Airbus
Airbus is studying a replacement for the A320. This plane is called the Airbus NSR, for "New Short-Range aircraft". Those studies said that the NSR could burn 9–10% less fuel than the current A320. Instead of making a brand new plane, Airbus decided to make changes to the current A320 by adding winglets and other improvements. This updated type of A320 is called the "A320 Enhanced" and it should use 4–5% less fuel.