Long-time Airbus customer JetBlue Airways is the latest carrier to order the re-engined A320neo, pledging to acquire 40 of the type as part of a raft of adjustments to its narrowbody fleet.
The low cost carrier also plans to convert 30 of its 52 firm A320 orders to the larger A321s powered by IAE V2500 engines. JetBlue has only operated the A320 model since its launch 11 years ago.
Additionally, JetBlue is deferring eight A320s originally scheduled from 2014-15 to 2017 to reduce its capital commitments in the near term
http://www.flightglobal.com/articles/2011/06/21/358482/jetblue-orders-40-a320neos-converts-30-a320-orders-to.html