Whenever FR got airplanes at high rebates like after 9-11 they made a deal reselling them young later on to the next operator. Not sure if current Boeing contracts still permit this business model unlimited but the old one did. There is a market for NGs so why not standardize their own fleet with the most efficient engine like they did with wingleted NGs before? Now or never is the time. By definition they must be able to offer the cheapest tickets so they need the most efficient equipment don't they?