World headquarters in new york, this is nbc nightly news. Reporting tonight, lester holt. Good evening. They are off and running. Late today, on the heels of Hillary Clintons official entry into the president ial race yet another longanticipated name joined t florida senator marco rubio addressing supporters just a short time ago in miami formally declaring his bid for the republican nomination. Meantime, just over 24 hours under her twitter launched candidacy, Hillary Clinton has barely been seen, apparently by d only sightings of her posted online as she makes her way to iowa by car. Yes, its her on a Security Camera video at a fast food restaurant. This has started out at least as a very lowkey campaign ki were covering both Campaign Launches tonight. Andrea mitchell starts us off in des moines, iowa. Andrea, good evening. Rep evening, lester. Its certainly an unconventional launch. Her campaign for the presidency. One of the best known women in america on her road trip here to iowa stopping at coffee shops like this one and trying to blhe for her first day on the road, this was the only evidence Hillary Clinton was campaigning. Her tweeted picture from a gas station stop near altoona, pennsylvania. And pictures from chris lern, a College Student who bumped into her. Literally when i walked out the door i saw her and i was like, oh, thats her. I didnt even realize shed be here. It was funny, though. Reporter this afternoon Security Camera video of her ordering a chicken bowl with guacamole at a chipotle outside tole tantalizing hints of a seemingly carefree jaunt from the clinton estate in chappaqua across key battleground states. More than a thousand miles to her first public event tomorrow carefully choreographed to reintroduce Hillary Clinton as the selfdeclared champion of Everyday Americans like those seen in. Weve been doing a lot of home renovations. But most importantly we just really want to teach our dog to qui the trash. Reporter trying to recreate the voting blocs of the winning combination from 08. Women, latinos millennials. Like this couple who said they had no idea the interview they did two months ago would be part of her campaign announcemen we were p shocked. I rushed home and by the time i got home my phone had already exploded. Reporter and a group with growi political cloutgays. We invited Hillary Clinton to come to o reporter it did not mention her most recent job, secretary of state and questions shes sure to face about Foreign Policy failures like benghazi or more rece deleted emails. Instead shes borrowing language from critics on the left like senator Elizabeth Warren about the economy. But the deck is still stacked in favor of those at the top. So im hitting the road to earn. Reporter some Iowa Democrats still need to be convince i havent made up my min i want to see all the candidates and hear what theyve g say before i make up my mind, but im really excited a her joininth i wou a woman in the white house. I am concerned about the clinton, bush, clinton, bush you know that theres just been so much talk of clinton reporter and so she gets here tomorrow, shell meet people in small groups trying to reconnect with the very voters the iowans who rejected her soundly, she came in third when she ran for the presidency last time around in iowa. Lester . Andrea mitchell by contrast republican senator marco rubio is making a very Public Entrance into the race. Kelly odonnell is i miami where rubio just made it official in front of a pumpedup hometown crowd. Hi, kelly. Reporter hi, lester. Candidates rarely make their announcements in the evening, but marco rubio did. He came here at the precise time of 6 03 p. M. To make sure that Cable Networks like the conservative home of fox news would carry it live for a friendly audience and the location was also intentionally. The landmark, miamis freedom tower. The ellis island for cuban refugees who fled Fidel Castros regime a generation ago. The legacy. A crowd of supporters who registered for tickets came to see a bluecollar son of cuban immigrants. You know, i think we need somebody who is real. I think thats so important. Reporter tonight senator marco rubio launched his run for the republican nomination appropriately in the place where his parents entered the country. I live in an exceptional country where the son of a bartender and a maid can have the same dreams and the same future as those who come from power and privilege. Reporter earlier rubio stopped by to rehearse all smiles, but taking no saving his thunder for later. Senator, youre the youngest candidate. Are you prepared president , sir . At a local lunch spot florida voters told me they can relate to rubio. He is a younger candidate compared to some. What does that mean to you . I think like i do. And have same views as i do. Reporter like the extra sugar heaped in cuban coffee, here rubios heritage sweetens his appeal. What do you think rubios biggest strength is . His background. His double culture. The united. Reporter rubios quick political rise does include some awkward moments. Pressure appeared to get the better of him with that water break delivering the gop state of the union and now more personally. Rubio is challenging his own mentor, fell Floridian Jeb bush, who is also expected to r f and rubio is the third firstterm senator to get into the race, but unlike ted cruz and rand paul, hes more establishment than tea party. And unlike rand paul his aides tell me that rubio will not seek reelection to the senate while hes running for president. Lester . Im joined by chuck todd our political director and of meet the press. Lets talk about the timing of the rubio announcement in the wake of the clin announcement. Does it he a contrast . Well, look, it does. Obviously, he would like t lets not pretend he wants to be overshadowed and have this splitscreen mome however theres a way for him to make lemonade. He did it well in this speech. Hes generation x, shes a baby boome by the way, marco rubios chief primary opponent is jeb bush, another baby boomer. So hes able to make that point quite a bit, that hes abo. You talk to anybody, president ial campaigns are always about the future. This is something th Clinton Campaign is very worried about theyre hoping her gender, the idea of electing the first woman president will do that. And lester, one othe note and this is why generation matters. Five of the last six have been won by the younger candidate. Voters instinctively respond to the future sometimes by going with the younger candidate. Were going to see others jump very quickly, jeb bush among them . I think were going to see a little bit of a lull here next couple of weeks, and then watch out for may. Thats when youre going to see officially Hillary Clinton with her b speech and then everybody else like planes on a runway, ben carson, jeb bush, you name it. May will be a big announcement month. All right, chuck, than. Senator rubio will appear live tomorrow morning on now to the shocking video adding fuel to the firestorm over use of police force. It shows another incident in which Law Enforcement fatally shot an unarmed man. We learned late today charges will be brought in this case though the Sheriffs Office says it was an accident. I got you. I got you. Reporter police video of a sting operation in oklahoma. The suspect bolts from undercover agents with the tulsa county Sheriffs Office and is chased. A scuffle is picked up by a police body cam. According to police, one deputy says, taser. Roll on your stomach. Now. Reporter but then 44yearold eric harris, who Authorities Say had an extensive criminal record, is not tased but shot. Immediately a voice is heard. I shot him. Im sorry. Reporter officers then subdue harris. One kneels on his head. Im losing my breath. Reporter the man who pulled the trigger is 73yearold bob bates, an Insurance Broker who volunteers as a reserve deputy. The Sheriffs Office says he mistakenly pulled his handgun instead of his taser and fired. Harris died later. He believed he had a less lethal device in his hand and he was going to administer a less lethal taser probe when in re he had a firearm in his hand. Reporter the Sheriffs Office says reserve deputies are members of the public, doctors, bankers, even retired Police Officers who receive varying degrees of training. Bates donated thousands of dollars in equipment, and the Authorities Say his role in this operation was in a. If he had as much training as he supposedly had, he would definitely know a. 357 from a taser. Reporter while a Sheriffs Office investigation recommended bates not be charged, late today the tulsa County District attorney did charge him with Second Degree manslaughter. Kevin tibbles, nbc news, chicago. The images from that tulsa shooting emerge less than a week after the country saw video of an officer in South Carolina fatally shooting an unarmed man running away from him. Tonight more dash cam video is filling in gaps about what that officer did in the aftermath. Nbcs Gabe Gutierrez has that for us. Reporter just minutes after officer Michael Slager shot and killed walter scott, we hear his voice on his dash cam video speaking to an when you get home, probably be a good idea to kind of jot down your thoughts or what happened. Okay. You know, once your adrenaline quits pumping. Its pumping. Oh, yeah, oh, yeah. Reporter then slager is heard speaking with someone else on the phone. Hey, everythi okay. Okay . I just shot somebody. Reporter now, there are calls to charge other officers on the scene who claimed in written accounts they rendered first aid, including cpr. Thank god for video because what we see is is that there was a very different encounter that actually hap i havent seen all of the videos yet, but i know that the one officer did try to prevent the bleeding. Reporter also today a second man came forward to claim slager used Excessive Force. Julius wilson, seen here in this dash cam video says slager tasered him in 2014 even though other officers had alr how painful was it . Excruciating. Reporter last week Mario Gibbons said he was planning to sue claiming slager used Excessive Force by tasering him the. Slager now charged with murder has not yet entered a plea his new attorney is declining to comment. The state investigation into the Walter Scott Shooting is expected to last at least until next week. Some residents here praised city officials for charging the officer within days but right behind me others just finished protesting calling for change lester . Gabe gutierrez, thank you. Four americans received lengthy prison sentences today for an infamous incident during the iraq war. All four are former blackwater security contractors convicted for the killings of 14 unarmed iraqis including women and children in baghdad in 2007. Nicholas slatten was sentenced to life in prison. He was the only one the other three each got 30 years in prison. Spring means storms and a dangerous one swept through northcentral texas this morning creating flash floods in ft. Worth that moved in so fast some people were forced to abandon their. The water reached waist high in some areas, and its not over. More rain is expected in the region throughout the week. Still ahea tonight, late and lost b new rankings are out. Which Airlines Fare the best and worst . Plus oneway trip. 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One tried the newest allergy spray which could take several days to feel the full effect of relief. The other took claritind which starts to work on allergies with nasal congestion in 30 minutes. The moral . Nothing works faster than claritind. Tonight researchers are out with their annual list of best and worst up in the air. If you thought more flights were late and more bags were getting lost, Government Data as far as ontime performance goes, Hawaiian Airlines is best. Envoy air, which operates most American Eagle for lost bags, Virgin America is best, envoy is worse. Consumer complaints are also up with Alaska Airlines receiving the fewest and Frontier Airlines receiving the and if youve flown on a commercial plane over the past 30 years or so theres a good chance youve ridden on an md80. Its a plane some passengers might complain about because its so old, but one pilots love to fly. Week by week the airline that flies the most md80s, american, is retiring them to make way for more modern planes. But where do the on their final flights . Nbcs tom costello went along for reporter its the sunday night run, baltimore to dal thank you. Reporter but what none of these travelers knew b booking thei is that this is the last time this plane will ever carr passengers. This is this aircrafts final flight. They are retiring it. Reporter after 23 years tail number n595 is at the end of its life. As American Airlines slowly retires what had been the backbone of its fleet. All 370 of its md80s built by Mcdonnell Douglas before the fully automated cockpits of today. The kind of plane oldschool pilots love to fly like an old shoe. Theyre very comfortable in it. Its such a reliable, just good solid airplane. Reporter after passengers departed 595 was off again, headed for its final resting place. On its log books 71,000 hours of flight time. More than 31,000 takeoffs and landings. That means over the course of this planes life more than 4 Million People have flow. It wasnt long before we were on the ground in roswell, new mexico, the dry boneyard for hundreds of planes that have served their time. Every make, model and brand. Many of them cannibalized to keep planes that are still flying in the air. This is where planes go to die, dismantled piece by piece. This once proud 747 now a relic. Its really an inglorious end for these icons of the jet age, now salvaged for spare parts and scrap metal. But more modern, more fuelefficient planes mean this pilots favorite is nearly obsolete. So every week for the next two years yet another md80 will touch down for the last time. Tom costello, nbc news, roswell, new mexico. We have late word tonight of an emergency involving an Alaska Airlines flight from seattle bound for los angeles. The airline says that shortly after takeoff the pilot repo hearing bangin after immediately landing back in seattle, a ramp was found inside a front cargo hold. The airline says the worker appeared okay, but was taken to the hospital as a precaution. The aircraft was in the air for a total of 14 minutes. No word yet exactly how this happened. The incident is obviously under investigation. When we come back, how young is too young for children to walk off on their own . A case that got a lot of attention is back in the spotlight tonight. Well tell you about it. Making a fist something we do to show resolve. To defend ourselves. To declare victory. So cvs Health Provides expert support and vital medicines. Make a fist for me. At our Infusion Centers or in