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Air Wisconsin Airlines Corp. will close its facility at Mitchell International Airport, terminating the jobs of 53 workers there, according to a notice from the company.

The closure and terminations are the result of Air Wisconsin losing its contract with United Airlines, according to a letter to the Wisconsin Department of Workforce Development Dislocated Worker Unit.

The permanent layoffs will affect 50 passenger agents represented by the International Association of Machinists and Aerospace Workers, according to the letter.

They will also affect three salaried workers — a manager, an administrative assistant and a shift supervisor — and the final day of work for the employees will be August 16, according to the letter.