The Globe and Mail reports in its Wednesday edition that Bombardier shares fell 7 per cent to $293.49 on Tuesday morning before clawing back some of those losses later after U.S. President Donald Trump's latest threats against the Montreal plane maker. The Globe's Nicolas Van Praet writes that analysts say it's not clear what legal mechanism the White House would use to stop the company from exporting into the U.S., and Mr. Trump hasn't explained what he intends to do. Bombardier jets are cleared for sale in the U.S. under certifications obtained by the Federal Aviation Administration. The mere threat of a ban, which comes as Canada imposes retaliatory tariffs on $28-billion worth of U.S. imports, is not a welcome development for Bombardier, however. "NO MORE SELLING BOMBARDIER IN THE UNITED STATES! Their products aren't good enough!" Mr. Trump wrote on his social-media platform Monday afternoon. The stakes are massive for the company, which sells more than half of its production volume into the U.S. market. In January, Mr. Trump threatened to decertify all Canadian and Bombardier-made jets. Experts say the President cannot target a particular company, but he can target a type of jet with certain characteristics.