Workers were watching as strikers won concessions from Hollywood studios and Detroit automakers.
The UAW fought for protection if factories shut down. But workers in other carbon-intensive industries could find themselves displaced.
The deal follows the pattern set with Ford last week and Jeep maker Stellantis over the weekend.
Investors — and the union — will be scrutinizing the numbers for clues about how the extended work stoppage is affecting the companies.
The union is making a bet that inconvenienced drivers will side with them – which would put pressure on the Big Three car companies to make a deal.
A four-day workweek, which is among UAW contract demands, could make companies more efficient. But some think it could cause burnout.
The practice dates back to the federal bailout in the 2000s.
Solid Inventory is keeping some worries away for now. But a prolonged strike could hurt the industry, one expert says.
So far, the UAW is holding a limited strike at three plants across three states.
The United Auto Workers may focus its actions on specific plants, instead of organizing a broad work stoppage, if contract negotiations fail.