The US Commerce Department has added to Canadian plane maker Bombardier's problems with the announcement of a further import duty on its CSeries aircraft.
A second preliminary levy of 80% has been loaded on the sales of aerospace manufacturer Bombardier.
"Boeing is manipulating the US trade remedy system to prevent Bombardier's new aircraft, the CSeries, from entering the USA market, despite Boeing's admission that it does not compete with the CSeries", foreign minister Chrystia Freeland said in a statement.
Specifically, Boeing charges that Bombardier a year ago sold Delta Air Lines 75 CS100 aircraft for less than it cost to build them.
"Boeing had the chance to compete with Bombardier for Delta's purchase of aircraft in this size range, but Boeing's only proposed alternative to the CS100 was to offer Delta used Brazilian-made regional jets", Delta said in an e-mail statement cited by Bloomberg, explaining that Boeing simply doesn't produce aircraft of the size range it wanted.
A final decision on any US duty is expected next year. "Boeing is manipulating the USA trade remedy system to prevent Bombardier's new aircraft, the C Series, from entering the United States market".
The Commerce Department proposed a 79.82 percent antidumping duty on Friday, on top of a 219.63 percent duty for subsidies announced last week.
Several U.S. senators and House members also expressed their unhappiness, calling the decision "shortsighted" because it threatens thousands of jobs across the country supported by Bombardier and its suppliers.
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Bombardier said the complaint can not be justified because Boeing did not have a plane that matched the Delta specifications when the bid was awarded to the Canadian aircraft manufacturer in 2016.
U.S. Commerce Secretary Wilbur Ross said the decision affirmed Trump's "America First" policy.
"We will continue to verify the accuracy of this decision, all the while doing our best to defend the american companies and their workers", said Mr. Ross in a press release.
"We will stand up and we will fight".
The Bombardier tariff row has been taken up a notch after the US Department of Commerce has ruled again in favour of US rival Boeing. The total list price value of the order is USD$5.38 billion, or $71.8 million per aircraft, but Boeing said the price paid was $19.6 million per aircraft.
"This determination confirms that, as Boeing alleged in its petition, Bombardier dumped its aircraft into the US market at absurdly low prices", the company said in a statement.
The programme is not just important to Bombardier jobs in Belfast, but also to 15 smaller aerospace firms in Northern Ireland - and dozens more across the United Kingdom - which make components for the wings.