AI Traffic and Flight Plans

Hi!
I want to understand the difference between AI Traffic and Flight Plans. and
Which files are necessary to add AI Aircrafts in FS2004. and How would I see my added aircrafts flying and parking in FS2004?
I want to understand the difference between AI Traffic and Flight Plans. and
Which files are necessary to add AI Aircrafts in FS2004. and How would I see my added aircrafts flying and parking in FS2004?