I originally wrote my Aliasing article for CFS. You shouldn't need it for installing FS2002 aircraft to FS2002 Pro. The most common cause of new aircraft not displaying on the selection menu is when the actual aircraft is hidden inside one or more other folders. With the variety of unzipper utilities available nowadays & different methods used to install files it's not so easy to give general advice as it used to be.
Please take my tip & NEVER extract zipfiles direct to the sim. Extract them to a Temp folder & examine the folders carefully before pasting the "Aircraft Container" (that's the folder directly containing the familiar Model, Panel, Sound & Texture folders) into FS2002\Aircraft. If gauges are included they will usually be in a separate folder named Gauges or similar. To install the gauges open the Gauges folder & click Edit/Select All. Paste the complete contents into FS2002\Gauges. Do NOT overwrite existing files/folders if prompted. The aircraft will be selectable without the gauges installed.
May I suggest you study this aircraft installation tute & follow the instructions carefully.
http://www.simviation.com/acinstall.htmIt explains all this much better than I can do here.