Thin-haul aviation offers the potential for transforming mobility. The thin-haul commuter concept envisions four to nine passenger aircraft operating very short flights for scheduled and/or on-demand air services from smaller airports. However, achieving safe, cost-effective, and high-volume operations will require novel air traffic management concepts integrating these thin-haul aircraft into existing operations, particularly at small airports. This paper describes a process to design such air traffic concepts of operations. The process is demonstrated by designing concept of operations applying helical descents at Wittman Regional Airport in Oshkosh, Wisconsin, the site of the EAA AirVenture air show. The process includes both the design of the geometric airspace structures and the actions that represent the work that needs to be done in the concept of operations.