another jet skidding off the runway in houston. a tire coming off at takeoff. and this engine fire. have america's skies hit a new crisis in confidence? also tonight the inescapable rematch. it's biden versus trump kicking off today. they're both in battleground georgia. >> hello, georgia. i'm thrilled to be back in rome. and new airdrops today in gaza on the brink of famine. >> in tel aviv, we're just ahead of ramadan and hopes for a pause in fighting fading. wicked weather. tornados shred the south while the east coast gets soaked. millions under flood watches. plus spring break begins in miami with a buzz kill, a crack down. >> in miami beach with the spring break crack down under way. and later, catching up with the atomic clock, proof that if you needed it, that every second counts. >> you just add a second to one day. you keep everything aligned. >> it's mind-boggling. >> it's pretty wild. >> announcer: this is the "cbs weekend news" from washington with adriana diaz. good evening. i'm mark straussman sitting in for adriana on a busy news saturday. as we come on the air dueling in georgia, a key battleground state. but first tonight more issues for united airlines. another midair diversion today, this one in chicago. the problem, an oil warning light. on friday night this united airbus made an emergency landing at lax because of a hydraulics issue. for the airline two disruptive incidents in the last 24 hours and six in the last week. and while no one was hurt, it's part of a pattern of problems taking flight in commercial aviation. cbs' elyse preston has more for us now from los angeles. elise? >> reporter: mark, good evening to you. it's been a tough week for united airlines and its passengers. six different jet liners have had problems, some forced to make emergency landings including one late friday here at lax. the plane was united airbus a320 with 110 people onboard. it was headed from san francisco to hex co city but forced to land here after the crew reported a hydraulics issue. >> we're going to have to stop on the runway. >> reporter: everyone got off safely. it was one of six plane problems for united just this week. >> oh, my goodness. look at the back of the plane, man. >> reporter: this jet slid off the taxiway friday while landing in houston. >> it was more scary when you slid off and you realize the whole plane and we're in the dirt. >> reporter: also a wheel fell off a 777 on takeoff in san francisco thursday. >> the tire is going down the runway. >> reporter: on monday two more incidents including this midair engine fire. in a statement united described these incidents as distinct and unrelated to one another. >> when you're operating as many flights per day as we operate in the united states, somewhere along the line there's going to be some sort of an anomaly. but this does not mean the system is unsafe. >> reporter: united isn't alone with problems. an american airlines jet in miami clipped the tail of a parked frontier jet. today a new development in this near disaster when an alaska airlines boeing 737 max 9 lost its so-called door plug in the air. the justice department now launching a criminal investigation. still, this flier today not worried yet about airline safety. >> you think about how often those things happen, and you just have to believe, you know, they're rare. >> elise, commercial aviation has had so many issues in recent weeks. is travel overall affected? >> reporter: well, mark, for the most part, despite the problems, flights are on time even as we head into the busy spring break travel season with a record number of fliers expected. >> elise preston reporting tonight for us from lax. elise, thanks. off to georgia tonight where president biden and former president trump were kicking off their likely general election battle. and in the peach state tonight it's dueling rallies. mr. biden landed in atlanta today in what's shaping up to be the longest campaign in history. trump's campaigning in north georgia. cbs in atlanta with more. >> reporter: good evening. for the second month in a row joe biden and donald trump are holding competing campaign events in the same state at the same time. this is an unofficial shift from the primary to the general election that both candidates are still just over 100 delegates shy of securing the nominations. it's deja vu in georgia. >> thank you, thank you, thank you. i'm here tonight because you really want to do it again. because you are going to win this primary for us on tuesday and because we're going to win in november. >> reporter: the peach state the backdrop for dueling campaign rallies saturday setting up an all but certain joe biden-donald trump rematch in november. >> i don't like the fact we're doing this again. >> reporter: it's trump's first rally since his last primary rival nikki haley dropped out after super tuesday. >> they call it super tuesday for a reason. we won big. and now we're just days away from officially clenching the republican nomination for president of the united states of america. >> reporter: georgia is the second stop on biden's new battleground push that started in pennsylvania friday, and he plans to chris cross new hampshire, wisconsin, and michigan by next thursday while vice president harris stumps in nevada and arizona. >> hello, nevada. >> look, i'm not a young guy. >> reporter: team biden is also dropping $30 million on a six-week ad buy to air across those swing states, marking the start of one of the longest general elections in campaign history. president biden won georgia by fewer than 12,000 votes in 2020, one of a handful of battleground states he just narrowly won that helped him secure the white ho house. >> now to the middle east. you're watching video of a british ship shooting down houthi droeps. in all they downed at least 28 of those drones in a four-hour span. for months the iranian backed houthis have posed a threat to commercial and military shipping in the red sea. now the latest on the crisis in gaza. the u.s. organized more food drops there today. american c230 cargo planes dropping desperately needed aid to hundreds of thousands of palestinians. widespread hunger, even famine remains a humanitarian crisis there. and without a temporary cease-fire, concerns grow about a surge in violence. ramadan could begin as soon as tomorrow. in tel aviv with the latest. >> reporter: good evening. the world food program is warning that a quarter of the population of gaza is, quote, one step away from famine. aid has been slow to arrive with aid groups trucking up north where it's badly needed. as an emergency alternative the u.s. and several other countries are airdropping food and supplies. but it's not only extremely limited and costly, it's dangerous. the hamas-run health ministry says at least eight people have been killed by falling cargo after parachutes malfunctioned. the hazards of airdrops are one reason president biden announced in his "state of the union" address that the u.s. military will establish a temporary pier off the coast of gaza so aid can be delivered by sea. he emphasized there will be no u.s. boots on the grounds, but he didn't explain how long it would take. cbs news has learned the pier similar to this one must be shipped from virginia crossing the atlantic and mediterranean meaning delivering that lifesaving food, water, and shelter is weeks away. all this just ahead of ramadan, the holy month a time of prayer but violence between israelis and palestinians. that's one reason cia director bill burns was in the region pushing for a pause in fighting. mark, but with time running out and as president biden himself said, that's looking tough. >> chris livesay in tel aviv, thank you. two national guard soldiers i a border patrol agent are dead after the helicopter they were flying in crashed in texas. it happened friday near rio grande city. a fourth person onboard the chopper remains in critical condition. the cause of the crash remains under investigation. president biden issued a statement expressing condolences and adding their sacrifices will never be forgotten. in western wisconsin nine people were killed and one injured when a tanker truck crashed into a passenger van. only one person survived the crash, the passenger in the van. that person is now hospitalized. the names of the dead were not made public pending notification of family members. it's the second deadliest crash in state history. and now to severe storms affecting millions this weekend. tonight snow could return to parts of north east, and six states from louisiana to north carolina are getting drenched. this video near charleston, south carolina, today some areas could see a half foot of rain. the storm system is also spawning tornados. this damage from a twister that ripped through dale county, alabama, on friday. several homes were hit but no injuries are reported. miami beach is breaking up with spring break revelers this weekend, cracking down on the rowdy partiers that show up every march. cbs is there with more on what's behind the split. christian? >> reporter: good evening, these are the strongest measures the city of miami beach has proactively taken ahead of spring break to keep people safe. so far the measures appear to be working, but it's still early. throughout the month of march miami beach is cracking down on spring break. years of chaos including last year's deadly shootings led officials to say enough is enough. the city's entire police force has hit the streets along with some 18 other local state and federal agencies. >> what we don't welcome is criminal activity. what we don't welcome is mayhem. >> reporter: to even get to the beach you've got to go through a dui checkpoint. all lanes of traffic are down to just one. bag checks once you're on the ground, and access to the beach and a part of south beach stops at 6:00 p.m. >> if you are in our city, we expect you to abide by the law. we expect you to respect the quality of life of our residents. >> reporter: parking prices have been raised from $30 to $100 a day. liquor stores close at 8:00 p.m., and there's no outdoor seating for some restaurants on the strip. >> very concerned. >> reporter: although there's currently no curfew on bars, david, owner of mangoes tropical cafe, a fixture on ocean drive, worries what all these measures meant to keep people away will mean for businesses. >> here on fabulous ocean drive we're -- our businesses are totally choked. >> reporter: the city says it needs to do this to keep everyone safe and to drive the message home -- >> hey, we need to talk. >> reporter: the city launched this psa. >> we're breaking up with you. >> should we not be here or something like that? >> reporter: the question is will this breakup be mutual? the city of miami beach is not the only municipality on high alert, mark. florida is expected to be the top destination for spring break this year. governor desantis said those who commit crimes will, quote, pay the price. >> okay, the warning is out. and straight ahead on the "cbs weekend news," craw fish prices are soaring this year. pricey if you can find them. and superstar katelyn clark shoots past another hoops legend. and why the government is trying to figure out exactly what time it is. ♪ ("good feeling" by flo rida feat. atr) ♪ this is a hot flash. 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(♪♪) caitlin clark just keeps setting records. the iowa sharpshooter hit this three-pointer last night to make history once again. and this time she surpassed steph curry and darius mcgee with 163rd three-pointer of the college season and then she made another one. that's the most three pointers ever in a single ncaa season. and tonight hollywood has rolled out a new red carpet for the oscars literally. this after the surprise of last year's champagne colored rug. the new one's not cheap covering 50,000 square feet and costing $25,000. and the mega millions jackpot is living up to its name again. it's mega again growing to an estimated $735 million. no one had the winning ticket for last night's drawing. your next shot at hitting it big and getting really, really rich is tuesday night. the last time someone won mega millions was back in december. and next on the cbs weekend news how time keeps changing all the time. if you're looking for a medicare supplement insurance plan that's smart now... i'm 65. and really smart later i'm 70-ish. consider an aarp medicare supplement insurance plan from unitedhealthcare. with this type of plan, you'll know upfront about how much your care costs. which makes planning your financial future easier. so call unitedhealthcare today to learn more about the only plans of their kind with the aarp name. and set yourself and your future self up with an aarp medicare supplement plan from unitedhealthcare. want more from your vitamins? get more with nature's bounty. from the first ever triple action sleep supplement, to daily digestive support, to more wellness solutions every day. get more with nature's bounty. ♪oh what a good time we will have♪ ♪you... can make it happen...♪ ♪♪ try dietary supplements from voltaren for healthy joints. kerendia presents... the abcs of ckd a is for awareness, because knowing that your chronic kidney disease in type 2 diabetes could progress to dialysis is important. b is for belief that there may be more you can do. just remember that k is for kidneys and kerendia. for adults living with ckd in type 2 diabetes, kerendia is proven to reduce the risk of kidney failure, which can lead to dialysis. kerendia is a once-daily tablet that treats ckd differently than type 2 diabetes medications to help slow the progression of kidney damage and reduce the risk of cardiovascular events, such as heart attacks. do not take kerendia if you have problems with your adrenal glands or take certain medications called cyp3a4 inhibitors. kerendia can cause hyperkalemia, which is high potassium levels in your blood. ask your doctor before taking products containing potassium. kerendia can also cause low blood pressure and low sodium levels. so now that you know your abcs, don't wait. kidney damage from ckd in t2d is not reversible. so ask your doctor about slowing your kidney damage with kerendia. finally, tonight remember to set your clocks forward an hour. love it or hate it, daylight-saving time is back. and here's now surprise to many. the government is still trying to figure out what time it is. cbs' scott macfarlane explains. >> reporter: in the rockies at a 206-acre camp outside of denver they spend a lot of time studying the time. >> that's the on time tick. >> reporter: inside the lab at the national institutes of standards and technology scientist andrew novick and the federal government's time and frequency provision are effecting their nano clock. >> something like your phone, gps. gps works by having atomic clocks onboard satellites sending signals to you and i and everywhere, and that's how your get your location. >> reporter: because no matter how large and sharp they appear clocks aren't perfect, and eventually they slip over time with consequences. >> imagine something like the stock market, right? you have hundreds of millions of transactions happening in a second, so you have to time tag those. who bought it first. >> reporter: there's so much slippage and impermissions in our measure of time, every few years the global community has to ad a leap second to catch up. you just add a second to one day to keep everything aligned. >> yeah. >> reporter: it's mind-boggling. >> it's pretty wild. >> reporter: government is frequently grappling with time. it was the government that created the time zones about 100 years ago to help trains and transit systems keep uniform time and prevent mishaps on the tracks. here in congress they're even debating changing the time. a new proposal would make daylight-saving time permanent and end the twice a year clock changing. >> we like that extra hour. you got to remember we're a rural state. farmers love daylight savings and a lot of other things, too, kids practicing baseball. >> reporter: a similar law nearly passed into law in 2022, so alabama's tommy tuberville is trying again though there's been impact on the especially late morning darkness. you get a lot of calls about this. >> oh, yeah, it's the number one issue. we're going to leave it daylight savings time. >> reporter: many while back at the federal lab in the mountains thir stoil testing and measuring ways to count those nano seconds, trying to perfect all the time in the world. scott macfarlane, cbs news, boulder, colorado. >> and that's all the time we have on this saturday. first thing tomorrow sunday morning with jane paulie and face the nation the guests include bernie sanders and senator marco rubio. i'm mark straussman in washington. good night. from cbs news bay area, this is the evening addition. >> the latest from san jose were firefighters are working to knock out a fire nor a popular mobile. what is on-site is making the fire even more dangerous. and thousands of people lined up around union square today. we will tell you what brought them out so early this morning. >> i woke up at 5:00 in the morning just to come here. it is insane. and a new problem for united airlines following a turbulent couple of days. live from the studio, i am brian hackney. >> and i am andrea nakano. firefighters are getting a handle. >> smoke started filling the skies around 4:00 this afternoon. you can see from that time lapse that the blaze is right in the heart of san jose. you see, the flames are shooting up through the roof of the house. the san jose fire department says there are propane tanks on the property, and they are asking people to still avoid the area. this was just behind the parking garage behind the mall west of 80. and video from san jose fire. they say that nobody