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Spirit AeroSystems announced Friday layoffs of about 2,800 employees at its Wichita, Kansas, facility, adding that smaller workforce reductions are planned later this month at plants in Tulsa and McAlester.

Spirit is taking the move because of the suspension of Boeing 737 Max production and ongoing uncertainty on the pace of production when it does resume.

The company employs about 1,300 people in Tulsa and roughly 300 in McAlester.

Spirit is a significant supplier on the 737 Max program, with its workshare accounting for 70% of the airplane’s structure. This includes the entire fuselage, thrust reversers, engine pylons and wing components. In addition, the Max represents more than 50% of Spirit’s annual revenue.

Before the layoffs, Spirit employed about 13,000 people in Wichita, making it the city’s largest employer.

Spirit has not received notice from Boeing on how long the production suspension will last or what the production rate will be in the future. Spirit believes that, when production resumes, the levels will be lower than previously expected due, in part, to the customer’s need to consume more than 100 Max shipsets currently in storage at Spirit’s facilities.