The proposal includes raises of 30 percent over the four-year contract, up from a 25 percent offer, but it’s unclear whether it will satisfy workers.

Boeing Co. sweetened a contract offer for about 33,000 workers at its main Seattle manufacturing hub, seeking to overcome a strike that’s been going on for more than a week and threatens to deepen the planemaker’s financial crisis.

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.

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 increased its wage proposal to tens of thousands of striking workers on Monday, offering a 30% general wage increase over four years in what it called its "best and final" offer as a work stoppage that began on Sept.

Boeing Co. offered its largest union a larger pay bump as it tries to overcome a debilitating strike that has shut down its aircraft manufacturing across the Pacific Northwest.

Boeing said Monday it has raised its offer to the International Association of Machinists union to end the strike by 33,000 union members that has now entered its 11th day.