How much is an aircraft worth? Most of the private propeller aircraft are more than 30 year old. Over the years these aircraft have been modified, upgraded, and refurbished to the point where many look and perform like a new plane. But others have had less updating.
The very nature of older aircraft dictates that No Two Are The Same.

Maintenance Counts:
Maintenance accounts for a major portion of the cost of ownership. An aircraft due for a major overhaul is worth considerably less than one recently overhauled. Aircraft with a damage history have less value than a plane with a clean history. The NAAA appraisal process and software fairly and objectively asses the value of components requiring routine maintenance and damage history.

Avionics:
Not only are there thousands of avionics types, manufactures, and model combinations but they differ widely in value. Consequently avionics have a substantial impact on the aircrafts value. It is not uncommon for the value of avionics from one aircraft to another to differ by $100,000 or more Failure to consider the avionics would be a major error. The NAAA process does it right!