Fighter planes of World War I had an average wingspan of 28 feet, and a ceiling of about 20,000 feet. They were powered with engines of 150 horsepower, their speeds ranged from 100 to 125 miles per hour. Their average weight was 1,500 pounds and they carried enough gasoline for a two hours’ flight and were armed with two .30-caliber machine guns. All of these planes had the habit of shedding parts under stress of battle and more pilots were killed during the war because of defective equipment, lack of parachutes, and inexperience than as a result of enemy action. The long-range heavy bomber also came into being during World War I. Before the conflict was over many farsighted military men visualized it as the most important military weapon produced by the science of flight. Our own General “Billy” Mitchell was one of the first to visualize its possibilities. The British two-engined Handley-Page bomber carried the brunt of heavy bombardment action during the war. It carried a one-thousand-pound bomb load, with its bombs ranging from 15 to 600 pounds each. It had a range of 250 miles and was credited with a great deal of destructive work behind the German lines. At the end of the war a new and larger Handley-Page bomber with a range of 650 miles and a 2-ton bomb load capacity was ready to carry the war far beyond the enemy’s lines. While the Germans relied mainly on their big Zeppelins for long-range bombardment, they also used the big two-engined _Gotha_ bomber for raids on French cities. Whether the airplane had any real effect on the outcome of World War I is questionable. It did, however, set keen-minded military men to thinking in a manner that made the airplane the key weapon of World War II.