personal aircraft; private airplane
Refers to an aircraft owned or exclusively used by an individual, often a small private plane. The term can also imply a dedicated or special-purpose aircraft in some contexts.
He travels around the world in his own personal aircraft.
The company president goes on business trips by private plane.
government plane; government aircraft
Compound of 専用 (sen'yō, 'exclusive use') + 機 (ki, 'aircraft'). The term is transparently derived from its components.