The Cunningham Hall GA 36 I believe - if correct - immediate OH as 24 hours have passed
https://niagaraaerospacemuseum.org/c...am-hall-ga-36/
"It is the first plane to feature double motion wing flaps devised to lower landing speeds and not flying speeds. The GA-36 featured two cockpits and fixed landing gear. Cunningham-Hall tried to sell this design to the Army and Navy. Both declined, saying the aircraft was too expensive to produce."