Private, Corporate & Commercial Aircraft Appraisals plus

Helicopters, Vintage, Experimentals, Homebuilts, & Warbirds.

Call Direct at 630-815-5499

GLA Logo3.png

Guy Lieser, PSCA, is a Senior Associate in good standing of the Professional Aircraft Appraisal Organization (PAAO). Since 2002, he has completed more than 1,000 aircraft valuations for clients worldwide. All GLA appraisal reports are written in strict conformity with the Uniform Standard for Professional Appraisal Practice (USPAP). Click here for Curriculum Vitae, Certificate of training and PAAO association membership.

Types of Valuation Services Offered.

Certified Aircraft Appraisals

Market Value - GLA will develop an opinion of value regarding the most probable price that your aircraft should bring in a competitive and open market.


Retrospective Value - GLA will develope an opinion of value regarding your aircraft's value on a specific historical date. This type of appraisal is often used for estate matters, litigation, and insurance claims.


Prospective Value - GLA will develop an opinion of value for your aircraft based on a future date. This type of appraisal is commonly used to determine the aircraft's value of after damage repair, refurbishment, engine overhaul or avionics upgrade.

Other Value Determinations - GLA will determine Liquidation Value, Forced Liquidation Value, Diminution of Value, Replacement Cost, and Scrap Value.

Appraisal Review Services - GLA offers detailed appraisal review services. This type of appraisal service is typically used to determine the accuracy and compliance of a previously prepared appraisal report.

Additional Consulting Services

Qualified Expert Witness - GLA offers Subject Matter Expertise in the areas of Aircraft Valuation & Appraisal Reporting. Additionally we provide appraisal review services, deposition review & analysis, and support to attorneys & law firms involved in litigation related to aircraft valuation and appraisal reporting conformity.

Market Research - GLA offers comprehensive market analysis reports for specific year, make, & model aircraft. This type of data is useful for evaluating aircraft pricing, market activity, aircraft utilization and historical sales.

Contact Us - To discuss your aircraft appraisal needs please call us at 630.815.5499