What does "Airworthiness" mean for an aircraft?

The term "Airworthiness" refers to the overall condition of an aircraft that ensures it is safe for flight. Specifically, it implies that the aircraft is of proper design and construction and complies with safety standards established by aviation authorities. This ensures that the aircraft can operate safely and effectively under its intended use, without compromising the safety of its passengers or crew.

Other options address elements related to airworthiness but do not encapsulate its full definition. For example, stating that an aircraft has been issued an RTS (Return to Service) might indicate compliance with certain regulations but does not fully explain the concept of airworthiness itself. Similarly, inspection by an airworthiness inspector or an engineer can contribute to determining airworthiness, but these actions alone do not guarantee that the aircraft meets all necessary design and safety criteria. Thus, the comprehensive nature of option A makes it the most accurate definition of "Airworthiness."