Moving to end a threat of international trade sanctions against Boeing, lawmakers in Washington State on Wednesday introduced legislation that would eliminate tax breaks for the plane maker.

The World Trade Organization concluded last year that Boeing benefited from unfair subsidies from the state worth roughly $100 million a year.

State Senator Marko Liias, a sponsor of the bill, said the proposal had come from Boeing itself. The Legislature is expected to act before its session ends on March 12.

Boeing was founded more than a century ago in Seattle, and though its headquarters are now in Chicago, Washington State remains its manufacturing hub. It also has a factory in South Carolina.