Bombardier also build CRJs, business jets (Globals, Challengers and Learjets), does government work and builds fire-fighting aircraft. Oh, and the C-Series is a brand new a/c entering into the lower end of the Boeing market.

That being said, building even these small aircraft is a multi-billion dollar investment. If people here think that software design is hard. It takes a monumental amount of work to design a commercial aircraft and the manufacturing processes around it. Oh, and then there is the test phase. That part is fun.