A great enhancement to FS9 is this compilation of replacement autogen buildings by different authors and programs:

Gathered together for the texture of buildings all over the texture + default airport buildings. Some of the textures skonvertirovana MSFS X, of the textures John Venema koorbygen_lite, building airports - Chris Arrington AIRPORT ENVIRONMENT UPGRADE 7. (Google translation... :-))

http://www.avsimrus.com/f/fs2004-eff...n=download&hl=

Regard, Stuart