1) The first use of airplanes in war was in 1911 during the Italo-Turkish War, but aviation developed considerably during World War 1 as airplanes took on roles like reconnaissance, artillery spotting, and eventually aerial combat.
2) Initially, armies were hesitant about using airplanes as there were only a few hundred fragile, unarmed planes compared to thousands of soldiers. Early pilots primarily served as chauffeurs for officers to gather intelligence.
3) As the war progressed, airplanes embraced weapons like machine guns and became fighters, engaging in deadly dogfights above the trenches. Their roles expanded from reconnaissance to aerial combat as new tactics and technologies evolved.