Identifier1995-06-23-17_image_006SourceThe David D. Hatfield Aviation Photograph Collection (1995-06-23-17), Print Box 8, Folder 5DescriptionPhotograph of a Boeing PW-9D "blackboard plane" in flight over California, circa January 1929. The chalk message on the fuselage reads: "Fine work! I am excited & delighted as I can be. (Sgd) F. T. Davison [Frederick Trubee Davison, Assistant Secretary of War]." The PW-9D blackboard planes were used to send messages to the crew of the radio-less "Question Mark," an American-built Fokker C-2A, during their record-setting endurance flight in 1929.
[Boeing PW-9D "blackboard plane" in flight], [1995-06-23-17_image_006]. Museum of Flight Digital Collections, accessed 16/10/2026, https://digitalcollections.museumofflight.org/nodes/view/3348