Identifier1995-06-23-17_image_005SourceThe David D. Hatfield Aviation Photograph Collection (1995-06-23-17), Print Box 8, Folder 4DescriptionPhotograph of a Boeing PW-9D "blackboard plane" of the United States Army Air Corps, California, circa January 1929. The chalk message on the fuselage reads: "Mrs. Spatz sends love to the Major and greetings to the crew." The plane also bears the emblem of the 95th Pursuit Squadron. 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"], [1995-06-23-17_image_005]. Museum of Flight Digital Collections, accessed 11/10/2026, https://digitalcollections.museumofflight.org/nodes/view/3347