President Donald Trump said he would charge a 50% tariff on aircraft from Canada sold in the US and decertify all planes made in that country until Ottawa agreed to approve certain jets made by Gulfstream, a unit of General Dynamics Corp. Trump said Canada had “wrongfully, illegally, and steadfastly refused to certify the Gulfstream 500, 600, 700, and 800 Jets,” in a social media post Thursday. In response, he said the US would decertify “Bombardier Global Expresses, and all Aircraft made in Canada, until s ...