The Boeing Co. expects the Machinists strike that has shut down its plane factories to last for at least a month and further push back the 787 Dreamliner, Chief Financial Officer James Bell said.

"I think there'll be at least a one-month delay," Bell said Wednesday at a Morgan Stanley conference webcast from Dana Point, Calif.

"Right now it's a one-for-one day slip on the 787 and all other programs as well."

The company's 27,000 Machinists walked off the job Sept. 6, demanding more job security and higher compensation.

The strike jeopardizes Boeing's plan to test-fly the Dreamliner in November and to start shipments in next year's third quarter. The 787 program is already at least 14 months behind schedule because of parts shortages and problems with suppliers.

"We'll never get to a complete impasse," Bell said, while noting there are "still significant issues" between Boeing and the International Association of Machinists and Aerospace Workers. The dispute over the use of outside contractors to perform work that Machinists have traditionally done "is not the only issue we're apart on."

Boeing offered the employees who make parts and assemble planes a package Aug. 28 that included an 11 percent raise over three years, bonuses and a 14 percent gain in pension payments. The proposal fell short of the 13 percent raise the IAM sought and didn't address its request to limit the outsourcing of work. Boeing also asked that workers pay higher medical co-pays and deductibles.