on 1 december 2010, airbus announced a new version of the plane, called the a320neo. with the a320neo, new engines will be used (the cfm international leap-x and the pratt &amp; whitney pw1000g) and some improvements have been made to the outside of the plane. winglets have also been added, which airbus calls "sharklets". the a320neo will use 15% less fuel than the current a320. virgin america is the a320neo's launch customer. as of 31 december 2011, 1,196 a320neo aircraft have been ordered by 21 airlines, which makes it the fastest-selling commercial aircraft in history.