The U.S. Commerce Department on Tuesday slapped preliminary anti-subsidy duties on CSeries jets made by Bombardier Inc. after rival Boeing Co. charged that the aircraft were unfairly subsidized by Canada.

The department said it imposed a 219.63 percent countervailing duty on Bombardier's new commercial jets after it made a preliminary finding of subsidization. Boeing has complained the 110- to 130-seat aircraft were dumped below cost in the U.S. market last year while benefiting from unfair subsidies.

An April 2016 order for 75 CSeries jets from Delta Air Lines stemmed from the same harmful sales practices European rival Airbus SE employed to win business in the 1990s, according to Boeing.