym first questions i asked the doctor is there any way i can still be in the water, and he gave me this special plastic bag that was very tight on my arm and so i went to plastic every day and found a way to get better at kicking. Reporter that drive and discipline, are still the foundation of her daily routine. Its all about la ledecky, how fast she will go. The hard working maryland has broken four World Records here in rio. Watching her swim is not just exciting for fans, but a thrill for someone she once considered super human. People talk, did you see that . Did you see how fast she went . Thats just cool to watch. Reporter ledeckys focus is on rio, where many will be focused on big target on your back . Im just going to lay it down and do the best i can. Reporter and her best may end up being the best in the world. Matt lauer, nbc news, rio. Were back in a moment with a multibillion dollar bet aimed at luring customers away from the ford freedom sales event is on our biggest event of the year just got better . Im free to do what i want and have a good time. . So hurry in for 0 financing for 72 months. Thats freedom from interest. And freedom to choose with ford. Americas best selling brand. . Im free, baby . Now get 0 financing for 72 months across the entire lineup of ford cars, trucks and suvs, during the ford freedom sales event. Gary, gary, gary. I am proud of you, my man. 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Finally tonight, it was the burning question on social media all across the country last night as Michael Phelps gathered with his teammates by the pool before their gold medal swim. What were those circular markings all over her upper back and shoulders. Turns out theres a very good explanation, something thats been known in hollywood circles for quite a while. Reporter hes the recognizable olympian, at these games decorated in unrecognizable marks. Michael phelps brandishing pool side some bruises that left americans guessing. One person on twitter, michael probably just fell asleep on his medals. Those giant spots are part of a physical therapy routine. I personally dont like walking out attacked by an octopus. This asian tradition may help athletes winning. Reporter for many of us those red dots first appeared on the red carpet, Gwyneth Paltrow making her own fashion statement. The man making those whel u soup of popular therapies from cups to hot tubs. Its like asking your best chef about the garnishing hes using. That does not look healthy. Reporter and phelps keeps them on for five minutes. Already leaving its mark on these games. Peter alexander, nbc news, rio. Thats going to do reminder nbcs prime time olympic coverage begins at 8 00 p. M. , 7 00 central, its going to be a being night for swimming. Im lester holt, it was latterday machine guide it was louder than a machine gun. With the construction keeping neighbors up with no warning. The olympics are in full want to watch for tonight. The 2016 games taking place. On downtown cleveland and im trying my best at the balance beam. Im not doing a great job but we will also talk about chances for rainfall that we desperately needed. The new approach to football that the Cleveland Browns organization is teaching kids to ensure safety. This is channel 3 news, it is time to fall in love with your home again. Channel 3 news at 7 00. Some west side even citizens are making noise about noise