HELP!!!!!!

[P-40_Warhawk]

I am working on a scenery for elmira in New York.
It includes 3 static fs98 planes, a custom building, flat area, and a parcking lot with a couple cars. (Its made for FS9 in FSSC) If I try to start out in elmira cornin regional airport the loading stops at around 68% at I have to ctrl-alt-delete out of FS9. If I get rid of a plane macro it works but at the same time if I keep the macro but vary the altitude the sim doesnt load. There is a lot of scenery that is more complex than mine so what could be wrong?