Installation:

1: Install this mod:
https://www.gtainside.com/en/gta4/airplanes/84004-airbus-a319/

2: Extract the contents of this archive

3: Replace the "a319.wtd" file with either the one in the "old" folder for the original Airbus livery or the one in the "new" folder for the 2005 Airbus livery