There is a software even biz-jet manufactures are using to compare their aircraft with the competition which calculates the costs of virtual any biz-jet out there. I canīt remember the name. But, they are in this business for about 20 years now and lots of biz-jet buyers are using it. I just saw an article in EuroBusiness about this company. Maybe, someone else here knows the name and address. If not, I would ask some reputable biz-jet operator.