lol...
Ok if I understand it correctly you have successfully installed project ai packages and see prioject ai aircraft flying by themselves just like they should correct?
however, with the original traffic airplanes, there are two of everything correct?
To be more specific do we have duplicates of the general aviation aircraft as well?
First thing to do is find all the traffic files and back them up in a different spot, just in case something wrong does happen.
Next go to the project ai site and find the file that says it will remove original airline traffic. Run this file using the installer/uninstaller, and they should dissappear, if they don't come back here and tell us and we will try to help you out... ;-)