I think the Air war was the most significant advancement of WWI, before, planes were still brand new, and only used for recon. By the end of the war, there were primitive bomber planes, and also there were fighter planes dog fighting in the sky. The air war added so much to warfare, it basically was a whole new battlefront up in the skies. Planes could now drop bombs on enemies without having to send troops in, they could recon enemy movements without having to send up a balloon, which was slow, and also easy to destroy. What do you think of the air war in World War 1