ADDING AC TO QC AND FF

:'( 
Okay guys;
Little bit of sympathy needed, I seemed to have lost a VERY important brain cell here.
I have been adding AC to my CFS2 and everything has been working great. All the aircraft were showing up in QC and FF, but suddenly, now only a few. All have AIR files, etc, and were working with no problem. Then BLAM just like my brain cells they were gone. :o
Here is my problem. I FORGOT if AC have to be manually added to QC, and FF, or do they automaticaly show up. If so please remind me which it is and, if manually ,how to do it.
PS I don't think I am anywhere near the dreaded 100 limit

Okay guys;
Little bit of sympathy needed, I seemed to have lost a VERY important brain cell here.
I have been adding AC to my CFS2 and everything has been working great. All the aircraft were showing up in QC and FF, but suddenly, now only a few. All have AIR files, etc, and were working with no problem. Then BLAM just like my brain cells they were gone. :o
Here is my problem. I FORGOT if AC have to be manually added to QC, and FF, or do they automaticaly show up. If so please remind me which it is and, if manually ,how to do it.
PS I don't think I am anywhere near the dreaded 100 limit