
1) Reconnaissance aircraft
Found on
https://www.crosswordclues.com/clue/scout-plane

A scout plane is type of surveillance aircraft, usually of single-engined, two/three seats, shipborne type, and used for the purpose of discovering an enemy position and directing artillery. Therefore a scout plane is essentially a small naval aircraft, as distinguished from a tactical ground observation aircraft, a strategic reconnaissance `spyp....
Found on
http://en.wikipedia.org/wiki/Scout_plane

(from the article `fighter aircraft`) Fighter airplanes have been described by a variety of labels. Early in World War I they were used as scout planes for artillery spotting, but it was ...
Found on
http://www.britannica.com/eb/a-z/s/50
No exact match found.