York, this is nbc nightly news, reporting tonight, Kristen Welker. Good evening, we begin with a potential danger in the sky averted this weekend. Two United Airline pilots arrested saturday morning on suspicion of being under the influence of alcohol. They were scheduled to fly 141 passengers from scotland to newark, new jersey. Its not the first time this year pilots have been taken into custody for alleged intoxication. In this case, aviation experts say the system worked, but some passengers on that united flight were left shaken and frustrated. Morgan radford has our report tonight. Reporter Authorities Say the two pilots are 35 and 45. Their identities still not confirmed. They were supposed to be flying united flight 162 scheduled to leave scotland at 9 00 a. M. Yesterday with 150 people on board. But then, confusion. One passenger tweeting, what is going on . Police in the tunnel. Very little information. It turns out the pilots were arrested suspected of being drunk. If you are uncomfortable with a member of your crew, you dont fly with them. The safeguards that are in place did, in fact, work. The entire crew was replaced and the flight was delayed ten hours. Finally landing in newark at 8 45 last night. Today other passengers there voiced concerns. Pilots on a plane drunk absolutely concerns me. The two pilots have been removed from service and their flying duties. We are cooperating with the authorities and will conduct our own investigation as well. This isnt the first time this happened. A flight to philadelphia cancelled and a local pilot charged. In march American Airlines pilot failed two breathalyzer tests before takeoff and was arrested. He pled no contest and was put on probation. In april of last year jetblue pilot Dennis Murphy flew 151 passengers from orlando to new york while allegedly under the influence. Just yesterday a reminder of the great responsibility pilots have after an engine problem forced a southwest flight to make an Emergency Landing in florida. Passengers praised the pilot. Were definitely grateful we were watched over and we had good pilots. As for the two pilots arrested this weekend, they are being held at a Police Station in scotland. A long flight for those passengers finally arriving here in newark. Meanwhile, those two pilots are expected to appear in Court Tomorrow morning. Kristen . Morgan, thank you for that report. In louisiana now tragedy for a group of workers headed to flood ravaged baton rouge. Two people including a local fire chief were killed and more than 40 injured when their charter bus crashed into several vehicles. Police say the bus driver does not have a license and admitted hes an undocumented immigrant. And now to politics and questions over Donald TrumpsSignature Campaign issue deporting undocumented immigrants. Also tonight were getting a look at the stark differences in how trump and Hillary Clinton are prepare ing for their very first debate. We have two reports tonight beginning with jacob rascon in iowa. Whats the latest there . Reporter kristen, good evening. The Trump Campaign working overtime to calm nerves. Some worried trump seems undecided on a key component of his immigration policy just 71 days before the election. Donald trump off the trail, but his campaign busy today contending he hasnt budged on his signature issue. What he said is consistent. Hes been consistent. His position and principles have been absolutely consistent. After repeatedly declaring during the primaries that every last undocumented immigrant must be deported. They have to go. What if they have no place to go . We will work with them. Trump now singling out criminals, a fraction of the 11 million undocumented immigrants. On day one, im going to begin swiftly removing criminal Illegal Immigrants from this country. But what would a President Trump do about the rest . The deportation force, i would like to address this. He hasnt mentioned that since last november. The softening is more approach than policy. The softening troubling to trump supporters. The right tone for others. I think there will be a happy medium. The Campaign Today challenged on minority outreach including his i told you so response to the shooting of dwyane wades cousin. Donald trump has a plain spoken way about him. His Campaign Manager asked how many times has trump spoken directly to minority audiences. Would you be surprised if the answer is never . No, i would not be surprised. Those events are being planned. Stuck on defense, the Trump Campaign ready to shift the focus back on Hillary Clinton. Jacob rascon, nbc news, des moines, iowa. This is Kelly Odonnell in washington. Just four weeks, two very different playbooks. Our leaders have stupid. Our politicians are stupid. Heading into the ultimate debate stage oneonone. I was the first one to call him out. I called him out when he was calling mexicans racists. Today in his weekend home, donald trump did debate prep his way. Hes an unconventional candidate. Hes not going to prepare the way hillary does, which is cram her head with these binders. No formal rehearsal, just hashing out ideas over lunch with friends and family. Including former executive roger ails and radio host laura ingram. Trump has resisted traditional mock debate practice and plans to rely more on his gut. Meanwhile, today Hillary Clinton is on the fundraising circuit with four events in the hamptons. This weekend celebrity supporters, actors Ashton Kutcher and jason george helped out Clintons Campaign while Barbara Streisand hit send to raise cash. Clinton has been carefully preparing her responses to meet debate time limits. Her advisers call trump a formidable adversary. Its going to be difficult. Youre going to have to prepare for many different trumps. Wellbehaved, modest trump. I doubt well see that. Kind of off the rail trump. Holding fewer Public Events right now as she raises money, clinton will call on her most famous surrogates, president obama and Joe Biden Campaign without her in the next couple weeks. Kristen . There are going to be a lot of eyes on those debates. Kelly, thank you. We want to turn now to the tropics where there are several systems threatening parts of the gulf and east coast. Nbc meteorologist Raphael Miranda is tracking it for us. Were tracking three storms in the atlantic. One a major hurricane. Thats gaston moving out to see. But depressions 8 and 9 will affect the southeast. This is the one we have been tracking day after day. It finally got better organized today. Winds at 35 miles per hour. Moving over the warm waters of the gulf of mexico likely to strengthen to a tropical storm. This will make landfall some time towards the middle of the week exactly where remains yet to be seen. Very heavy rain in florida over 6 inches possible in southern florida. Our next tropical depression is headed toward the carolinas. Thankfully also looks to curve out to sea. Still needs to be watched closely in north carolina. Kristen . We will continue to track all of that. Thank you for that. Overseas to the ongoing devastation in syria. More than a dozen civilians were killed when bombs fell on a funeral procession this weekend. Efforts to deliver muchneeded food and medicine are now on hold. Heres nbcs matt bradley. Reporter in the besieged city of aleppo, even the dead still face the horror of war. On saturday barrel bombs struck mourners paying their respects to victims of a previous bombing. When ambulances arrived, they were greeted with another round of bombing. Its called a double attack. Twin attacks for maximum casualties. Another reminder that civilians continue to bare the brunt of this war. Observers say 440 have died in aleppo alone. More than a quarter of the victims, children. The u. N. Says russia agreed to a ceasefire to let food and medicine into the city. The fighters themselves havent agreed. Theres been some progress, a deal between rebels and syrias government ended a years long siege last week. Thousands of civilians and fighters were able to leave. But at what cost. Here departing evacuees are heckled by government troops. Many syrians worry a ceasefire means surrender and loved ones will have died in vein. A choice between humiliation or death. Matt bradley, nbc news. Devastating indeed. Back here in this country, its the question that will be asked at your next job interview. The state made it illegal for tammie leidner has more on that. For serve years ann marie fought for the same pay as her male counterparts at the university of massachusetts. We graduated from the same school. The same university on the same day. We have the same event of professional experience. You were doing the exact same job, but not making the same pay. Exactly. After a long battle with her employer and testimony before congress on pay inequality, the single mother was awarded the same salary as her male colleague. Nbc news reached out to the school that said its unable to comment on personnel matters. This month in an effort to close the widespread wage gap the governor of massachusetts signed a pay equity bill into law prohibiting companies from asking perspective employees their current or past salary history. Whats passed here in massachusettes is going to be a model used in the rest of the country. Reporter victoria directs the women in policy program at harvard and says the pay gap can last a lifetime. This matters so much because often if people get a lower salary than their skills would have warranted early in their career. If an employer can benchmark, you get a snowball effect. When boston attorney was job hunting, she was questioned repeatedly about her previous salary. They are asking for your entire salary history. So it almost felt like in some ways i had to justify why i was asking for a certain percentage or increase from what i was making. She says this may have cost her thousands. Was there ever a point you felt like maybe you were asking for too much . Definitely. There were times i felt like, okay, well, maybe i can take a pay cut. For both satisfaction in knowing the Playing Field is now more level. Its exciting to me that folks will have the tools that they need so they dont have to go through this. So its promising. Tammie leidner, nbc news, boston. Nasa may be getting closer to a Human Mission to mars. A team of scientists emerged after being kept from the outside world for an entire year. They simulated what life would be like on the red planet. Reporter after a year of total isolation, today they are returning to civilization. Im super excited because its the first time we get to be outside. Enjoy mars. Reporter six scientists walked into this 36foot wide solarpowered dome last august. Im looking forward to getting to act like an astronaut for a year. On the rugged slope, its the longest ever nasa mission to understand how a yearlong space trip would affect astronauts. Inside to replicate what life might be like, no running water, cooking with freezedried food and their only window to the outside world. Thats the view from simulated mars. The world is a long ways away. You still have a good time. Get to do science and learn how to cook. And theres no rain. Emails with family and friends are on a 20minute delay replicating the 35 million mile distance from mars to earth. Going outside required wearing a full space suit. They conducted experiments on plant growth and water, but the big question today are they still friends . We could definitely use some other time to talk to other people. Plus fresh fruit and a beer, saying goodbye to their home sweet dome. Nbc news, los angeles. Now that is incredible. Still ahead, stopping the zika outbreak with mosquitos. The push to use genetically modified mosquitos here in the u. S. I wodont know where id be without itre so when i heard about conartists committing medicare fraud. It made me so mad i wanted to give them the old onetwo one, never give your medicare number to get a free offer or gift two, always check your medicare statements for errors these crooks think were clueless, they dont have a clue its your medicare, protect it see more ways to fight fraud at medicare. Gov fraud toilet flush if you need an opioid to manage your chronic pain, you may be sooo constipated it feels like everyone can go. Except you. Tried many things . Still struggling to find relief . You may have opioidinduced constipation, oic. Its different and may need a different approach. Opioids block pain signals, but can also block activity in the bowel. Which is why it can feel like your opioid pain med is slowing your insides to a crawl. Longing for a change . Have the conversation with your doctor about oic, and ask about prescription treatment options. Made on behalf of those living with chronic pain and struggling with oic. Were back with a new push to get control of the zika outbreak by the same way its being spread. Were talking about mosquitos. Its an innovative idea approved by the fda, but is it safe . Heres nbcs gabe gutierrez. In the sleepy florida keys, theres a political storm brewing. A fight over government, science and now zika. I would absolutely feel like a ginne pig. The local Mosquito Control district is looking into a plan to be the first testing ground for e genetically modified mosquitos to stop the spread of diseases. The insects would be released in key haven. They called it jurassic science. Whats being objected to is the safety for the environment and the people. Mosquito eggs would be injected with a specific gene. When they mate with e females, their offspring die more quickly reducing the mosquito population. A scientist with a British Company behind the project. We have done trials in brazil where in every single case we have shown over 90 of the control of the mosquito population within six to nine months. Reporter the debate has intensified amidmounting fears of zika virus. Federal Health Officials issued travel warnings for pregnant women and parts of miamidade county. But with no cases of home grown zika yet in the keys, the risks outweigh the benefits. These cannot be recalled. Once they are out there, they are out there. Theres not enough information. They are mounting a campaign to vote down two referendums this november. Gabe gutierrez, nbc news, miami. Coming up, we go to a critical swing state, iowa. 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That is until one of you clips a food truck ruining your perfect record. Yeah. Now you would think your Insurance Company would cut you some slack, right . No, your insurance rates go through the roof. Your perfect record doesnt get you anything. Anything. Perfect. For drivers with accident forgiveness, Liberty Mutual wont raise your rates due to your first accident. Liberty stands with you. Liberty mutual insurance. Wac a become to back to politics, the state of iowa could help determine who wins the white house and the number one concern for voters there is jobs. Its an issue thats taken on fresh urgency days after hundreds of positions were cut at one large company. Nbcs Jacob Soboroff talked to voters there. These two buildings are part of the original part of john deere manufacturing. And today . They are over here in the new facilities here. Were down to maybe 3,000 employees. Robbie was a factory worker at john deere until he became one of many on the Assembly Line who were recently let go. 100 people losing their jobs. The company says that workers like robbie get laid off due to the ups and downs of the market. Deere added more than 600 workers but have since then they have shed more than 1,000 jobs. Hansens dairy farm is just outside waterloo. Blair hansen is the sixth generation to tend to these fields. How old is this tractor . Early 80s. John deere . Yeah. I heard they have been laying people off. Corn prices are low. Farmers cant afford to buy new tractors. The plants slow down and they have to lay people off. When it comes to the candidate between clinton and trump, you have a feeling one way or the other who can bring jobs like the ones that were lost back . I would say trump has the better chance. Hes a businessman. Hes going to look out for business people. In this county where Bernie Sanders and ted cruz won the iowa caucus, who can bring the deere jobs back is up for debate . Even within the hansen family. Maybe ill go around on the next round of president s. Im going to say a he. Got to be he. He. She. I dont want either one of them. Id have to go green. She. Hillary clinton . Yes. I know what blair thinks. Ross perot. Like their fellow iowans, the they have two months left to debate candidate is best for their neighbors. Until the political harvest of the november election. Jacob soboroff, waterloo, iowa. Thats the way to talk about politics. Thats for sure. We have a sad note to report from the music world tonight.