TRB's Airport Cooperative Research Program (ACRP) Synthesis 31: Airline and Airline?Airport Consortiums to Manage Terminals and Equipment discusses the current state of Airline-Airport consortiums in the United States. Issued addressed in the report include scope of responsibilities, consortium formation, membership, contractual agreements and insurance, organizational structures, performance standards, financial models, and organizing tips and lessons learned from existing consortiums. Issued addressed in the report include scope of responsibilities, consortium formation, membership, contractual agreements and insurance, organizational structures, performance standards, financial models, and organizing tips and lessons learned from existing consortiums.