The US Department of Commerce has revealed its final ruling in a case filed by Boeing accusing Canadian plane maker Bombardier of intentionally introducing its C-Series aircraft into the US market at prices the government considers too low.

In the ruling, the department has upheld its previous finding that seeks to impose nearly 300% duty on the import of Bombardier’s C-Series aircraft configured with 100-150 seats from Canada.

The ruling is based on the antidumping duty (AD) and countervailing duty (CVD) investigations of 100-150-seat large civil aircraft from Canada to the US.

During the investigations, the US authority has found that exporters from Canada sold large civil aircraft in the US at 79.82% less than fair value.

It was also found that the Government of Canada provided unfair subsidies to Bombardier at a rate of 212.39%.

“The US is committed to a free, fair, and reciprocal trade and will always stand up for American workers and companies being harmed by unfair imports.”

Based on the latest ruling, the US is planning to instruct the country’s Customs and Border Protection to collect cash deposits from importers of 100-150-seat large civil aircraft based on the final rates.

US Commerce Secretary Wilbur Ross said: “This decision is based on a full and unbiased review of the facts in an open and transparent process.

“The US is committed to a free, fair, and reciprocal trade and will always stand up for American workers and companies being harmed by unfair imports.”

International Trade Commission expects to make a final decision regarding the ongoing dispute between Boeing and Bombardier by early next year.