Boeing Co. offered a 30% pay bump directly to striking workers, bypassing furious union leaders as it tries to overcome a debilitating strike that has shut down its aircraft manufacturing across the Pacific Northwest.

More than 30,000 Boeing machinists began a strike on Sept. 13 after overwhelmingly turning down a tentative agreement. The financial impact of Boeing's strike will depend on how long it lasts, but Bank of America estimates it's costing Boeing $50 million a day.

Amid a union strike over a pay dispute, Boeing has made what it describes as its "best and final offer" to roughly 33,000 striking union machinists, intensifying efforts to end the strike, which has entered its second week.

Boeing announced Monday that it had made a “best and final offer” to striking union machinists, proposing larger raises and bonuses in an effort to end a strike that began on September 13. The revised offer includes a 30% pay raise over four years, an increase from the 25% raise in the previously rejected proposal.

Boeing said Monday it made a “best and final offer” to striking union machinists that includes bigger raises and larger bonuses than a proposed contract that was overwhelmingly rejected.

The company said it was making a “best and final” offer, which also includes better retirement benefits than a deal that 33,000 union members rejected earlier this month. The manufacturer has said the offer is only good if union members vote in favour by Friday.

Boeing made a "best and final" pay offer to thousands of striking workers on Monday, but its largest union declined to put it to a vote, saying the planemaker had refused to bargain over the proposal that fell short of members' demands.

The union representing thousands of striking Boeing workers has hit out at what the aircraft manufacturing giant called its "best and final" pay offer, which proposed a 30% rise over four years. The new offer also included the reinstatement of a performance bonus and improved retirement benefits.

Boeing on Monday made a new offer to its striking machinists union in hopes of ending a walkout that is costing the cash-strapped jet maker hundreds of millions of dollars a week. The proposal comes 11 days after Boeing’s biggest union rejected a tentative contract and overwhelmingly voted to go on strike.