noun
rescue plane; evacuation plane; humanitarian aid aircraft
Refers to an aircraft used for rescue, evacuation, or humanitarian aid missions. Often used in news or military contexts.
救援機が被災地に緊急物資を届けた。
The rescue plane delivered emergency supplies to the disaster area.
政府は救援機を派遣して、孤立した住民を避難させた。
The government dispatched an evacuation plane to evacuate the isolated residents.
救助機 is a more general term for a rescue aircraft, often used for search and rescue. 救援機 can imply broader humanitarian aid or evacuation missions.
Compound of 救援 (rescue, relief) and 機 (aircraft). The exact historical derivation is uncertain, but the word follows a common pattern for naming specialized vehicles.