09/30/2012. Remarks by Johan Visschedijk: "Many US-built de Havilland D.H.4s and D.H.4Bs were rebuilt as D.H.4Ms (M for modernized) by Atlantic (later Fokker) at Hasbrouck Heights, Teterboro, New Jersey, and Boeing at Seattle, Washington. The D.H.4Ms utilized the wings, tails, powerplants and other hardware of the existing aircraft, but featured new fuselages of welded steel tube construction as developed by Fokker during WW I.
The pictured D.H.4M became the sole XCO-8 (s/n 23163) for the USAAS when fitted with Loening COA-1 wings. It went to McCook Field under Project Number P-369 and achieved a degree of fame when used by Captain O.A. Stevens for experiments in high-altitude and long-range photography through 1930."