First of all, if you don't install AFCAD files, there won't be as many planes as in the screenshots... default AFCAD layouts of the airports have just a few gates, and in FS2002 only one rwy is active at a certain time.
Second, you need the AFCAD program (v1.4) for FS2002 to install the new files you download from the Internet, or edit the layouts by yourself.
For FS2004, you don't need the AFCAD program (only v2.20 or higher work for FS2004), as the files you download are already bgl's... you would only need it if you want to edit the layouts yourself...
Sounds odd, but makes sense
