For those out of the loop, the Airbus A220 is actually the Bombardier C-Series, the plane that posed such a threat to Boeing and it's 737 that they outright tried to kill Bombardier with shady regulatory practices to avoid having to compete with it.
Thankfully Airbus stepped in to save the day and took a majority partnership with Bombardier to save Bombardier's C-Series.
Here's an insightful post on the topic from an old HN discussion.