Adding Data to PACX Adding Data to PACX is simple, and takes little time. This guide will outline how to add aircraft (along with their respective seating plan), adding new airports, adding new flight comments to your flights and adding new names that passengers can use when you start a new flight. Each of these parameters are edited via their respective .xml files. Take note of the the location of each file. The PACX installation directory, by default, is C:\Program Files (x86)\TFDi Design