THE union at the centre of strike action at Boeing told the employer today that its “best and final offer” wasn’t good enough to end the dispute.

The leaders of the International Association of Machinists and Aerospace Workers (IAMAW) district 751 said there will not be an acceptance vote before Boeing's Friday deadline.

The union also complained that the offer, which includes bigger raises and larger bonuses, was publicised to the 33,000 striking workers without first bargaining with union negotiators.

The union told members on Monday night: “Boeing does not get to decide when or if you vote.

“The company has refused to meet for further discussion; therefore, we will not be voting.”

Boeing said that two days of talks with federal mediators failed to produce an agreement.

Boeing said: “We presented a best and final offer that made significant improvements and addressed feedback from the union and our employees.”

The company said the new offer is more generous than the one that was overwhelmingly rejected earlier this month.

Boeing added the offer includes pay raises of 30 per cent over four years, up from 25 per cent in the first proposal. 

The union originally demanded 40 per cent over three years.

The IAMAW, representing factory workers who assemble some of the company’s best-selling planes, told members: “This proposal does not go far enough to address your concerns.”

Boeing’s latest offer includes up-front pay raises of 12 per cent plus three annual raises of 6 per cent each.

The company said average annual pay would rise from the equivalent of around £57,000 now to £84,000 at the end of the four-year contract.

The new offer would not restore a traditional pension plan that Boeing eliminated about a decade ago. Striking workers said pay and pensions were key reasons for their 94.6 per cent vote against the company's previous offer.