I'm thinking a De Havilland dh.86 but if it is they modified the struts closest to the fuselage to accommodate larger entry for wounded. Which means..it's probably not. Hoping for a clue, if not the prize.

Not a De Havilland, but this aircraft was a first ???????

CLUE designed as an aircraft to replace modified de Havilland DH.4 aircraft ???????????????

Powered by aLiberty L-12A V-12 liquid-cooled piston engine, 420 hp (310 kW),only two built.

That did it! I do believe this is a shot of one of the few Curtiss Eagle III purchased by the US Army and used for transport...even converting one to an air ambulance.
(Thanks for doing this Duggy, its a nice diversion on crappy work days)
Derek

Close but no stewardess.
This was the first with an "A-1" & single engined??

LAST CLUE - Grumman was to open its first plant in the ************ facility in 1929.

Is it a Loening OA?

No stewardess -- The answer - http://www.axis-and-allies-paintworks.com/e107_plugins/forum/forum_viewtopic.php?11142.last

This weeks headache ?

Have fun.