Windsock is an aircraft valuation and aviation data platform for appraisers, brokers, dealers, lenders, insurers and flight departments. It values general aviation and business aircraft from FAA registry records, market listings and recorded sales, and publishes registry and typical-value pages for every US-registered aircraft. Paid plans add condition-adjusted valuation reports, logbook review, portfolio tracking and market intelligence, plus an Enterprise API and an MCP server so AI assistants and agents can run valuations, registry lookups, cost-of-ownership estimates and comparable searches. Windsock provides aircraft valuations to members of AOPA, the Aircraft Owners and Pilots Association, through its partnership with the association.