(Reuters) – Some 31,000 Boeing machinists vote on Friday on a crucial labor contract that affects the location of thousands of jobs and billions of dollars of economic activity.

If the workers accept the deal, Boeing Co (BA.N) would build its new 777X jetliner and wings in the Seattle area, where Boeing has built aircraft for more than 90 years.

If they reject it, Boeing says it will make the wings and possibly the whole plane, elsewhere, marking a major employment and economic loss for Washington state.

Boeing says it has received offers from 22 states interested in hosting a new factory to build the successor to its popular 777 widebody jet.

The vote has opened deep rifts between the local International Association of Machinists and Aerospace Workers (IAM), which opposes the contract, and its Washington leadership, which forced a vote on the proposal. It has also revealed cleavages between younger workers open to the deal and older workers dead set against it.

In November, two-thirds of machinists voted against a similar offer that would have replaced their traditional defined-benefit pension with a 401(k)-style savings plan, one of two retirement plans the workers receive.

The union’s national leadership negotiated that deal, which would have extended the contract eight years beyond its current expiration in 2016. But local leaders opposed it, saying the take-aways were too great.

Now, the same dynamic is playing out again. Boeing has sweetened the offer with a larger signing bonus and other changes. But the deal still eliminates the pension, and local union leaders have urged members to reject it.

“You need to look at the facts of the economic destruction you would live under for the next 11 years,” local leaders said in a letter to members.

The national leaders say the new offer is $1 billion better than the prior one.

“The membership deserves the final say,” said R. Thomas Buffenbarger, president of the IAM International, which also has members in Canada.

The issue has drawn wide attention as other states bid to win thousands of well-paid jobs and because of the tactics Boeing has used to bargain with its union.

Even noted consumer advocate Ralph Nader has weighed in, calling Boeing’s tough stance “unseemly,” given Chief Executive Jim McNerney’s $21 million pay package.

“A book could be written about the Boeing company’s strategy for externalization of a variety of its costs onto innocent, defenseless people – whether workers or taxpayers,” Nader wrote.

SOURCE REUTERS, Read More..