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    Airlines Hoping for More Boeing Jets Could Be Waiting Awhile

    The Federal Aviation Administration’s decision to limit Boeing’s production of 737 Max planes could hurt airlines that are struggling to buy enough new aircraft.Boeing hoped 2024 would be the year it would significantly increase production of its popular Max jets. But less than a month into the year, the company is struggling to reassure airline customers that it will still be able to deliver on its promises.That’s because the Federal Aviation Administration said on Wednesday that it would limit the plane maker’s output until it was confident in Boeing’s quality control practices. On Jan. 5, a panel blew off a Boeing 737 Max 9 body shortly after takeoff, terrifying passengers on an Alaska Airlines flight and forcing the pilots to make an emergency landing at Portland International Airport in Oregon. Almost immediately, the F.A.A. grounded some Max 9s.Since then, details have emerged about the jet’s production at Boeing’s facility in Renton, Wash., that have intensified scrutiny of the company’s quality control. Boeing workers opened and then reinstalled the panel about a month before the plane was delivered to Alaska Airlines.The directive is another setback for Boeing, which had been planning to increase production of its Max plane series to more than 500 this year, from about 400 last year. It also planned to add another assembly line at a factory in Everett, Wash., a major Boeing production hub north of Seattle.As part of the F.A.A.’s announcement on Wednesday, it also approved inspection and maintenance procedures for the Max 9. Airlines can return the jets to service once they have followed those instructions. United Airlines said on Thursday that it could resume flying some of those planes as soon as Friday.The move is another potential blow to airlines. Even though demand for flights came roaring back after pandemic lockdowns and travel restrictions eased, the airlines have not been able to take full advantage of that demand. The companies have not been able to buy enough planes or hire enough pilots, flight attendants and other workers they need to operate flights. A surge in the cost of jet fuel after Russia invaded Ukraine also hurt profits.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber?  More

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    Boeing Reinstalled Panel That Later Blew Out of 737 Max Jet

    Employees at its Washington State factory are said to have removed the door plug for further work before the plane was delivered to Alaska Airlines.Nearly three weeks after a hole blew open on a Boeing 737 Max 9 during an Alaska Airlines flight, terrifying passengers, new details about the jet’s production are intensifying scrutiny of Boeing’s quality-control practices.About a month before the Max 9 was delivered to Alaska Airlines in October, workers at Boeing’s factory in Renton, Wash., opened and later reinstalled the panel that would blow off the plane’s body, according to a person familiar with the matter.The employees opened the panel, known as a door plug, because work needed to be done to its rivets — which are often used to join and secure parts on planes — said the person, who asked for anonymity because the person isn’t authorized to speak publicly while the National Transportation Safety Board conducts an investigation.The request to open the plug came from employees of Spirit AeroSystems, a supplier that makes the body for the 737 Max in Wichita, Kan. After Boeing employees complied, Spirit employees who are based at Boeing’s Renton factory repaired the rivets. Boeing employees then reinstalled the door.An internal system that tracks maintenance work at the facility, which assembles 737s, shows the request for maintenance but does not contain information about whether the door plug was inspected after it was replaced, the person said.The details could begin to answer a crucial question about why the door plug detached from Flight 1282 at 16,000 feet, forcing the pilots to make an emergency landing at Portland International Airport in Oregon minutes after taking off on Jan. 5. The door plug is placed where an emergency exit door would be if a jet had more seats. To stay in place, the plug relies primarily on a pair of bolts at the top and another pair at the bottom, as well as metal pins and pads on the sides.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber?  More

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    Delta Air Lines Boeing 757 Lost Nose Wheel Before Takeoff, F.A.A. Says

    The Federal Aviation Administration is investigating the latest troubling event involving a Boeing aircraft.A Boeing 757 plane operated by Delta Air Lines lost a nose wheel as it prepared to take off from Atlanta’s main airport on Saturday, according to the Federal Aviation Administration. It was the latest troubling episode involving one of the manufacturer’s aircraft.Delta Air Lines Flight 982 was preparing to take off from Hartsfield-Jackson Atlanta International Airport for a trip to Bogotá, Colombia, at about 11:15 a.m. Saturday when a “nose wheel came off and rolled down the hill,” the agency said in a preliminary report.More than 170 passengers who were aboard had to deplane, but no one was hurt, the report said.A Delta spokesman said the passengers were put on a replacement flight.A Boeing spokesman declined to comment and directed questions to Delta.The F.A.A. said that it was continuing its investigation.It’s been a turbulent period for Boeing, which has been fraught in recent years with safety concerns after deadly catastrophes. The manufacturer faces renewed scrutiny after a door plug blew off a new Alaska Airlines Boeing 737 MAX 9 plane at 16,000 feet on Jan. 5 just after it took off from the Portland International Airport in Oregon.No one was seriously injured then, but passengers were exposed to whipping winds on the plane’s harrowing return to Portland.The F.A.A. then ordered about 170 Boeing 737 Max 9 planes to be grounded in the United States until they could be inspected. The plane that lost a wheel in Atlanta on Saturday, a Boeing 757, is a different model. More

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    Matt Damon, Fran Drescher and an Indian Soybean Farmer on 2024

    What are your hopes for 2024? See how they compare with those of 11 people I put that question to. (Most of them replied by email. The people from Afghanistan and India spoke by phone.)Fran Drescher, an actress and the president of SAG-AFTRA, which staged a 118-day strike against movie and television producers this year:In 2024, I am looking forward to a sudden and essential collective human emotional growth spurt, whereby empathy becomes the main emotion that informs all behavior.Andrew Marsh, the chief executive of Plug Power, a fuel cell supplier:My hope is to see 2024 as the year we get serious about decarbonizing hard-to-abate heavy industrial manufacturing sectors. Building out a nascent U.S. hydrogen industry is essential to moving these industrial processes to carbon neutrality.Uri Levine, an entrepreneur and a co-founder of Waze:I want people to find a purpose in life. When you have a life purpose or figure out what your destiny is, your life becomes simpler, everything is clearer, and you’re happier, healthier and richer. You know what you have to do. The purpose becomes the north star to guide you. My purpose is to create value.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber?  More

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    Why U.A.W. President Shawn Fain Has Taken a Hard Line

    Shawn Fain owes his rise within the United Automobile Workers to a group determined to make the union far more confrontational toward automakers.When Shawn Fain sought the presidency of the United Automobile Workers union last year, he ran on a platform that promised: “No corruption. No concessions. No tiers.”That pledge encapsulated many members’ frustrations with years of union scandal and concessions to the three big Detroit automakers, including the creation of a lower tier of wages for newer employees. The platform helped propel Mr. Fain to the top job — where he has led a mounting wave of walkouts in recent weeks to demand more favorable contract terms.But the platform largely predated Mr. Fain’s candidacy. It was devised by a group called Unite All Workers for Democracy, which was officially formed in 2020 as a caucus — essentially, a political party within the union.The group set out to topple the ruling party, known as the Administration Caucus, which had run the union for more than 70 years. In 2022, Unite All Workers hashed out its party line, recruited candidates and ramped up a campaign operation to elect them.When the dust settled, the slate had won half the seats on the union’s 14-member executive board, with Mr. Fain, previously a union staff member, as president. Unite All Workers’ role helps explain why the union has taken such a hard line with the automakers.“We had a platform we ran on, and we’re trying to push that platform forward,” said Scott Houldieson, a founder of the group and a longtime Ford Motor worker in Chicago. “Shawn has been really upfront about what we’re trying to accomplish.”The first fruits of that approach may have emerged Wednesday, when negotiators for the union and Ford agreed on terms for a new four-year contract, including a wage increase of roughly 25 percent over the four years, according to the union.“We hit the companies to maximum effect,” Mr. Fain said in a Facebook livestream. The deal is subject to ratification by the company’s union workers.Since at least the 1980s, U.A.W. members have formed groups to challenge the union’s top officials, or at least prod them to be more confrontational with automakers. The efforts took on added urgency in 2007, when the union accepted tiers as a way to stabilize the automakers’ financial footing. (General Motors and Chrysler later filed for bankruptcy anyway; Ford avoided it.)Scott Houldieson, a founder of United Auto Workers for Democracy, said, “We had a platform we ran on, and we’re trying to push that platform forward.”Jamie Kelter Davis for The New York TimesBut the Administration Caucus always held a trump card: The union leadership wasn’t elected directly by members. Rather, future leaders were effectively chosen by existing leaders, then approved by delegates to a convention every four years.That changed after a corruption scandal in which two recent U.A.W. presidents were charged with embezzlement in 2020. As part of a consent decree with the federal government, members voted in a referendum on whether to directly elect union leaders. Unite All Workers, which was pressing for the change, waged an all-out campaign to persuade union members to support “one member one vote.”When the initiative passed by nearly a two-to-one ratio, Unite All Workers, whose members paid an annual fee, was poised to become a kingmaker of sorts in the union’s 2022 elections. The group had a budget of over $100,000, two full-time staff members and hundreds of volunteer organizers.“It was obvious that we could use the same infrastructure” of staff and volunteers to compete in the election, said Mike Cannon, a retired U.A.W. member who serves on the Unite All Workers steering committee. “The only question at that point was, were we going to have any candidates?”Unite All Workers announced that anyone who wanted to join its campaign slate would have to fill out a detailed questionnaire and attend at least one meeting with its members.The group wanted to ensure that the candidates it backed were committed to running the union with extensive input from rank-and-file members, and to driving a much harder bargain with employers. It wanted an end to wage tiers, which it said divided and demoralized workers, and a focus on organizing new members, especially among electric vehicle and battery workers.Among those responding to the call was Mr. Fain, then a staff member in the union division responsible for Stellantis, the parent of Chrysler, Jeep and Ram. During his interview process, Mr. Fain explained how, as a local official in Indiana in 2007, he had helped lead opposition to the two-tier wage structure the union had agreed to, and how he had argued for more favorable contract terms after joining the headquarters staff.Some members of the group were skeptical that an employee of the old guard could be a reformer. But other U.A.W. dissidents vouched for him. “I knew the claims were legit,” said Martha Grevatt, a longtime Chrysler employee on the steering committee of Unite All Workers.Martha Grevatt said she had found Mr. Fain’s pledges to shake up the union “legit” even though he had been a staff member under the previous leadership.Daniel Lozada for The New York TimesThe group backed Mr. Fain and six other candidates for the union’s 14-member executive board, and all seven won.As president, Mr. Fain has appointed critics of the former leadership as his top aides, including one who served on the Unite All Workers steering committee. Board members, including Mr. Fain, have attended some of the group’s monthly membership meetings and taken part in one of its WhatsApp chats.Many of the group’s priorities became demands in the union’s contract negotiations, and Mr. Fain has indicated that he hopes to use momentum from the strike to organize nonunion companies like Tesla and Honda, a key objective of Unite All Workers.But for all the connections between the group and the union leadership, they are not one and the same.Some board members who ran on the Unite All Workers slate have at times taken positions in tension with the group’s priorities. In recent weeks, Margaret Mock, the union’s second-ranking official, has expressed concern to fellow board members about the walkout’s cost to the union’s budget. At a special board meeting last week, she offered a proposal intended to scale back spending on organizing during the strike, according to two people familiar with the meeting. The board set aside the proposal; Ms. Mock did not respond to a request for comment.For its part, Unite All Workers considers itself accountable to rank-and-file members, not an extension of the leaders it helped elect. On a tentative deal with any of the three large automakers, Unite All Workers plans to appoint a task force to provide an assessment of the proposal to the union’s members. The group’s members will then decide whether to support it.“I would say it’s not automatic that the caucus endorses” an agreement, said Andrew Bergman, who serves on the Unite All Workers steering committee.Still, as a practical matter, the group is highly unlikely to oppose an agreement, since Mr. Fain has forcefully pressed for its core priorities.“For years, we’ve been playing defense at every step, and we’ve been losing,” Mr. Fain said in a video streamed online on Friday, explaining why the strike would continue. “When we vote on a tentative agreement, it will be because your leadership and your council thinks we’ve gotten absolutely every dollar we can.” This week, the union expanded the strike to the largest U.S. factories at Stellantis and General Motors.The approach has raised concerns among employers and business groups. John Drake, a vice president at the U.S. Chamber of Commerce, said that the Detroit automakers could struggle to remain competitive after the strike, and that Mr. Fain appeared to be overreaching in extracting concessions.“It feels like there’s not really a strategy here,” Mr. Drake said. “It’s like pain is the goal.”Mr. Fain has indicated that he hopes to use momentum from the strike to organize nonunion companies like Tesla and Honda, a key objective of the insurgent group that endorsed his candidacy.Jamie Kelter Davis for The New York TimesThe best analogy for Unite All Workers may be to a group called Brand New Congress, created by supporters of Senator Bernie Sanders, the progressive Vermont independent, to help elect congressional candidates beginning in 2018.Not long after the 2016 presidential election, Brand New Congress urged an obscure New York bartender and activist named Alexandria Ocasio-Cortez to challenge a longtime incumbent in a Democratic congressional primary. A sister group provided her with training and campaign infrastructure. After she won, two people involved with the groups joined her staff.Ms. Ocasio-Cortez has since become far more prominent than those early backers, and in principle she could take positions at odds with their progressive stands. But in practice, it’s unlikely. The worldview is embedded in her political identity.Mr. Fain’s story is similar: a once-obscure progressive who was catapulted to a position of power by a group of insurgents and was determined to enact their shared principles once he got there. Except that, in backing him and his colleagues, Unite All Workers helped win not just a few legislative seats, but the reins of an entire union.After Vail Kohnert-Yount, a Unite All Workers steering committee member, seconded Mr. Fain’s nomination for president at the union’s convention last year, he spoke to her about relying on government assistance as a new parent decades ago.“I remember thinking this guy has not forgotten where he came from — he’s very much stayed that person,” Ms. Kohnert-Yount said. “We did our best to endorse a candidate we believed in.” More

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    U.A.W. Will Not Expand Strikes at G.M., Ford and Stellantis as Talks Progress

    The United Automobile Workers reported improved wage offers from the automakers and a concession from General Motors on workers at battery factories.The United Automobile Workers union said on Friday that it had made progress in its negotiations with Ford Motor, General Motors and Stellantis, the parent of Chrysler, and would not expand the strikes against the companies that began three weeks ago.In an online video, the president of the union, Shawn Fain, said all three companies had significantly improved their offers to the union, including providing bigger raises and offering cost-of-living increases. In what he described as a major breakthrough, Mr. Fain said G.M. was now willing to include workers at its battery factories in the company’s national contract with the U.A.W.G.M. had previously said that it could not include those workers because they are employed by joint ventures between G.M. and battery suppliers.“Here’s the bottom line: We are winning,” said Mr. Fain, wearing a T-shirt that read, “Eat the Rich.” “We are making progress, and we are headed in the right direction.”Mr. Fain said G.M. made the concession on battery plant workers after the union had threatened to strike the company’s factory in Arlington, Texas, where it makes some of its most profitable full-size sport-utility vehicles, including the Cadillac Escalade and the Chevrolet Tahoe. The plant employs 5,300 workers.G.M. has started production at one battery plant in Ohio, and has others under construction in Tennessee and Michigan. Workers at the Ohio plant voted overwhelmingly to be represented by the U.A.W. and have been negotiating a separate contract with the joint venture, Ultium Cells, that G.M. owns with L.G. Energy Solution.Ford is building two joint-venture battery plants in Kentucky and one in Tennessee, and a fourth in Michigan that is wholly owned by Ford. Stellantis has just started building a battery plant in Indiana and is looking for a site for a second.G.M. declined to comment about battery plant workers. “Negotiations remain ongoing, and we will continue to work towards finding solutions to address outstanding issues,” the company said in a statement. “Our goal remains to reach an agreement that rewards our employees and allows G.M. to be successful into the future”Shares of the three companies jumped after Mr. Fain spoke. G.M.’s stock closed up about 2 percent, Stellantis about 3 percent and Ford about 1 percent.The strike began Sept. 15 when workers walked out of three plants in Michigan, Ohio and Missouri, each owned by one of the three companies.The stoppage was later expanded to 38 spare-parts distribution centers owned by G.M. and Stellantis, and then to a Ford plant in Chicago and another G.M. factory in Lansing, Mich. About 25,000 of the 150,000 U.A.W. members employed by the three Michigan automakers were on strike as of Friday morning.“I think this strategy of targeted strikes is working,” said Peter Berg, a professor of employment relations at Michigan State University. “It has the effect of slowly ratcheting up the cost to the companies, and they don’t know necessarily where he’s going to strike next.”Here Are the Locations Where U.A.W. Strikes Are HappeningSee where U.A.W. members are on strike at plants and distribution centers owned by Ford, General Motors and Stellantis.The contract battle has become a national political issue. President Biden visited a picket line near Detroit last month. A day later, former President Donald J. Trump spoke at a nonunion factory north of Detroit and criticized Mr. Biden and leaders of the U.A.W. Other lawmakers and candidates have voiced support for the U.A.W. or criticized the strikes.When negotiations began in July, Mr. Fain initially demanded a 40 percent increase in wages, noting that workers’ pay has not kept up with inflation over the last 15 years and that the chief executives of the three companies have seen pay increases of roughly that magnitude.The automakers, which have made near-record profits over the last 10 years, have all offered increases of slightly more than 20 percent over four years. Company executives have said anything more would threaten their ability to compete with nonunion companies like Tesla and invest in new electric vehicle models and battery factories.The union also wants to end a wage system in which newly hired workers earn just over half the top U.A.W. wage, $32 an hour now, and need to work for eight years to reach the maximum. It is also seeking cost-of-living adjustments if inflation flares, pensions for a greater number of workers, company-paid retirement health care, shorter working hours and the right to strike in response to plant closings.In separate statements, Ford and Stellantis have said they agreed to provide cost-of-living increases, shorten the time it takes for employees to reach the top wage, and several other measures the union has sought.Ford also said it was “open to the possibility of working with the U.A.W. on future battery plants in the U.S.” Its battery plants are still under construction and have not hired any production workers yet.The union is concerned that some of its members will lose their jobs, especially people who work at engine and transmission plants, as the automakers produce more electric cars and trucks. Those vehicles do not need those parts, relying instead on electric motors and batteries.Stellantis’ chief operating officer for North America, Mark Stewart, said the company and the union were “making progress, but there are gaps that still need to be closed.”The union is also pushing the companies to convert temporary workers who now make a top wage of $20 an hour into full-time staff.Striking at only select locations at all three companies is a change from the past, when the U.A.W. typically called for a strike at all locations of one company that the union had chosen as its target. Striking at only a few locations hurts the companies — the idled plants make some of their most profitable models — but limits the economic damage to the broader economies in the affected states.It also could help preserve the union’s $825 million strike fund, from which striking workers are paid while they’re off the job. The union is paying striking workers $500 a week.G.M. said this week that the first two weeks of the strike had cost it $200 million. The three automakers and some of their suppliers have said that they have had to lay off hundreds of workers because the strikes have disrupted the supply and demand for certain parts.Santul Nerkar More

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    Ramaswamy Aims to Capture Voters Opposed to a Chinese Company in Michigan Visit

    Vivek Ramaswamy will make a swing through Michigan on Tuesday as he seeks to capture voters in a swing state seen as a battleground for blue-collar workers.Both President Biden and former President Donald J. Trump visited the state just days apart last week — Mr. Biden joined the picket line with striking members of the United Automobile Workers, while Mr. Trump spoke at a nonunion factory.Mr. Ramaswamy’s return to the Great Lakes State on Tuesday will close with a rally opposing plans for an electric vehicle battery factory that has become a flashpoint in the state, heightening U.S.-China-related tensions.Gotion, a Chinese subsidiary, has sought to a build $2.4 billion electric vehicle battery factory spanning 270 acres in Green Charter Township, a rural Michigan town. Despite the factory’s potential to bolster the local economy, “No Gotion” signs have popped up as residents fear an infiltration by the Chinese Communist Party — though the company insists it has no ideological ties to China or affiliations with political parties.Several Republican presidential candidates, including Mr. Ramaswamy, an entrepreneur, have argued against allowing Chinese companies to purchase American land. Criticism of electric vehicle production has also become standard in the race.Wednesday will be Mr. Ramaswamy’s second visit to the state in as many weeks. He attended the Mackinac Republican Leadership Conference in September.His first stop Wednesday will be a breakfast rally in Saginaw, followed by a town hall in Flint. The rally “opposing China’s Gotion electric battery plant” will be in Big Rapids.Other G.O.P. candidates have focused more of their energy on Iowa, New Hampshire and South Carolina, states with primaries that will be held before Michigan’s.Gov. Ron DeSantis of Florida will campaign in South Carolina on Wednesday for the first time in months, after his last scheduled trip there in August was derailed by Hurricane Idalia.And Senator Tim Scott of South Carolina will be in Van Cleve, Iowa, hosting a town hall as he tries to ramp up support while his poll numbers dwindle. More

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    In Michigan, Biden and Trump Offer a Preview of 2024

    The candidates’ dueling styles were on clear display as the two men tried to woo voters affected by the United Automobile Workers strike.It’s going to be a long road to next November. And the first steps started this week.President Biden and former President Donald J. Trump traveled to Michigan, one day after the other, to speak directly to working-class voters in what amounted to a preview of a likely 2024 campaign.Their dueling styles were on clear display as the two men tried to woo voters affected by the United Automobile Workers strike. Mr. Biden has campaigned on a message of bolstering the middle class, protecting democratic norms and countering China. Mr. Trump, a criminal defendant several times over, has focused on vindicating himself, channeling conservative grievances and promoting America-first policies.Their differences are not just ideological and tactical but stylistic. Mr. Trump prefers a boisterous event that lets him take center stage, and Mr. Biden, so far, has opted for small fund-raisers where he can burnish his Scranton Joe persona.Voters have signaled that they would prefer a different set of options in 2024, but for now, the most likely choice is between the current and former president, who have sharply diverging visions for the future of the United States.In a speech on Wednesday, former President Donald J. Trump criticized the Biden administration’s clean-energy agenda.Doug Mills/The New York TimesRaucous rallies, like the one he held on Wednesday, allow Mr. Trump to test his messaging and give him political oxygen to power through the next news cycle. On Wednesday, as seven other Republican presidential candidates gathered in California for a primary debate, Mr. Trump bragged about being ahead of the field — at one point calling his rivals “job candidates” for a second Trump administration — and brought his usual bluster to a crowd of several hundred at a nonunion manufacturing facility.Guests circulated inside the facility, called Drake Enterprises, some wearing T-shirts emblazoned with Mr. Trump’s mug shot and a telling caption: “NEVER SURRENDER.”In an hourlong speech, Mr. Trump castigated the Biden administration’s clean-energy agenda, which includes a push for a transition to electric vehicles that has aggravated union workers who share his populist views on the economy.“A vote for Crooked Joe means the future of the auto industry will be based in China,” Mr. Trump told the crowd, warning that a transition to electric vehicles amounted to a “transition to hell.” He offered tepid support for the striking autoworkers, telling them that electric vehicles would undermine any success with a new contract: “It doesn’t make a damn bit of difference what you get because in two years you’re all going to be out of business.”Mr. Trump repeatedly overinflated the evening’s crowd size, at one point falsely claiming that there were 9,000 people waiting outside the venue. But in Michigan, he did what Mr. Biden has not done yet: He pleaded for endorsements and votes.“Your leadership should endorse me,” Mr. Trump said, “and I will not say a bad thing about them again and they will have done their job.”Mr. Trump spoke to a crowd of several hundred on Wednesday.Doug Mills/The New York TimesNever a big fan of a rally, Mr. Biden, who has for decades presented himself as a champion of the middle class, has so far limited most of his campaign appearances to fund-raisers or receptions with supporters. At those events, he opts to shake hands in rope lines and share stories of his decades in politics. He also warns his supporters of the grave risk he feels Mr. Trump continues to pose to the country.On Tuesday, before traveling to California for campaign events and a meeting with technology advisers, Mr. Biden became the first sitting president to join a picket line, visiting workers outside a General Motors facility in Belleville, Mich. — a sign of how important it was for him to court a powerful political bloc whose ranks are no longer full of reliably Democratic voters.“The middle class built this country,” Mr. Biden told striking workers on Tuesday. “And unions built the middle class. That’s a fact.”President Biden showed support for striking autoworkers by joining their picket line outside a General Motors facility west of Detroit.Pete Marovich for The New York TimesIn his short appearance with workers — Mr. Trump and several of supporters pointed out that the visit was only about 12 minutes — Mr. Biden spoke briefly and turned a bullhorn over to Shawn Fain, the U.A.W. president.Unlike Mr. Trump, the president did not take the chance to link his visit to Michigan to securing union backing. When asked if he hoped to receive the support of the U.A.W., which endorsed him in 2020 but has refrained so far out of complaints about his clean-energy agenda, Mr. Biden would only say, “I’m not worried about that.”Before Mr. Trump’s visit on Wednesday, the Biden campaign released an ad targeting the former president’s economic track record, accusing Mr. Trump of passing “tax breaks for his rich friends while automakers shuttered their plants and Michigan lost manufacturing jobs.”Age and energy have become prevailing concerns among voters about Mr. Biden, who spent this week crisscrossing the country. On Thursday, Mr. Biden, who is 80, is scheduled to deliver what is widely seen as a rebuttal to Mr. Trump’s appearance and the Republican primary debate.Mr. Trump, who is 77, relied on a teleprompter on Wednesday evening — as does Mr. Biden when he delivers prepared remarks. He could not resist the occasional aside, including an extended complaint about the paint job on Air Force One — “so inelegant,” said Mr. Trump, who tried to change the exterior of the plane when he was president. When he departed, he took his time navigating a set of stairs that led to the stage.President Biden became the first sitting president to join a picket line on Tuesday.Pete Marovich for The New York TimesIn recent appearances, Mr. Biden has spoken comparatively softly, and has tried to make light of concerns about his age. “I’ve never been more optimistic about our country’s future in the 800 years I’ve served,” he said at a campaign event this month.But at a reception in California on Wednesday, Mr. Biden had sharp words for his predecessor.“We’re running because our most important freedoms — the right to choose, the right to vote, the right to be who you are, to love who you love — has been attacked and shredded,” the president told supporters. “Donald Trump and the MAGA Republicans are determined to destroy American democracy because they want to break down institutional structures.” More