Got 2002 Pro. I suddenly noticed that at least two planes were missing in the list of options. Dash and MD83. Looked into the aircraft sub-directory, and yes, the good sub-directories were present, but none of them had a sub-sub-directory PANEL. ???? OK, I re-installed FS2002 in part. That is: left out the heavy scenery stuff. Assuming that nothing would change in that respect.
After the (partly) re-install Dash and MD83 still absent, but two other changes:
1) it is impossible to start the game without disk 3 (??)
2) mountains were gone, and replaced by rather flat hills (!!!)
Anybody familiar with these rather strange effects?