Boeing tried to screw Canada's Bombardier out of the C series aircraft by getting the US Gov to throw on tariffs for an aircraft they had no competitor for. Everything was already done AFAIK that point too; certifications, and everything, the plane was entering into production to fufill US airline orders. It cost $1.3 billion Canadian to develop the plane.
I suspect Boeing thought that'd be the end of it. Airbus had other ideas. They got the whole Bombardier C series aircraft for about $550 million and opened an assembly plant in Alabama in Mobile, about 350 miles from Boeing's assembly plant in Huntsville. Along with the orders from US airlines (I think for 130 aircraft). No more tariffs because these planes are now US made.
As a Canadian it stings a little, but I can't help but cackle at the fact that Boeing execs handed their one major competitor several billion in revenue on a silver platter. And Boeing will need years if not decades to come up with a competitor.
So from Canada: Get fucked sideways Boeing.