The Douglas XO-31 was the company’s first observation aircraft with a monoplane design.
O-46 of the 118th Observation Squadron, Connecticut National Guard
O-43 of the 22nd Observation Squadron.
Exactly one YO-31C was built. (Its cantilever landing gear was the most noticeable feature).
An O-35 at Boeing Field.
The lone O-31 “B” model was used by the War Department Militia Bureau (note the two stars on the fuselage).
O-38B of the 116th Observation Squadron, Washington National Guard.
O-31A of the 5th Observation Squadron.
O-38B (30-419) of Ohio’s 112th Observation Squadron.
The Jive Bomber 
“An O-35 at Boeing Field.” – Back when it was still a field.
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