World War 2 aricraft windows made of?

Answer 1

Review this site: (excerpt) At the start of World War II engine power was scarce and aircraft had to be tailored to individual roles. Ground attack aircraft during this era were generally created for the role, one that was considered largely unimportant and therefore saw little development. Perhaps the only early-war aircraft in this niche was the Henschel Hs 123, a biplane. The Germans worked on a suitable replacement and eventually delivered the Henschel Hs 129, which featured a steel-armored cockpit and windows made of bulletproof glass. Only small numbers were built, however, as the Germans widely used the more flexible Junkers Ju 87 Stuka dive-bomber in the ground attack role. A more famous example is the Soviet Ilyushin Il-2 Shturmovik, a light bomber that was adapted into the ground attack role with it armoured fuselage, powerful artillery and possibility of using air-to-ground missiles. More than 43,000 Ilyushin Il-2 were built through World War II. Stalin credited the Il-2 with winning the war. * http://en.wikipedia.org/wiki/Ground_attack_aircraft