The highest rank of an airplane pilot is an airline pilot. In order to ensure flight safety, international pilots are usually divided into five grades, namely, flight cadets, junior pilots, commercial pilots, flight instructors and airline pilots. Details are as follows:

1. flight driver trainees: flight driver trainees refer to those who are undergoing aviation driving training. At this stage, students need to learn basic flying knowledge and skills through a series of theoretical courses and practical operations. They usually need to complete 40 to 60 hours of flight training before they can be promoted to junior pilots.

2. Junior pilots: Junior pilots refer to pilots who have obtained private driving licenses and can independently perform some simple flying tasks. They need to complete additional flight training and pass relevant examinations before they can be promoted to commercial flight pilots.

3. Commercial pilot: A commercial pilot refers to a pilot who has obtained a commercial pilot's license and can engage in commercial flight missions. They need to pass more rigorous training and examinations and have more professional skills and knowledge. Commercial pilots need to constantly update their skills and knowledge to adapt to different flight tasks and environments.

4. Flight instructor: A flight instructor refers to a pilot who has professional knowledge and skills and can impart relevant flight knowledge and skills to students. They need to undergo more rigorous training and examination before they can qualify as flight instructors. Flight instructors need to have excellent communication skills and teaching ability, which can effectively impart knowledge and help students improve their skills.

5. Airline pilots: Airline pilots refer to professional pilots working in airlines or other organizations. They need to have rich flying experience and professional skills and be able to complete complex flying tasks independently. Airline pilots need to constantly update their knowledge and skills to adapt to different flight environments and tasks.

In short, the classification of aircraft pilots is to ensure flight safety and improve flight efficiency. Pilots of different levels need different skills and knowledge to be competent for different flight tasks. In the flight mission, the pilot is an important guarantee to ensure flight safety, and his quality and skills are crucial to the success of the flight mission.