"This decision is based on a full and unbiased review of the facts in an open and transparent process", Commerce Secretary Wilbur Ross said in prepared remarks.
Today's ruling maintained a preliminary anti-dumping duty while slightly lowering the massive preliminary countervailing duty, reducing the overall duties on the C-Series from 299.45 per cent to 292.21 per cent.
The department has imposed tariffs of almost 300 per cent on imports of the jet after rival Boeing complained that it had received unfair subsidies.
Under a newly forged Bombardier-Airbus partnership a new manufacturing plant will be built in Alabama where the planes will be assembled, providing a possible avenue to avoid the hefty duty.
US trade officials are expected to confirm massive tariffs on Bombardier planes Tuesday in a case that has inflamed relations between Washington and Ottawa. The complaint found a receptive ear in President Donald Trump, whose "America First" agenda has included taking a tough line in matters of worldwide commerce.
The decision is not necessarily final; it could be overturned if the U.S. International Trade Commission finds that Boeing did not suffer material injury as a result of the Delta sale; the ITC's final decision is expected on february 1.
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In order to uphold the Commerce Department-proposed tariff, the International Trade Commission must find that imports of the C-Series planes will materially hurt Boeing.
Boeing argues that Bombardier signed a deal to sell its new single-aisle CS 100 planes with a price tag of just $19.6 million each, far below the $33.2 million construction cost, and a pittance compared with the list price of $79.5 million - though that amount is nearly never paid.
The move affects 100- to 150-seat large civil aircraft from Canada.
Delta plans to use the fuel-efficient but small mainline aircraft to operate flights to a broader array of midsize markets than it can efficiently do with its present fleet.
He also said that Boeing's claim was meritless since they don't have an aircraft that can compare to the CSeries.
Bombardier has said it's committed to opening a CSeries final assembly line in Mobile as part of a pending deal with Airbus, which has agreed to take an ownership stake in a CSeries joint venture with Bombardier and Investissement Quebec after clearing anti-trust reviews.
Bombardier calls Boeing's criticism an "unfounded assault on airlines, the flying public, and the USA aerospace industry", saying the entire complaint has been overtaken by events.