There doesn't seem to be any links to that on Wikipedia. The only text I can find is: "After it had to cut its price by 70% to beat the CSeries for United Airlines in 2016, Boeing decided to act when the CSeries was offered to Delta at $10 million below its production cost".
Perhaps the Wikipedia page is being edited by Boeing?
Wow, that's masterful. Incredible.
So Boeing dumps, then accuses Bombardier of dumping? That's classy.
Is this how the free market is supposed to work?
I think you are confusing the word "fair" with free.
National dumping is unenforced, but for international dumping there are teeth