The technological change that led to more business for Boeing during World War II was the increased demand for airplanes and advancements in airplane technology, specifically the development of long-range bombers. The Boeing B-17 Flying Fortress and the Boeing B-29 Superfortress were two of the most important airplanes developed by Boeing during this time, and they played a crucial role in the Allied victory. The increased demand for airplanes resulted in a huge boost for Boeing's business, as the company was able to produce thousands of planes during the war and establish itself as a major player in the aviation industry.
