"We have to do what we can to get the contract."
Aaron Powell, a 767 worker in Everett who happened to be near the union hall before the marchers arrived, said he thought the march was pointless.
"Boeing wants to deliver the 777X in 2020," he said. "They are only going to be able to do that if they build it here."
Washington has already passed legislation offering Boeing $8.7 billion in tax breaks over 16 years provided it builds all of the 777X in the state.
Meanwhile, other states submitted their bids Tuesday, most not revealing the incentives they have offered.
States around the country saw the site competition as an unprecedented opportunity to secure an advanced-manufacturing facility. Boeing's guidelines for formal bids projected that the 777X would bring about 8,500 high-paying jobs.
In addition to Washington, California, Missouri, Alabama and Utah all submitted bids for putting the 777X at existing Boeing sites, respectively in Long Beach, St. Louis, Huntsville and Salt Lake City.
Alder confirmed that some proposals had already come in and said the company "will begin looking over them in the coming days."
"Our goal remains to make a final decision early next year," Alder added.
Times business reporter Coral Garnick contributed to this report.
It's one step at a time - the first being to smooth the way for Boeing to construct a new facility to fabricate the 777X's composite plastic wing.
Union president blames Boeing's strategy to create a separate and lower class of employees in its manufacturing facilities.
Wing fabrication facility to sustain thousands of Puget Sound area jobs
The Machinists Union sent letters outlining their concerns to the largest 60 percent of each company's shareholders.