VTOL/SP is an MDC proprietary vehicle synthesis program developed specifically for vertical takeoff and conventional fixed-wing cruise aircraft. The method solves for the design optimization parameter (mission design gross weight) from a set of governing equations for the entire aircraft. It is set up to run interactively, so that solutions can be obtained quickly. The program has been used for parametric studies of the Advanced Technology Transport (ATT) and Special Operations Forces (SOF) aircraft. In-house trade studies are included to demonstrate the capabilities of the program.