OMAHA, Neb. (AP) — Several hundred workers at a Kellogg’s plant that makes Cheez-Its won a new contract that delivers more than 15% wage increases over three years after 1,400 workers at the company’s cereal plants went on strike for nearly three months last fall.

The wage and benefits improvements that 570 workers at the Kellogg’s plant in Kansas City, Kansas, secured this week are the largest that have been seen in that location by the Retail, Wholesale and Department Store Union, it said Wednesday.

U.S. companies are struggling to fill the more than 11 million job openings across the country that represent nearly two openings for everyone unemployed, and workers are demanding more after keeping plants operating throughout the pandemic.

Job openings hovered at a near-record high for the second consecutive month in February, the Labor Department reported this week.

“This contract is further evidence of the power of a union voice and collective bargaining,” said the union’s president Stuart Appelbaum.

Officials at Kellogg’s, which is based in Battle Creek, Michigan, said they treat each negotiation differently based on the needs of the businesses and the local market.

“We’re glad to have negotiated a contract that recognizes the important work of our employees in Kansas City and helps ensure the long-term viability of the bakery and our business,” spokeswoman Kris Bahner said.

Besides the strike at Kellogg’s plants in Nebraska, Michigan, Pennsylvania and Tennessee last fall, workers also walked out last year at a Frito-Lay plant in Topeka, Kansas, and at five Nabisco plants nationwide. And meatpacking workers have been winning significant raises when their contracts come up at plants across the country.

Unions in other industries, including one that represents more than 10,000 John Deere workers, also went on strike last year. The Deere workers received 10% raises and improved benefits after going on strike for month.

Workers have also voted to unionize at more than a half dozen Starbucks stores across the country and unions are trying to organize at roughly 140 other stores nationwide. And Amazon is trying to stave off unions at two of its warehouses in New York and Alabama where ballots are in the process of being counted now.

Experts say the ongoing labor shortages and the actions unions have taken have given unions more leverage than they have had in decades during contract talks.

“The recent upsurge in strike activity has reminded employers that the threat of a strike is a realistic possibility, and workers in general can gain leverage from that,” Fordham University sociologist Chris Rhomberg said.

Rutgers University professor Todd Vachon, who teaches classes about labor relations, said it’s clear that Kellogg’s and other companies are taking a different approach to negotiations in light of the shift in the labor landscape. Even some union leaders are being surprised by workers’ willingness to fight for better wages and benefits, he said.

“With many would-be workers refusing to accept low-wage jobs and existing employees prepared to take collective action to increase wages, the decision-making metric is much different for employers than it was just a couple of years ago,” Vachon said. “Add to that the generally high level of public support for unions and strikes in recent months, and employers are really feeling the pressure to do right by their employees, especially if they are taking in high and even record levels of profit.”

A spokeswoman for the Bakery, Confectionery, Tobacco Workers and Grain Millers International Union that represents the Kellogg’s cereal plant workers said that strike and the others across the industry in the past year have helped it secure significant gains for workers at other companies.

The Cheez-It workers will receive 6% raises in the first year of their new contract, 5% raises the following year and 4.5% raises and a $500 bonus in the third year. The workers will also see improved health and pension benefits with no increase in their health insurance premiums. And new hires will move up to higher pay rates more quickly.

“These wage increases will help us better provide for our families and improve the quality of our lives,” said Larry Smith, who leads the local union at the Kellogg’s plant.

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