The 6,000th B-24 Liberator Bomber in flight, September 13, 1944 Year 1944 Month September Rights Held By Donated by the Ann Arbor News. © The Ann Arbor News. Copyright Copyright Protected Photo Subjects Old News Ann Arbor News Willow Run Bomber Plant World War II Airplanes B-24 Bombers Aerial Photo Willow Run (Mich.)