John Brattain

Established in 1979, Sage-Popovich, Inc. (SPI) is a global leader in aviation asset recovery, valuation, and management. With decades of hands-on expertise and a reputation for results, we support aircraft operators, financial institutions, and government entities worldwide through every phase of the aviation asset life cycle. We offer a full range of services. From appraisals and portfolio monitoring to repossessions, liquidations, and aircraft maintenance. Our ASA-certified appraisers and aviation professionals bring strategic insight and real-world knowledge to every engagement, helping clients navigate high-stakes decisions with clarity and control. With headquarters in Valparaiso, Indiana and operations across the globe, SPI is known for precision, reliability, and a direct approach. Whether it’s a single aircraft inspection or a complex fleet liquidation, our team delivers responsive support, technical depth, and solutions that stand up under pressure. As the aviation industry evolves, we continue to lead with integrity, adaptability, and commitment to excellence that has defined SPI for over four decades.