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![[Aerial refueling procedure between Douglas C-1 aircraft and Fokker C-2A "Question Mark]](https://digitalcollections.museumofflight.org/files/square_thumbnails/c5afba6788c2e5e65d5148f5522062c7.jpg "[Aerial refueling procedure between Douglas C-1 aircraft and Fokker C-2A \"Question Mark]")
Photograph of an aerial refueling procedure between a Douglas C-1 aircraft and the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.
![[Douglas C-1 aircraft aerially refueling Fokker C-2A "Question Mark"]](https://digitalcollections.museumofflight.org/files/square_thumbnails/b82da51a6823a23ce5d56156c4e4f04f.jpg "[Douglas C-1 aircraft aerially refueling Fokker C-2A \"Question Mark\"]")
Photograph of a Douglas C-1 aircraft (fuselage number 1) aerially refueling the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.
![[Douglas C-1 aircraft aerially refueling Fokker C-2A "Question Mark"]](https://digitalcollections.museumofflight.org/files/square_thumbnails/44aafa36080b0669f53ef7008a0896e2.jpg "[Douglas C-1 aircraft aerially refueling Fokker C-2A \"Question Mark\"]")
Photograph of a Douglas C-1 aircraft (fuselage number 1) aerially refueling the "Question Mark," a U.S. Army Air Service Fokker C-2A aircraft, circa 1929.