Aircraft type, aircraft size, number of terminals, and degree of nonstop routing for a V/STOL transportation system in the Northeast Corridor are chosen by exploring a wide range of combinations. Helicopter and STOL aircraft from 20 to 200 seats are considered. From 15 to 20 total terminals were considered. Nonstop, one stop and two stop routings were used. A market model explores the response of a typical route to variations in these parameters. Demand response to the total trip cost, trip time, and frequency of service is measured by a modal split model.