How many aircraft types are explicitly identified in the text?

The correct number of aircraft types explicitly identified in the text is five. This is determined by carefully examining the content that lists each aircraft type, ensuring that each one is distinctly noted. Each type likely represents different models or variants within the fleet, which can have implications for operations, maintenance, and training.

Understanding the specific aircraft types is crucial for familiarity with their unique characteristics, operational procedures, and potential differences in service requirements. By recognizing all five listed types, personnel can gain a more comprehensive understanding of the fleet, which is essential for effective flight operations and management.