Production. Airplane manufacture, general. Sorting rivets may seem a lowly task in the making of war planes. But it plays an essential part in the mass production of aircraft and in the conservation of vital materials. These workers at the Long Beach, California, plant of Douglas Aircraft Company help to keep many others working. Most important of the many types of aircraft made at this plant are the B-17F ("Flying Fortress") heavy bomber, the A-20 ("Havoc") assault bomber and the C-47 heavy transport plane for the carrying of troops and cargo

The Boeing B-17 Flying Fortress is a four-engine heavy bomber developed in the 1930s for the United States Army Air Corps. Although Boeing lost the contract because the prototype crashed, the air corps was so impressed with Boeing's design that it ordered 13 more B-17s for further evaluation. The B-17 was primarily employed by the United States Army Air Forces in the daylight precision strategic bombing campaign of World War II against Germany. The B-17 also participated to a lesser extent in the War in the Pacific, early in World War II, where it conducted raids against Japan.

World War II was a period of rapid technological advancement in the field of aircraft, and these advancements have continued to shape the development of aircraft in the years since. There were significant advances in aircraft design, such as the use of swept wings and the development of more advanced aircraft materials, such as aluminum alloys and plastic composites. These advances allowed for the construction of stronger, lighter aircraft that was capable of higher speeds and greater maneuverability. Biplanes, which have two main wings stacked one above the other, were largely obsolete by the time World War II began in 1939. They had been largely replaced by monoplanes, which have a single main wing, by the start of World War II. The main advantage of monoplanes is that they are typically faster and more maneuverable than biplanes due to their streamlined design. In addition, monoplanes are able to carry a greater load for their size, making them more suitable for use as bombers and transport aircraft. However, biplanes were not completely abandoned during World War II. Some biplane designs, such as the British Hawker Hurricane and the Soviet Polikarpov I-153, saw limited use as fighters. In addition, biplanes were used in a number of other roles, including training, observation, and light transports. One of the major developments in aircraft technology during World War II was the use of jet engines, which allowed for faster and more powerful aircraft. The first jet aircraft, the German Heinkel He 178, made its first flight in 1939. However, it was not until after the war that jet aircraft became widespread. During World War II, a number of aircraft were produced in large quantities to meet the demands of the war. Here are some examples of some of the most massively produced aircraft of World War II: The Soviet Union's Ilyushin Il-2 was a ground attack aircraft that was produced in tremendous numbers, with more than 36,000 being built. It was heavily armed and armored, making it a formidable opponent on the battlefield. The German Messerschmitt Bf 109 was a mainstay of the German air force and was produced in large numbers, with more than 35,000 being built. It was used as a fighter, interceptor, and ground attack aircraft, and saw action on many fronts during the war. The American Republic P-47 Thunderbolt was a heavily armed and armored fighter that was produced in large quantities, with more than 15,000 being built. It was used extensively in Europe and the Pacific and was known for its durability and long range. The British Supermarine Spitfire was a highly regarded fighter that was produced in large numbers, with more than 20,000 being built. It saw action in many theaters of the war and was known for its agility and handling.