Boeing stated the decision validated its complaints about Bombardier's aircraft pricing in the United States, "pricing that has harmed our workforce and US industry".
United States secretary of commerce Wilbur Ross has found in favour of United States-based manufacturer Boeing in a dispute over aircraft sales.
The decision follows the DoC's preliminary recommendation of duties on Bombardier's C Series jets earlier this fall.
Boeing, which launched the trade case in April, is arguing that Canadian and British governments are subsidizing the plane's cost, allowing Bombardier to sell into the USA market at unfairly low prices.
"The United States is committed to a free, fair, and reciprocal trade and will always stand up for American workers and companies being harmed by unfair imports", he said in a news release.
As a result, the commerce department determined that exporters from Canada sold 100- to 150-seat large civil aircraft in the United States at 79.82 percent less than fair value.
That has been true since the start of the investigation, and recent developments make it even clearer, particularly the Bombardier and Airbus partnership, which will include the construction of a new US manufacturing facility in Alabama.
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"Today's decision validates Boeing's complaints regarding Bombardier's pricing in the United States, pricing that has harmed our workforce and US industry", it added.
The Commerce Department's decision comes as the Trump Administration takes a hard line on trade practices it views as hurting American workers.
The decision is subject to final approval by the US International Trade Commission, a quasi-judicial agency, which is due February 1, though it rarely differs from Commerce. The trade dispute stems from a complaint by US aerospace giant Boeing against its Canadian rival that found a receptive ear in President Donald Trump, whose "America First" agenda has included taking a tough line in matters of worldwide commerce.
"It's incredibly disappointing that the U.S. Commerce Department has made a decision to maintain punitive and unreasonable tariffs which hurt the entire aerospace sector", said Unifor National President Jerry Dias.
Bombardier doesn't deny that Delta received a good price. The company said that its deal with Airbus, including the Mobile manufacturing facility, makes the case against the complaint even clearer. Boeing, Bombardier and Delta presented arguments to the ITC this week.
Boeing called for action from USA authorities saying the C-Series competes with its small 737 jet, a point refuted by Bombardier.
The partnership with Airbus means there is "no chance Boeing will be harmed by imports", said Mike Nadolski, vice president of public affairs at Bombardier.