Making planes flyable in campaigns

Hey folks,
I would like to use my downloaded planes and alos the AI planes in the campaigns of CFS1, but I can not get them to fly. Does anyone have an idea what I can do?
thanks a lot
I would like to use my downloaded planes and alos the AI planes in the campaigns of CFS1, but I can not get them to fly. Does anyone have an idea what I can do?
thanks a lot