You don't understand at all. When foreign manufacturers get huge subsidies from their government, they can undercut prices, which hurts the manufacturers in the countries that
they sell to. Cheaper aircraft, also allow reduced airfares, which hurts the competing airlines. There is absolutely nothing wrong with level playing fields for global trade. Think about it and assume you were laid off from an importing country manufacturer because sales dried up due to artifically lower prices from competitors from other countries (subsidies). Think like this and you will understand why and how it hurts importing countries, even if the product is inferior, as was the Embraer product in the early 1980s.Our govt. officials said they would not impose a 28% tariff (duty) then because Brazil was an underdeveloped country and owed more to Citibank than its net worth. This is politics at play--helping the less fortunate countries at a large cost to American workers. Not good!!! Trump ran on "setting a level playing field for trade" and this is one small component of that pledge--good for America and American workers.

Understand, but there is a difference. American gov't (DOD etc.) should buy American when it is practical to keep jobs, technology, etc. advantages, However; the commercial airline industry is a completely different world. Canada, Brazil and some others foreign airframe companies "dump" their products at country subsidized prices and financing, which gives them a huge competitive advantage. Many of these countries (such as Brazil) believe the subsidies are a good substitute for welfare. I have visited their factories and they also employ many more people for specific jobs than our American airframers, as they want their people to work rather than be strictly on other government social and welfare programs. These subsidies disrupt and in many cases kill good paying U.S. aerospace jobs. One more factor that lowers our US wages and forces workers to take unemployment and lower paying service sector jobs. We need to look out for ourselves and all we ask for is a level playing field, which most of these other countries have agreed and signed up for.
The commercial airline business is a very competitive and low profit business, so cheaper aircraft and/or cheaper financing will be a major deciding factor when selecting new equipment. It does make a huge difference.

So Boeing's nose is out of joint because Bombardier has produced a superb plane? and they don't have a plane in this size range to compete? Does the Trump gang not realise how absurd this is?? And what about Delta-last I heard they were a US company, so why doesn't this nationalist protectionism cover their business interests too?
Can't wait to see Air Canada Cseries put on the Seattle routes so they can waggle wings over Renton on approach!

Codswallop. Boeing has no a/c to compete with Ab and Bombardier.

The US government has ALWAYS lent a very helpful hand to such companies as Boeing, Lockheed, et al, especially the former 2. Without going very far back, just look at the Pegasus (KC-767) contract, that was handed over to Boeing after Airbus had won it with their A330 MRTT... every major defense or strategic player in the world has their backs covered by their respective Governments. There should be no surprise here. It's simply the way the game is played.

You have to respect any government that works to provide meaningful work for its citizens, however, buy creating an unfair advantage for a Canadian company to the detriment of US workers and investors.

They now display the ultimate aggressive stance by demanding the case to punish them for their transgressions be dropped, and the punitive tariffs MUST be rescinded. It is about time America stop being a door mat for this type of attack on our economy. Then they threaten a boycott of American defense airplanes. I would say fine, buy Migs or Mirage's, but that would not be fair to the good people living in Canada and the UK that deserve the finest protection.

I would say that if the tariffs level the playing field the telephone at the 737 sales desk will start taking calls from Atlanta.

I have been the subject of predatory pricing by Embraer and in a resulting counter veiling duty suit, which we won, but the White House over-ruled. Their financing and pricing subsidies nearly killed our American business, even though we had a much better product.
With actual experience, I'm pleased to see the U.S. is finally supporting its businesses, by making aviation trade a level playing field. Govt subsidies are not only unfair trade, but against international agreements where countries have agreed not to provide them. Canada has long been known as well for its aviation subsidies. They should be punished to allow for a level playing field.