Waco JYM / JWM
Two mailplane derivatives from the O series (types JYM and JWM) were single seaters with a 14" stretch in the fuselage.
The JWM was a straightwing derivative of which two were built.
The JYM was a taperwing derivative of which four were built for Northwest Airways.
Engine: 1 x Wright R975 / J-6-9, 330 hp (224 kW)
Engine: 330 hp (246 kW) Wright R-975