By Paul Vieira, Dean Seal, and Christopher Kuo

President Trump threatened to decertify Canadian-made aircraft and apply tariffs on imported jets in retaliation for what he said was the country's refusal to certify U.S.-made Gulfstream jets.

Trump said Thursday on Truth Social that the U.S. would decertify the Bombardier Global Express, "and all Aircraft made in Canada," until the Gulfstream products received full approval. He also said the U.S. could apply a 50% tariff on Canadian aircraft if the Gulfstream jets aren't approved.

A spokesperson for the White House didn't respond to a request for comment. A Canadian government representative didn't respond to a request for comment.

The Federal Aviation Administration is responsible for certifying civil aircraft in the U.S., including planes that will be used in commercial aviation. An FAA spokesperson for the agency didn't respond to a request for comment.

Representatives for Bombardier and General Dynamics, which owns Gulfstream, didn't respond to a request for comment.

Trump's post marks the latest point of conflict between Washington and Ottawa, as relations have deteriorated this month following Prime Minister Mark Carney's decision to strike a trade detente with China, America's biggest rival. Carney also recently delivered a speech that was widely interpreted as a rebuke against the Trump administration's use of economic coercion for policy purposes.

Last week, Trump threatened 100% tariffs against all Canadian imports in the event Canada struck a free-trade pact with China. Carney said Ottawa has no intention of pursuing such a deal, and that the agreement reached with Beijing focused on reducing tariffs on China-made electric vehicles and Canadian agricultural products, like canola seed.

Write to Paul Vieira at Paul.Vieira@wsj.com, Dean Seal at dean.seal@wsj.com and Christopher Kuo at chris.kuo@wsj.com

(END) Dow Jones Newswires

January 29, 2026 19:29 ET (00:29 GMT)

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