WASHINGTON — President Donald Trump on Thursday threatened Canada with a 50% tariff on any aircraft sold in the U.S., the latest salvo in his trade war with America’s northern neighbor as his feud with Prime Minister Mark Carney expands. But Trump’s threat did not come with any details about when he would impose the import taxes, as Canada had already struck a deal. In Trump’s latest threat, the Republican president said he was retaliating against Canada for refusing to certify jets from Savannah, Georgia-based Gulfstream Aerospace. Trump said the U.S., in return, would decertify all Canadian aircraft, including planes from its largest aircraft maker, Bombardier. Besides Bombadier, other major aircraft manufacturers in Canada include De Havilland Aircraft of Canada, which makes turboprop planes and aircraft designed for maritime patrols and reconnaissance, and European aerospace giant Airbus.