Aviation is undergoing a transformation. Advancements in technology are enabling innovations in regional and on-demand aviation. Many challenges are currently being addressed, including community acceptance, safety, equity, issues around planning and implementation, airspace, and operations. Transportation Insights 4: On-Demand Aviation Services for Mobility, Logistics, Emergency Response, and Humanitarian Use Cases , from TRB’s Airport Cooperative Research Program, summarizes an ACRP Insight Event held …