US President Donald Trump posted on social media expressing dissatisfaction with Canada's improper, illegal, and steadfast refusal to certify Gulfstream Aerospace's most advanced 500, 600, 700, and 800 series aircraft. Consequently, the US revoked the certification of Bombardier Global Expresses and all Canadian-made aircraft until Gulfstream Aerospace's aircraft receive full certification. Related NewsBuilding Permits Prel for Nov in United States is 1.388M, lower than the previous value of 1.411M.The post further stated that Canada, through similar certification procedures, effectively bans Gulfstream Aerospace aircraft from being sold in Canada. If the situation is not immediately corrected, a 50% tariff will be imposed on any aircraft sold by that country to the US.