Airbus > Mitsubishi > Boeing > Bombardier
Airbus - Gained a brand new aircraft for close to nothing, allowing it to sell at a discount that Boeing may not be able to do. Can wait to make key strategic sales for after they purchase Bombardier's 30.99% stake.
Mitsubishi - Learned what to do and not to do from the Bombardier saga. Also learned that there is a potential market for a third competitor.
Boeing - Staved off a potential third competitor which could dilute the profitability of the segment. Didn't want to make the same mistake when it didn't consider the Airbus could become the giant it is today decades ago. (As of today, lost 15% stock from its previous peak, although it may be due to a variety of other problems, including the China/US trade spat)
Bombardier - Was forced to sell off its new jet for close to nothing.