Originally Posted by sailingfun

It's a great aircraft however there is one major issue. It's to small for the US market long term. That more than price is why it has sold so poorly. The paper CS500 will lose much of the performance of the 100/300 unless it gets a bigger wing and engines.
Delta is the only US legacy with any long term plans to operate a aircraft with less then 150 seats. JetBlue is the only low cost carrier with that plan.