Answer: triplane

AnswerCrossword Clue
TRIPLANE

WWI innovation

TRIPLANE

WWI aircraft

TRIPLANE

Sopwith Camel predecessor

TRIPLANE
WWI flier
TRIPLANE
Early flying machine.
TRIPLANEW.W. I craft
TRIPLANEThe Red Baron flew one
TRIPLANEAircraft for the Red Baron