TRB’s Airport Cooperative Research Program (ACRP) Synthesis 1: Innovative Finance and Alternative Sources of Revenue for Airports explores alternative financing options and revenue sources currently available or that could be available in the future to airport operators, stakeholders, and policymakers in the United States. The report examines common capital funding sources used by airport operators, a reviews capital financing mechanisms used by airports, describes various revenue sources developed by airport operators, and a reviews privatization options available to U.S. airport operators.