Originally Posted by cmd320

The bulk of the design work for the A320 series occurred in the 1980s. And only recently Airbus added the NEO. Outside of that and the dozen A320-100s that were retired years ago, a 1990 A320 is about the same thing as a 2009 A320. To say it has changed as much as the 737 which has gone through now four very significant redesigns (five if you want to include the 737-400) is quite naive.