This sources sought notice is open only to current SEAPORT-NxG MAC holders. The effort covers engineering and technical services to support advanced air vehicle technologies, primarily through modeling and simulation for piloted and unmanned aircraft programs. Work includes dynamic simulation architecture, collision avoidance algorithm design, flight control and avionics prototyping, structures, propulsion, system safety, and acquisition support. The contract will be hybrid, with task orders issued as either cost-plus fixed fee or firm fixed price, and either term or completion type. Performance location, budget amounts, and submission timelines are not specified in the notice.