The Allied demand for huge quantities of advanced bombers fueled a rapid increase in production and personnel at Boeing. The large work force of talented engineers and armies of production workers turned out B-17 Flying Fortresses and B-29 Superfortresses in astonishing numbers. Under a unique wartime arrangement, aircraft manufacturers across the country developed techniques for mass production and shared production of the most popular military aircraft, including the B-17s and the B-29s. Thousands of women took up the slack in the work force and helped boost production to an astounding 362 airplanes a month by March 1944.