The St. Louis-area machinists union on Sunday voted 51% to 49% against a modified contract proposal after striking for three months against what they said had been “insulting” offers from Boeing.

The vote marked the fourth time the union has struck down company proposals since contract negotiations began this summer. The union rejected the company’s latest offer which included a 1.5% general wage increase and a 2.5% lump sum in year four for top-paid employees.

The offer also included $3,000 of restricted stock units, but cut down on attendance additives. Union representatives said the contract also removes language that allowed managers and non-union workers to perform bargaining unit work.

In a statement, International Association of Machinists and Aerospace Workers Presid

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