How can you add sound to your flyable AI traffic?

The only way to add takeoff sounds is to buy FSHotSFX which is not really supported anymore, except for registration resets.  It is NOT compatible with any OS newer than XP, and you should try out the demo first before buying to be sure it works on your system.

For landing tire chirp and reverse sounds you have two choices - FSHotSFX above, or a modified touchdown effect file.  An example of the latter approach is found in my AI Propliner/Jet Sound Effects package, file #10 in my Classic AI package:  http://www.calclassic.com/AIAircraft.htm. ; It can be used for most any AI aircraft.

Hope this helps,