trainer aircraft; training plane
Refers to an aircraft used for pilot training, from small propeller planes to military jet trainers.
Flight schools conduct flight training using trainer aircraft.
This trainer aircraft is designed to be easy for beginners to fly.
旅客機 is a passenger airliner for commercial transport, whereas 練習機 is a training aircraft, often smaller and not for commercial use.
Compound of 練習 (れんしゅう, 'practice, training') and 機 (き, 'aircraft, machine').