Aircraft evaluations are made for all direct operating costs that can be linked directly to the operation of the airliner.
The costs can be divided in Cash Operating Costs (COC), which covers the operation of the aircraft and capital costs. Combined these costs constitute the Direct Operating Costs, DOC.
The OEMs produce data for all COC cost items, but they do that in their own way. To make the costs comparable one need to know and understand their assumptions and neutralize these through independent modeling of the costs.
We describe what these assumptions are and how to neutralize them.