Well this discussion certainly educated me.   Thank you all.  I thought that I had added too many aircraft, a pox on simviation for enticing me to do that, and that caused my AI traffic to disappear.

Has anyone created a good model of a T-37 for FS2002?  I was raised near a air training AFB in Texas and fell in love with T-38s, which I have a few sim versions,  but would like to add a Tweet to my inventory so that I can add AI profiles to and from AFB's.  Obviously this isn't important but more for nostalgia.