The oldest 737-700's and A-319's we have now were purchased in the '97-'98 timeframe. We still have about 5 good years left on them. In 5 years the C-series will be vetted and past the teething pains. The CS-300 fuel efficiency smokes the Max 7 and 319 Neo. At least from my amature research. I'm thinking at some point down the road there will be an order for the CS.