Quality of exterior finish:
Whether used for dusting crops or transporting executives across Manhattan, appearance significantly affects value. Again, the NAAA appraisal process does this objectively and fairly.

What is the engine worth:
A fixed wing owner must consider the cost of overhauling engines and props. The helicopter owner has engines, main rotor, rotor head, tail rotor, swash plates, gear boxes, actuators, and other time limited components. Depending on the configuration, the same component has different life cycles and overhaul costs. These costs can affect the value by $1,000,000 and more. The NAAA appraisal process utilizes an extensive data base of component costs and the configured life cycles to develop a correct value for the residual life in the aircraft's time limited components.