Final answer:
The official statement for billets, personnel, and training input and resource requirements to support the introduction and operational use of aircraft and other developments is known as the Requirements Document.
Step-by-step explanation:
The official statement you are referring to is called the Requirements Document. It outlines the billets, personnel, and training input and resource requirements needed to support the introduction and operational use of aircraft, systems, subsystems, equipment, and other developments, including non-hardware related developments.
For example, Boeing, a major aircraft manufacturer, includes potential customers in their design process. They gather requirements from airline representatives early in the design process and have them serve on their design-build teams. This ensures that the aircraft and related developments meet the needs and expectations of the customers, and that the necessary resources are allocated for implementation and operation.