American Aviation Historical Society

 
Two Northrop A-17 attack bombers of the USAAC. 4th Air Base Squadron. The A-17 was powered by a Pratt & Whitney R-1535-11 engine. The U.S. Army Air Corps bought 110 A-17s in 1935/1936.
(Photo by Russ Hiatt courtesy of Gerald Liang)

 

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