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Charles M. Schulz–Sonoma County Airport (STS) in Santa Rosa, CA is in the midst of a $31 million terminal expansion and renovation … The bulk of the project is being funded with a $20 million federal Airport Improvement Program grant specifically earmarked for terminal projects. A loan, backed with proceeds from a $4.50 per ticket passenger facility charge and airline rent and landing fee payments, will cover the balance of the tab.