Hey! You're very welcome, I'm learning as much as everyone else is by trying to give as good an answer as I can to you all!

In general, I worked on the A220 very little and I'm not trained in any official capacity on it (no type course or anything). Moreover, the aircraft operations I work with now don't really overlap with any A220 operators so take my answer with a grain of salt, and it's going to be pretty generalized.

The Airbus A220 was originally the Bombardier C110 and C130 (different variants) and was subsequently redesigned to the CS100 and CS300 in 2009. Bombardier had a rocky start with it, having an engine failure early on in flight testing and getting into a pretty aggressive race with Airbus and their A320 program, which Bombardier was attempting to square off against.

After more testing, the CS100 and CS300 got Transport Canada approval in 2015 and 2016 respectively, and in 2018 Airbus aquired the type certificate and rebranded to the A220. (I gathered most of this info from the Wikipedia article... I had no idea about the pretty fascinating history of this thing besides the Bombardier involvement so thank you for prompting this!)

My opinion on the aircraft is generally good. I think it was designed to try and do things differently both in terms of customer experience and technologically. Innovation is not something that aviation is altogether famous for, and generally when a company does so in such a way that Bombardier did they come under heavy scrutiny by both Transport and the commercial market (which, realistically, is pretty cornered). I think this point increases tenfold with the early issues that the C100/130 had in testing. Getting approvals for anything is a huge time dedication and requires incredible amounts of persistance, money, and time. Our company has been involved in applying and receiving STCs (basically paperwork and plans that allow and certify modifications for an aircraft) and they take years of work to complete. I can't imagine how much more intense the process is for a commercial passenger airliner.

All of that to say, I would trust a Canadian or American maintainted A220 with my life. But that is just based off of what I know of the airframe and moreover, the industry itself and our standards for safety. Things break, but in general there are always safety nets that pilots and aviation professionals can deploy to mitigate any real world risk in 99% of situations.

I will never say that aviation is perfectly safe, because nothing is perfectly safe. But I have seen the firsthand diligence and procedures that we go through to minimize the risk to the absolute lowest probability, and it's a risk that I accept and face whenever I fly commercially, privately, for flight tests, and everything in between.