Brad Lee, 47, places signs against his car in the parking lot of the Machinists Union Hall in Seattle. The International Association of Machinists and Aerospace Workers planned to begin a strike early this morning after contract talks failed late Friday.

Seattle ? Despite a 48-hour contract extension, negotiations between Boeing Co. and Machinists union officials failed Friday and the union said a strike was set to begin at 2:01 a.m. CDT today.

When the talks broke off, the union sent out a message to members saying: “The strike is on!”

The company said it would not try to assemble planes during the strike.

Boeing spokesman Tim Healy said the company is open to further discussion, but both sides were too far apart to reach agreement. He added no additional talks were scheduled.

The Machinists bargain for about 25,000 aircraft assembly workers in the Puget Sound area, about 1,000 in Oregon and 750 at Boeing’s defense operation in Wichita, Kan.

Union members on Wednesday voted 80 percent to reject Boeing’s final three-year contract offer and 87 percent to go on strike, mainly over job security. Both sides agreed to the extension at the request of Gov. Chris Gregoire and federal mediators.

Negotiators for Boeing and the machinists jetted off to a Disney resort in Florida for talks following the extension, in part so Tom Buffenbarger, International Association of Machinists international president, could participate. Buffenbarger was at the resort for an IAM convention.

Tom Wroblewski, president of Machinists District Lodge 751, declared in a statement that Boeing had “disrespected the finest aerospace workers anywhere on the planet” by failing to meet machinists’ expectations.

“Despite meeting late into the night and throughout the day, continued contract talks with the Boeing Company did not address our issues,” he added.

“Over the past two days, Boeing, the union and the federal mediator worked hard in pursuing good-faith explorations of options that could lead to an agreement,” Scott Carson, president and CEO of Boeing Commercial Airplanes, said in a statement. “Unfortunately the differences were too great to close.”

Boeing operations in Washington, Oregon and Kansas will remain open, Carson said. Employees such as engineers, who are not represented by the Machinists, are expected to report for work as usual, he added.

During the strike, Carson said the company does not intend to assemble airplanes, but would deliver completed planes and supply customers with spare parts.