What is 'airworthiness' in the context of aviation?

Airworthiness refers specifically to the condition of an aircraft in relation to its safety and fitness for flight. An airworthy aircraft complies with all legal and regulatory requirements, is maintained in accordance with manufacturer specifications, and is equipped with all necessary components functioning properly. This means that regular inspections, maintenance, and modifications are carried out, ensuring that it can perform safely and as intended under normal operating conditions.

Understanding this is crucial for pilots, as they are responsible for ensuring that the aircraft they operate is airworthy before embarking on any flight. The other options provided do not relate to the core definition of airworthiness, as they focus on performance, weather conditions, or economic factors rather than the safety and regulatory aspects central to an aircraft's fitness for flight.