Check the documentation of your add-on to know which textures you
added in FS98 and must be ported over to FS2004...

The documentation doesn't offer much of help since this file is part of an
entire scenery area.

If I won't find a way for FS2004 to generate generic textures within this
airport perimeter, what I'll end up doing, is probably copy the all FS98
texture files into the FS2004 texture directory and cross my fingers for any
conflicts or incompatibility issues.