Bombardier called the USA decision "deeply disappointing" and said they expect the ITC to "reach the right conclusion, which is that the C Series benefits the US aerospace industry, USA airlines and the USA flying public".
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".
Labelling Boeing's complaint "meritless" and a "cover to close the US market", Mr Turner called on the US International Trade Commission (ITC) to set aside the Commerce Department's decision when it hears the next stage of the complaint in February.
Bombardier argued Boeing's large 737 order book shows there has been no adverse impact from its CSeries jet and that the USA planemaker does not manufacture a jet that competes with the new model.
Canada's ambassador to the United States, David MacNaughton, warned that a positive finding of material harm to Boeing by the ITC could represent a possible violation of World Trade Organization agreements and prompt a more formal complaint with the global trade group.
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.
The inquiry now moves to the United States global trade commission, which will examine if the dumping and subsidies caused injury to Boeing.
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There is more information on the USA department of commerce decision here.
Delta CEO Ed Bastian told Business Insider in a recent interview that the C Series plane is already made with at least 50 percent USA parts and moving its assembly to Alabama would boost that percentage up to about 60 percent.
"A single large order, like Bombardier's sale to Delta, takes years of demand out of the market".
In a twist, European aerospace company Airbus, Boeing's chief rival, swooped in October, agreeing to buy a majority stake in the struggling C Series program.
Boeing says that should not negate the duties because Airbus and Bombardier would import fuselages and wings and merely be assembling in the United States.
But Boeing's trade war with Bombardier has come with a price. The case has been a sore point in U.S.
The company's statement is an echo of one made by Canada's ambassador to the United States, David MacNaughton. Boeing suffered another setback last week when Delta announced it was ordering 100 Airbus planes to renew its narrow-body fleet in a move that analysts viewed as a snub of Boeing over the case.